diff --git a/.mailmap b/.mailmap
index 7c94418..73fd92e 100644
--- a/.mailmap
+++ b/.mailmap
@@ -59,6 +59,7 @@
 David Turner <novalis@novalis.org> <dturner@twopensource.com>
 David Turner <novalis@novalis.org> <dturner@twosigma.com>
 Derrick Stolee <dstolee@microsoft.com> <stolee@gmail.com>
+Derrick Stolee <dstolee@microsoft.com> Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>
 Deskin Miller <deskinm@umich.edu>
 Đoàn Trần Công Danh <congdanhqx@gmail.com> Doan Tran Cong Danh
 Dirk Süsserott <newsletter@dirk.my1.cc>
@@ -109,6 +110,7 @@
 Joachim Berdal Haga <cjhaga@fys.uio.no>
 Joachim Jablon <joachim.jablon@people-doc.com> <ewjoachim@gmail.com>
 Johannes Schindelin <Johannes.Schindelin@gmx.de> <johannes.schindelin@gmx.de>
+Johannes Schindelin <Johannes.Schindelin@gmx.de> Johannes Schindelin via GitGitGadget <gitgitgadget@gmail.com>
 Johannes Sixt <j6t@kdbg.org> <J.Sixt@eudaptics.com>
 Johannes Sixt <j6t@kdbg.org> <j.sixt@viscovery.net>
 Johannes Sixt <j6t@kdbg.org> <johannes.sixt@telecom.at>
@@ -287,6 +289,7 @@
 YONETANI Tomokazu <y0n3t4n1@gmail.com> <qhwt+git@les.ath.cx>
 YONETANI Tomokazu <y0n3t4n1@gmail.com> <y0netan1@dragonflybsd.org>
 YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
+Yi-Jyun Pan <pan93412@gmail.com>
 # the two anonymous contributors are different persons:
 anonymous <linux@horizon.com>
 anonymous <linux@horizon.net>
diff --git a/Documentation/RelNotes/2.25.1.txt b/Documentation/RelNotes/2.25.1.txt
new file mode 100644
index 0000000..cd869b0
--- /dev/null
+++ b/Documentation/RelNotes/2.25.1.txt
@@ -0,0 +1,55 @@
+Git 2.25.1 Release Notes
+========================
+
+Fixes since v2.25
+-----------------
+
+ * "git commit" gives output similar to "git status" when there is
+   nothing to commit, but without honoring the advise.statusHints
+   configuration variable, which has been corrected.
+
+ * has_object_file() said "no" given an object registered to the
+   system via pretend_object_file(), making it inconsistent with
+   read_object_file(), causing lazy fetch to attempt fetching an
+   empty tree from promisor remotes.
+
+ * The code that tries to skip over the entries for the paths in a
+   single directory using the cache-tree was not careful enough
+   against corrupt index file.
+
+ * Complete an update to tutorial that encourages "git switch" over
+   "git checkout" that was done only half-way.
+
+ * Reduce unnecessary round-trip when running "ls-remote" over the
+   stateless RPC mechanism.
+
+ * "git restore --staged" did not correctly update the cache-tree
+   structure, resulting in bogus trees to be written afterwards, which
+   has been corrected.
+
+ * The code recently added to move to the entry beyond the ones in the
+   same directory in the index in the sparse-cone mode did not count
+   the number of entries to skip over incorrectly, which has been
+   corrected.
+
+ * Work around test breakages caused by custom regex engine used in
+   libasan, when address sanitizer is used with more recent versions
+   of gcc and clang.
+
+ * "git fetch --refmap=" option has got a better documentation.
+
+ * Corner case bugs in "git clean" that stems from a (necessarily for
+   performance reasons) awkward calling convention in the directory
+   enumeration API has been corrected.
+
+ * "git grep --no-index" should not get affected by the contents of
+   the .gitmodules file but when "--recurse-submodules" is given or
+   the "submodule.recurse" variable is set, it did.  Now these
+   settings are ignored in the "--no-index" mode.
+
+ * Technical details of the bundle format has been documented.
+
+ * Unhelpful warning messages during documentation build have been
+   squelched.
+
+Also contains various documentation updates, code clean-ups and minor fixups.
diff --git a/Documentation/config/http.txt b/Documentation/config/http.txt
index 5a32f5b..e806033 100644
--- a/Documentation/config/http.txt
+++ b/Documentation/config/http.txt
@@ -71,7 +71,7 @@
 http.version::
 	Use the specified HTTP protocol version when communicating with a server.
 	If you want to force the default. The available and default version depend
-	on libcurl. Actually the possible values of
+	on libcurl. Currently the possible values of
 	this option are:
 
 	- HTTP/2
@@ -84,7 +84,7 @@
 	particular configuration of the crypto library in use. Internally
 	this sets the 'CURLOPT_SSL_VERSION' option; see the libcurl
 	documentation for more details on the format of this option and
-	for the ssl version supported. Actually the possible values of
+	for the ssl version supported. Currently the possible values of
 	this option are:
 
 	- sslv2
@@ -199,6 +199,14 @@
 	Transfer-Encoding: chunked is used to avoid creating a
 	massive pack file locally.  Default is 1 MiB, which is
 	sufficient for most requests.
++
+Note that raising this limit is only effective for disabling chunked
+transfer encoding and therefore should be used only where the remote
+server or a proxy only supports HTTP/1.0 or is noncompliant with the
+HTTP standard.  Raising this is not, in general, an effective solution
+for most push problems, but can increase memory consumption
+significantly since the entire buffer is allocated even for small
+pushes.
 
 http.lowSpeedLimit, http.lowSpeedTime::
 	If the HTTP transfer speed is less than 'http.lowSpeedLimit'
diff --git a/Documentation/config/user.txt b/Documentation/config/user.txt
index 0557cbb..59aec7c 100644
--- a/Documentation/config/user.txt
+++ b/Documentation/config/user.txt
@@ -13,7 +13,12 @@
 	Also, all of these can be overridden by the `GIT_AUTHOR_NAME`,
 	`GIT_AUTHOR_EMAIL`, `GIT_COMMITTER_NAME`,
 	`GIT_COMMITTER_EMAIL` and `EMAIL` environment variables.
-	See linkgit:git-commit-tree[1] for more information.
++
+Note that the `name` forms of these variables conventionally refer to
+some form of a personal name.  See linkgit:git-commit[1] and the
+environment variables section of linkgit:git[1] for more information on
+these settings and the `credential.username` option if you're looking
+for authentication credentials instead.
 
 user.useConfigOnly::
 	Instruct Git to avoid trying to guess defaults for `user.email`
diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index 09faee3..bb31f0c 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -567,13 +567,13 @@
 file:
 +
 ----
-+    return !regexec(regexp, two->ptr, 1, &regmatch, 0);
++    return frotz(nitfol, two->ptr, 1, 0);
 ...
--    hit = !regexec(regexp, mf2.ptr, 1, &regmatch, 0);
+-    hit = frotz(nitfol, mf2.ptr, 1, 0);
 ----
 +
-While `git log -G"regexec\(regexp"` will show this commit, `git log
--S"regexec\(regexp" --pickaxe-regex` will not (because the number of
+While `git log -G"frotz\(nitfol"` will show this commit, `git log
+-S"frotz\(nitfol" --pickaxe-regex` will not (because the number of
 occurrences of that string did not change).
 +
 Unless `--text` is supplied patches of binary files without a textconv
diff --git a/Documentation/fetch-options.txt b/Documentation/fetch-options.txt
index a2f7862..a115a1a 100644
--- a/Documentation/fetch-options.txt
+++ b/Documentation/fetch-options.txt
@@ -139,7 +139,10 @@
 	specified refspec (can be given more than once) to map the
 	refs to remote-tracking branches, instead of the values of
 	`remote.*.fetch` configuration variables for the remote
-	repository.  See section on "Configured Remote-tracking
+	repository.  Providing an empty `<refspec>` to the
+	`--refmap` option causes Git to ignore the configured
+	refspecs and rely entirely on the refspecs supplied as
+	command-line arguments. See section on "Configured Remote-tracking
 	Branches" for details.
 
 -t::
diff --git a/Documentation/git-commit-tree.txt b/Documentation/git-commit-tree.txt
index 4b90b9c..ec15ee8 100644
--- a/Documentation/git-commit-tree.txt
+++ b/Documentation/git-commit-tree.txt
@@ -69,7 +69,6 @@
 	Do not GPG-sign commit, to countermand a `--gpg-sign` option
 	given earlier on the command line.
 
-
 Commit Information
 ------------------
 
@@ -79,26 +78,6 @@
 - author name, email and date
 - committer name and email and the commit time.
 
-While parent object ids are provided on the command line, author and
-committer information is taken from the following environment variables,
-if set:
-
-	GIT_AUTHOR_NAME
-	GIT_AUTHOR_EMAIL
-	GIT_AUTHOR_DATE
-	GIT_COMMITTER_NAME
-	GIT_COMMITTER_EMAIL
-	GIT_COMMITTER_DATE
-
-(nb "<", ">" and "\n"s are stripped)
-
-In case (some of) these environment variables are not set, the information
-is taken from the configuration items user.name and user.email, or, if not
-present, the environment variable EMAIL, or, if that is not set,
-system user name and the hostname used for outgoing mail (taken
-from `/etc/mailname` and falling back to the fully qualified hostname when
-that file does not exist).
-
 A commit comment is read from stdin. If a changelog
 entry is not provided via "<" redirection, 'git commit-tree' will just wait
 for one to be entered and terminated with ^D.
@@ -117,6 +96,7 @@
 SEE ALSO
 --------
 linkgit:git-write-tree[1]
+linkgit:git-commit[1]
 
 GIT
 ---
diff --git a/Documentation/git-commit.txt b/Documentation/git-commit.txt
index ced5a9b..13f6539 100644
--- a/Documentation/git-commit.txt
+++ b/Documentation/git-commit.txt
@@ -367,9 +367,6 @@
 +
 For more details, see the 'pathspec' entry in linkgit:gitglossary[7].
 
-:git-commit: 1
-include::date-formats.txt[]
-
 EXAMPLES
 --------
 When recording your own work, the contents of modified files in
@@ -463,6 +460,43 @@
 should be recorded as a single commit.  In fact, the command
 refuses to run when given pathnames (but see `-i` option).
 
+COMMIT INFORMATION
+------------------
+
+Author and committer information is taken from the following environment
+variables, if set:
+
+	GIT_AUTHOR_NAME
+	GIT_AUTHOR_EMAIL
+	GIT_AUTHOR_DATE
+	GIT_COMMITTER_NAME
+	GIT_COMMITTER_EMAIL
+	GIT_COMMITTER_DATE
+
+(nb "<", ">" and "\n"s are stripped)
+
+The author and committer names are by convention some form of a personal name
+(that is, the name by which other humans refer to you), although Git does not
+enforce or require any particular form. Arbitrary Unicode may be used, subject
+to the constraints listed above. This name has no effect on authentication; for
+that, see the `credential.username` variable in linkgit:git-config[1].
+
+In case (some of) these environment variables are not set, the information
+is taken from the configuration items `user.name` and `user.email`, or, if not
+present, the environment variable EMAIL, or, if that is not set,
+system user name and the hostname used for outgoing mail (taken
+from `/etc/mailname` and falling back to the fully qualified hostname when
+that file does not exist).
+
+The `author.name` and `committer.name` and their corresponding email options
+override `user.name` and `user.email` if set and are overridden themselves by
+the environment variables.
+
+The typical usage is to set just the `user.name` and `user.email` variables;
+the other options are provided for more complex use cases.
+
+:git-commit: 1
+include::date-formats.txt[]
 
 DISCUSSION
 ----------
diff --git a/Documentation/git-filter-branch.txt b/Documentation/git-filter-branch.txt
index a530fef..40ba4aa 100644
--- a/Documentation/git-filter-branch.txt
+++ b/Documentation/git-filter-branch.txt
@@ -467,9 +467,9 @@
 
 * In editing files, git-filter-branch by design checks out each and
   every commit as it existed in the original repo.  If your repo has
-  10\^5 files and 10\^5 commits, but each commit only modifies 5
-  files, then git-filter-branch will make you do 10\^10 modifications,
-  despite only having (at most) 5*10^5 unique blobs.
+  `10^5` files and `10^5` commits, but each commit only modifies five
+  files, then git-filter-branch will make you do `10^10` modifications,
+  despite only having (at most) `5*10^5` unique blobs.
 
 * If you try and cheat and try to make git-filter-branch only work on
   files modified in a commit, then two things happen
diff --git a/Documentation/git-grep.txt b/Documentation/git-grep.txt
index c89fb56..ffc3a6e 100644
--- a/Documentation/git-grep.txt
+++ b/Documentation/git-grep.txt
@@ -96,7 +96,8 @@
 	Recursively search in each submodule that has been initialized and
 	checked out in the repository.  When used in combination with the
 	<tree> option the prefix of all submodule output will be the name of
-	the parent project's <tree> object.
+	the parent project's <tree> object. This option has no effect
+	if `--no-index` is given.
 
 -a::
 --text::
diff --git a/Documentation/git-submodule.txt b/Documentation/git-submodule.txt
index 5232407..218942a 100644
--- a/Documentation/git-submodule.txt
+++ b/Documentation/git-submodule.txt
@@ -229,7 +229,7 @@
 checked out commit for each submodule:
 +
 --------------
-git submodule foreach 'echo $path `git rev-parse HEAD`'
+git submodule foreach 'echo $sm_path `git rev-parse HEAD`'
 --------------
 
 sync [--recursive] [--] [<path>...]::
diff --git a/Documentation/git-update-index.txt b/Documentation/git-update-index.txt
index c7a6271..1489cb0 100644
--- a/Documentation/git-update-index.txt
+++ b/Documentation/git-update-index.txt
@@ -549,6 +549,22 @@
 `core.untrackedCache` configuration variable (see
 linkgit:git-config[1]).
 
+NOTES
+-----
+
+Users often try to use the assume-unchanged and skip-worktree bits
+to tell Git to ignore changes to files that are tracked.  This does not
+work as expected, since Git may still check working tree files against
+the index when performing certain operations.  In general, Git does not
+provide a way to ignore changes to tracked files, so alternate solutions
+are recommended.
+
+For example, if the file you want to change is some sort of config file,
+the repository can include a sample config file that can then be copied
+into the ignored name and modified.  The repository can even include a
+script to treat the sample file as a template, modifying and copying it
+automatically.
+
 SEE ALSO
 --------
 linkgit:git-config[1],
diff --git a/Documentation/git.txt b/Documentation/git.txt
index b1597ac..0093c64 100644
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -482,13 +482,36 @@
 Git Commits
 ~~~~~~~~~~~
 `GIT_AUTHOR_NAME`::
+	The human-readable name used in the author identity when creating commit or
+	tag objects, or when writing reflogs. Overrides the `user.name` and
+	`author.name` configuration settings.
+
 `GIT_AUTHOR_EMAIL`::
+	The email address used in the author identity when creating commit or
+	tag objects, or when writing reflogs. Overrides the `user.email` and
+	`author.email` configuration settings.
+
 `GIT_AUTHOR_DATE`::
+	The date used for the author identity when creating commit or tag objects, or
+	when writing reflogs. See linkgit:git-commit[1] for valid formats.
+
 `GIT_COMMITTER_NAME`::
+	The human-readable name used in the committer identity when creating commit or
+	tag objects, or when writing reflogs. Overrides the `user.name` and
+	`committer.name` configuration settings.
+
 `GIT_COMMITTER_EMAIL`::
+	The email address used in the author identity when creating commit or
+	tag objects, or when writing reflogs. Overrides the `user.email` and
+	`committer.email` configuration settings.
+
 `GIT_COMMITTER_DATE`::
-'EMAIL'::
-	see linkgit:git-commit-tree[1]
+	The date used for the committer identity when creating commit or tag objects, or
+	when writing reflogs. See linkgit:git-commit[1] for valid formats.
+
+`EMAIL`::
+	The email address used in the author and committer identities if no other
+	relevant environment variable or configuration setting has been set.
 
 Git Diffs
 ~~~~~~~~~
diff --git a/Documentation/gitcore-tutorial.txt b/Documentation/gitcore-tutorial.txt
index f880d21..c0b9525 100644
--- a/Documentation/gitcore-tutorial.txt
+++ b/Documentation/gitcore-tutorial.txt
@@ -751,7 +751,7 @@
 ================================================
 If you make the decision to start your new branch at some
 other point in the history than the current `HEAD`, you can do so by
-just telling 'git checkout' what the base of the checkout would be.
+just telling 'git switch' what the base of the checkout would be.
 In other words, if you have an earlier tag or branch, you'd just do
 
 ------------
diff --git a/Documentation/technical/bundle-format.txt b/Documentation/technical/bundle-format.txt
new file mode 100644
index 0000000..0e82815
--- /dev/null
+++ b/Documentation/technical/bundle-format.txt
@@ -0,0 +1,48 @@
+= Git bundle v2 format
+
+The Git bundle format is a format that represents both refs and Git objects.
+
+== Format
+
+We will use ABNF notation to define the Git bundle format. See
+protocol-common.txt for the details.
+
+----
+bundle    = signature *prerequisite *reference LF pack
+signature = "# v2 git bundle" LF
+
+prerequisite = "-" obj-id SP comment LF
+comment      = *CHAR
+reference    = obj-id SP refname LF
+
+pack         = ... ; packfile
+----
+
+== Semantics
+
+A Git bundle consists of three parts.
+
+* "Prerequisites" lists the objects that are NOT included in the bundle and the
+  reader of the bundle MUST already have, in order to use the data in the
+  bundle. The objects stored in the bundle may refer to prerequisite objects and
+  anything reachable from them (e.g. a tree object in the bundle can reference
+  a blob that is reachable from a prerequisite) and/or expressed as a delta
+  against prerequisite objects.
+
+* "References" record the tips of the history graph, iow, what the reader of the
+  bundle CAN "git fetch" from it.
+
+* "Pack" is the pack data stream "git fetch" would send, if you fetch from a
+  repository that has the references recorded in the "References" above into a
+  repository that has references pointing at the objects listed in
+  "Prerequisites" above.
+
+In the bundle format, there can be a comment following a prerequisite obj-id.
+This is a comment and it has no specific meaning. The writer of the bundle MAY
+put any string here. The reader of the bundle MUST ignore the comment.
+
+=== Note on the shallow clone and a Git bundle
+
+Note that the prerequisites does not represent a shallow-clone boundary. The
+semantics of the prerequisites and the shallow-clone boundaries are different,
+and the Git bundle v2 format cannot represent a shallow clone repository.
diff --git a/Documentation/technical/pack-format.txt b/Documentation/technical/pack-format.txt
index cab5bdd..d3a142c 100644
--- a/Documentation/technical/pack-format.txt
+++ b/Documentation/technical/pack-format.txt
@@ -315,10 +315,11 @@
 	    Stores two 4-byte values for every object.
 	    1: The pack-int-id for the pack storing this object.
 	    2: The offset within the pack.
-		If all offsets are less than 2^31, then the large offset chunk
+		If all offsets are less than 2^32, then the large offset chunk
 		will not exist and offsets are stored as in IDX v1.
 		If there is at least one offset value larger than 2^32-1, then
-		the large offset chunk must exist. If the large offset chunk
+		the large offset chunk must exist, and offsets larger than
+		2^31-1 must be stored in it instead. If the large offset chunk
 		exists and the 31st bit is on, then removing that bit reveals
 		the row in the large offsets containing the 8-byte offset of
 		this object.
diff --git a/GIT-VERSION-GEN b/GIT-VERSION-GEN
index 2b7f62b..2a8e709 100755
--- a/GIT-VERSION-GEN
+++ b/GIT-VERSION-GEN
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 GVF=GIT-VERSION-FILE
-DEF_VER=v2.25.0
+DEF_VER=v2.25.1
 
 LF='
 '
diff --git a/Makefile b/Makefile
index 09f98b7..9cd9826 100644
--- a/Makefile
+++ b/Makefile
@@ -1220,6 +1220,9 @@
 ifneq ($(filter leak,$(SANITIZERS)),)
 BASIC_CFLAGS += -DSUPPRESS_ANNOTATED_LEAKS
 endif
+ifneq ($(filter address,$(SANITIZERS)),)
+NO_REGEX = NeededForASAN
+endif
 endif
 
 ifndef sysconfdir
diff --git a/RelNotes b/RelNotes
index 091dd02..c63ee7d 120000
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/2.25.0.txt
\ No newline at end of file
+Documentation/RelNotes/2.25.1.txt
\ No newline at end of file
diff --git a/add-interactive.c b/add-interactive.c
index 6a5048c..143e694 100644
--- a/add-interactive.c
+++ b/add-interactive.c
@@ -326,7 +326,10 @@
 				if (endp == p + sep)
 					to = from + 1;
 				else if (*endp == '-') {
-					to = strtoul(++endp, &endp, 10);
+					if (isdigit(*(++endp)))
+						to = strtoul(endp, &endp, 10);
+					else
+						to = items->items.nr;
 					/* extra characters after the range? */
 					if (endp != p + sep)
 						from = -1;
@@ -913,7 +916,7 @@
 
 	opts->prompt = N_("Patch update");
 	count = list_and_choose(s, files, opts);
-	if (count >= 0) {
+	if (count > 0) {
 		struct argv_array args = ARGV_ARRAY_INIT;
 		struct pathspec ps_selected = { 0 };
 
@@ -954,7 +957,7 @@
 	opts->flags = IMMEDIATE;
 	count = list_and_choose(s, files, opts);
 	opts->flags = 0;
-	if (count >= 0) {
+	if (count > 0) {
 		struct argv_array args = ARGV_ARRAY_INIT;
 
 		argv_array_pushl(&args, "git", "diff", "-p", "--cached",
diff --git a/builtin/checkout.c b/builtin/checkout.c
index b52c490..18ef5fb 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -524,6 +524,8 @@
 	/* Now we are committed to check them out */
 	if (opts->checkout_worktree)
 		errs |= checkout_worktree(opts);
+	else
+		remove_marked_cache_entries(&the_index, 1);
 
 	/*
 	 * Allow updating the index when checking out from the index.
diff --git a/builtin/commit.c b/builtin/commit.c
index aa13323..646e845 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -964,6 +964,7 @@
 	 */
 	if (!committable && whence != FROM_MERGE && !allow_empty &&
 	    !(amend && is_a_merge(current_head))) {
+		s->hints = advice_status_hints;
 		s->display_comment_prefix = old_display_comment_prefix;
 		run_status(stdout, index_file, prefix, 0, s);
 		if (amend)
diff --git a/builtin/grep.c b/builtin/grep.c
index 50ce8d9..ae2d5bb 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -958,6 +958,9 @@
 			/* die the same way as if we did it at the beginning */
 			setup_git_directory();
 	}
+	/* Ignore --recurse-submodules if --no-index is given or implied */
+	if (!use_index)
+		recurse_submodules = 0;
 
 	/*
 	 * skip a -- separator; we know it cannot be
@@ -1115,8 +1118,8 @@
 		}
 	}
 
-	if (recurse_submodules && (!use_index || untracked))
-		die(_("option not supported with --recurse-submodules"));
+	if (recurse_submodules && untracked)
+		die(_("--untracked not supported with --recurse-submodules"));
 
 	if (!show_in_pager && !opt.status_only)
 		setup_pager();
diff --git a/ci/test-documentation.sh b/ci/test-documentation.sh
index b3e76ef..de41888 100755
--- a/ci/test-documentation.sh
+++ b/ci/test-documentation.sh
@@ -7,6 +7,7 @@
 
 filter_log () {
 	sed -e '/^GIT_VERSION = /d' \
+	    -e "/constant Gem::ConfigMap is deprecated/d" \
 	    -e '/^    \* new asciidoc flags$/d' \
 	    -e '/stripped namespace before processing/d' \
 	    -e '/Attributed.*IDs for element/d' \
diff --git a/compat/obstack.h b/compat/obstack.h
index 01e7c81..f90a46d 100644
--- a/compat/obstack.h
+++ b/compat/obstack.h
@@ -135,8 +135,10 @@
    alignment relative to 0.  */
 
 #define __PTR_ALIGN(B, P, A)						    \
-  __BPTR_ALIGN (sizeof (PTR_INT_TYPE) < sizeof (void *) ? (B) : (char *) 0, \
-		P, A)
+  (sizeof (PTR_INT_TYPE) < sizeof(void *) ?                                 \
+   __BPTR_ALIGN((B), (P), (A)) :                                            \
+   (void *)__BPTR_ALIGN((PTR_INT_TYPE)(void *)0, (PTR_INT_TYPE)(P), (A))            \
+  )
 
 #include <string.h>
 
diff --git a/compat/regex/regex.h b/compat/regex/regex.h
index 08a2609..2d34128 100644
--- a/compat/regex/regex.h
+++ b/compat/regex/regex.h
@@ -41,6 +41,11 @@
 extern "C" {
 #endif
 
+#define regcomp git_regcomp
+#define regexec git_regexec
+#define regerror git_regerror
+#define regfree git_regfree
+
 /* The following two types have to be signed and unsigned integer type
    wide enough to hold a value of a pointer.  For most ANSI compilers
    ptrdiff_t and size_t should be likely OK.  Still size of these two
diff --git a/compat/vcbuild/scripts/clink.pl b/compat/vcbuild/scripts/clink.pl
index ec95a3b..d9f71b7 100755
--- a/compat/vcbuild/scripts/clink.pl
+++ b/compat/vcbuild/scripts/clink.pl
@@ -45,9 +45,9 @@
 	} elsif ("$arg" eq "-liconv") {
 		push(@args, "libiconv.lib");
 	} elsif ("$arg" eq "-lcrypto") {
-		push(@args, "libeay32.lib");
+		push(@args, "libcrypto.lib");
 	} elsif ("$arg" eq "-lssl") {
-		push(@args, "ssleay32.lib");
+		push(@args, "libssl.lib");
 	} elsif ("$arg" eq "-lcurl") {
 		my $lib = "";
 		# Newer vcpkg definitions call this libcurl_imp.lib; Do we
diff --git a/contrib/buildsystems/engine.pl b/contrib/buildsystems/engine.pl
index fba8a3f..0709785 100755
--- a/contrib/buildsystems/engine.pl
+++ b/contrib/buildsystems/engine.pl
@@ -343,9 +343,9 @@
         } elsif ("$part" eq "-lz") {
             push(@libs, "zlib.lib");
         } elsif ("$part" eq "-lcrypto") {
-            push(@libs, "libeay32.lib");
+            push(@libs, "libcrypto.lib");
         } elsif ("$part" eq "-lssl") {
-            push(@libs, "ssleay32.lib");
+            push(@libs, "libssl.lib");
         } elsif ("$part" eq "-lcurl") {
             push(@libs, "libcurl.lib");
         } elsif ("$part" eq "-lexpat") {
diff --git a/convert.c b/convert.c
index 797e0bd..2b8549e 100644
--- a/convert.c
+++ b/convert.c
@@ -1940,7 +1940,7 @@
  * the contents cannot be filtered without reading the whole thing
  * in-core.
  *
- * Note that you would be crazy to set CRLF, smuge/clean or ident to a
+ * Note that you would be crazy to set CRLF, smudge/clean or ident to a
  * large binary blob you would want us not to slurp into the memory!
  */
 struct stream_filter *get_stream_filter(const struct index_state *istate,
diff --git a/dir.c b/dir.c
index 7d25522..b460211 100644
--- a/dir.c
+++ b/dir.c
@@ -41,7 +41,8 @@
 	int nr_files;
 	int nr_dirs;
 
-	struct dirent *de;
+	const char *d_name;
+	int d_type;
 	const char *file;
 	struct untracked_cache_dir *ucd;
 };
@@ -50,8 +51,8 @@
 	struct index_state *istate, const char *path, int len,
 	struct untracked_cache_dir *untracked,
 	int check_only, int stop_at_first_file, const struct pathspec *pathspec);
-static int get_dtype(struct dirent *de, struct index_state *istate,
-		     const char *path, int len);
+static int resolve_dtype(int dtype, struct index_state *istate,
+			 const char *path, int len);
 
 int count_slashes(const char *s)
 {
@@ -1215,8 +1216,7 @@
 		int prefix = pattern->nowildcardlen;
 
 		if (pattern->flags & PATTERN_FLAG_MUSTBEDIR) {
-			if (*dtype == DT_UNKNOWN)
-				*dtype = get_dtype(NULL, istate, pathname, pathlen);
+			*dtype = resolve_dtype(*dtype, istate, pathname, pathlen);
 			if (*dtype != DT_DIR)
 				continue;
 		}
@@ -1842,10 +1842,9 @@
 	return DT_UNKNOWN;
 }
 
-static int get_dtype(struct dirent *de, struct index_state *istate,
-		     const char *path, int len)
+static int resolve_dtype(int dtype, struct index_state *istate,
+			 const char *path, int len)
 {
-	int dtype = de ? DTYPE(de) : DT_UNKNOWN;
 	struct stat st;
 
 	if (dtype != DT_UNKNOWN)
@@ -1870,14 +1869,13 @@
 					  struct strbuf *path,
 					  int baselen,
 					  const struct pathspec *pathspec,
-					  int dtype, struct dirent *de)
+					  int dtype)
 {
 	int exclude;
 	int has_path_in_index = !!index_file_exists(istate, path->buf, path->len, ignore_case);
 	enum path_treatment path_treatment;
 
-	if (dtype == DT_UNKNOWN)
-		dtype = get_dtype(de, istate, path->buf, path->len);
+	dtype = resolve_dtype(dtype, istate, path->buf, path->len);
 
 	/* Always exclude indexed files */
 	if (dtype != DT_DIR && has_path_in_index)
@@ -1985,21 +1983,18 @@
 				      int baselen,
 				      const struct pathspec *pathspec)
 {
-	int dtype;
-	struct dirent *de = cdir->de;
-
-	if (!de)
+	if (!cdir->d_name)
 		return treat_path_fast(dir, untracked, cdir, istate, path,
 				       baselen, pathspec);
-	if (is_dot_or_dotdot(de->d_name) || !fspathcmp(de->d_name, ".git"))
+	if (is_dot_or_dotdot(cdir->d_name) || !fspathcmp(cdir->d_name, ".git"))
 		return path_none;
 	strbuf_setlen(path, baselen);
-	strbuf_addstr(path, de->d_name);
+	strbuf_addstr(path, cdir->d_name);
 	if (simplify_away(path->buf, path->len, pathspec))
 		return path_none;
 
-	dtype = DTYPE(de);
-	return treat_one_path(dir, untracked, istate, path, baselen, pathspec, dtype, de);
+	return treat_one_path(dir, untracked, istate, path, baselen, pathspec,
+			      cdir->d_type);
 }
 
 static void add_untracked(struct untracked_cache_dir *dir, const char *name)
@@ -2087,10 +2082,17 @@
 
 static int read_cached_dir(struct cached_dir *cdir)
 {
+	struct dirent *de;
+
 	if (cdir->fdir) {
-		cdir->de = readdir(cdir->fdir);
-		if (!cdir->de)
+		de = readdir(cdir->fdir);
+		if (!de) {
+			cdir->d_name = NULL;
+			cdir->d_type = DT_UNKNOWN;
 			return -1;
+		}
+		cdir->d_name = de->d_name;
+		cdir->d_type = DTYPE(de);
 		return 0;
 	}
 	while (cdir->nr_dirs < cdir->untracked->dirs_nr) {
@@ -2216,7 +2218,7 @@
 		/* recurse into subdir if instructed by treat_path */
 		if ((state == path_recurse) ||
 			((state == path_untracked) &&
-			 (get_dtype(cdir.de, istate, path.buf, path.len) == DT_DIR) &&
+			 (resolve_dtype(cdir.d_type, istate, path.buf, path.len) == DT_DIR) &&
 			 ((dir->flags & DIR_SHOW_IGNORED_TOO) ||
 			  (pathspec &&
 			   do_match_pathspec(istate, pathspec, path.buf, path.len,
@@ -2308,16 +2310,16 @@
 	 * WARNING WARNING WARNING:
 	 *
 	 * Any updates to the traversal logic here may need corresponding
-	 * updates in treat_leading_path().  See the commit message for the
-	 * commit adding this warning as well as the commit preceding it
-	 * for details.
+	 * updates in read_directory_recursive().  See 777b420347 (dir:
+	 * synchronize treat_leading_path() and read_directory_recursive(),
+	 * 2019-12-19) and its parent commit for details.
 	 */
 
 	struct strbuf sb = STRBUF_INIT;
+	struct strbuf subdir = STRBUF_INIT;
 	int prevlen, baselen;
 	const char *cp;
 	struct cached_dir cdir;
-	struct dirent *de;
 	enum path_treatment state = path_none;
 
 	/*
@@ -2342,22 +2344,8 @@
 	if (!len)
 		return 1;
 
-	/*
-	 * We need a manufactured dirent with sufficient space to store a
-	 * leading directory component of path in its d_name.  Here, we
-	 * assume that the dirent's d_name is either declared as
-	 *    char d_name[BIG_ENOUGH]
-	 * or that it is declared at the end of the struct as
-	 *    char d_name[]
-	 * For either case, padding with len+1 bytes at the end will ensure
-	 * sufficient storage space.
-	 */
-	de = xcalloc(1, st_add3(sizeof(struct dirent), len, 1));
 	memset(&cdir, 0, sizeof(cdir));
-	cdir.de = de;
-#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
-	de->d_type = DT_DIR;
-#endif
+	cdir.d_type = DT_DIR;
 	baselen = 0;
 	prevlen = 0;
 	while (1) {
@@ -2374,15 +2362,20 @@
 			break;
 		strbuf_reset(&sb);
 		strbuf_add(&sb, path, prevlen);
-		memcpy(de->d_name, path+prevlen, baselen-prevlen);
-		de->d_name[baselen-prevlen] = '\0';
+		strbuf_reset(&subdir);
+		strbuf_add(&subdir, path+prevlen, baselen-prevlen);
+		cdir.d_name = subdir.buf;
 		state = treat_path(dir, NULL, &cdir, istate, &sb, prevlen,
 				    pathspec);
 		if (state == path_untracked &&
-		    get_dtype(cdir.de, istate, sb.buf, sb.len) == DT_DIR &&
+		    resolve_dtype(cdir.d_type, istate, sb.buf, sb.len) == DT_DIR &&
 		    (dir->flags & DIR_SHOW_IGNORED_TOO ||
 		     do_match_pathspec(istate, pathspec, sb.buf, sb.len,
 				       baselen, NULL, DO_MATCH_LEADING_PATHSPEC) == MATCHED_RECURSIVELY_LEADING_PATHSPEC)) {
+			if (!match_pathspec(istate, pathspec, sb.buf, sb.len,
+					    0 /* prefix */, NULL,
+					    0 /* do NOT special case dirs */))
+				state = path_none;
 			add_path_to_appropriate_result_list(dir, NULL, &cdir,
 							    istate,
 							    &sb, baselen,
@@ -2399,7 +2392,7 @@
 					    &sb, baselen, pathspec,
 					    state);
 
-	free(de);
+	strbuf_release(&subdir);
 	strbuf_release(&sb);
 	return state == path_recurse;
 }
diff --git a/merge-recursive.c b/merge-recursive.c
index 10dca56..aee1769 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -1712,6 +1712,14 @@
 	return new_path;
 }
 
+/*
+ * Toggle the stage number between "ours" and "theirs" (2 and 3).
+ */
+static inline int flip_stage(int stage)
+{
+	return (2 + 3) - stage;
+}
+
 static int handle_rename_rename_1to2(struct merge_options *opt,
 				     struct rename_conflict_info *ci)
 {
@@ -1756,14 +1764,14 @@
 		 * such cases, we should keep the added file around,
 		 * resolving the conflict at that path in its favor.
 		 */
-		add = &ci->ren1->dst_entry->stages[2 ^ 1];
+		add = &ci->ren1->dst_entry->stages[flip_stage(2)];
 		if (is_valid(add)) {
 			if (update_file(opt, 0, add, a->path))
 				return -1;
 		}
 		else
 			remove_file_from_index(opt->repo->index, a->path);
-		add = &ci->ren2->dst_entry->stages[3 ^ 1];
+		add = &ci->ren2->dst_entry->stages[flip_stage(3)];
 		if (is_valid(add)) {
 			if (update_file(opt, 0, add, b->path))
 				return -1;
@@ -1776,7 +1784,7 @@
 		 * rename/add collision.  If not, we can write the file out
 		 * to the specified location.
 		 */
-		add = &ci->ren1->dst_entry->stages[2 ^ 1];
+		add = &ci->ren1->dst_entry->stages[flip_stage(2)];
 		if (is_valid(add)) {
 			add->path = mfi.blob.path = a->path;
 			if (handle_file_collision(opt, a->path,
@@ -1797,7 +1805,7 @@
 				return -1;
 		}
 
-		add = &ci->ren2->dst_entry->stages[3 ^ 1];
+		add = &ci->ren2->dst_entry->stages[flip_stage(3)];
 		if (is_valid(add)) {
 			add->path = mfi.blob.path = b->path;
 			if (handle_file_collision(opt, b->path,
@@ -1846,7 +1854,7 @@
 	path_side_1_desc = xstrfmt("version of %s from %s", path, a->path);
 	path_side_2_desc = xstrfmt("version of %s from %s", path, b->path);
 	ostage1 = ci->ren1->branch == opt->branch1 ? 3 : 2;
-	ostage2 = ostage1 ^ 1;
+	ostage2 = flip_stage(ostage1);
 	ci->ren1->src_entry->stages[ostage1].path = a->path;
 	ci->ren2->src_entry->stages[ostage2].path = b->path;
 	if (merge_mode_and_contents(opt, a, c1,
diff --git a/object-store.h b/object-store.h
index 55ee639..61b8b13 100644
--- a/object-store.h
+++ b/object-store.h
@@ -292,8 +292,6 @@
 #define OBJECT_INFO_LOOKUP_REPLACE 1
 /* Allow reading from a loose object file of unknown/bogus type */
 #define OBJECT_INFO_ALLOW_UNKNOWN_TYPE 2
-/* Do not check cached storage */
-#define OBJECT_INFO_SKIP_CACHED 4
 /* Do not retry packed storage after checking packed and loose storage */
 #define OBJECT_INFO_QUICK 8
 /* Do not check loose object */
diff --git a/parse-options.c b/parse-options.c
index 60fae3a..c278aff 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -420,7 +420,7 @@
 		return;
 
 	if (starts_with(arg, "no-")) {
-		error(_("did you mean `--%s` (with two dashes ?)"), arg);
+		error(_("did you mean `--%s` (with two dashes)?"), arg);
 		exit(129);
 	}
 
@@ -428,7 +428,7 @@
 		if (!options->long_name)
 			continue;
 		if (starts_with(options->long_name, arg)) {
-			error(_("did you mean `--%s` (with two dashes ?)"), arg);
+			error(_("did you mean `--%s` (with two dashes)?"), arg);
 			exit(129);
 		}
 	}
diff --git a/pathspec.c b/pathspec.c
index 128f27f..8243e06 100644
--- a/pathspec.c
+++ b/pathspec.c
@@ -438,8 +438,13 @@
 	} else {
 		match = prefix_path_gently(prefix, prefixlen,
 					   &prefixlen, copyfrom);
-		if (!match)
-			die(_("%s: '%s' is outside repository"), elt, copyfrom);
+		if (!match) {
+			const char *hint_path = get_git_work_tree();
+			if (!hint_path)
+				hint_path = get_git_dir();
+			die(_("%s: '%s' is outside repository at '%s'"), elt,
+			    copyfrom, absolute_path(hint_path));
+		}
 	}
 
 	item->match = match;
diff --git a/run-command.c b/run-command.c
index 9942f12..f5e1149 100644
--- a/run-command.c
+++ b/run-command.c
@@ -213,8 +213,9 @@
 static int exists_in_PATH(const char *file)
 {
 	char *r = locate_in_PATH(file);
+	int found = r != NULL;
 	free(r);
-	return r != NULL;
+	return found;
 }
 
 int sane_execvp(const char *file, char * const argv[])
diff --git a/sequencer.c b/sequencer.c
index 5f69b47..df6d18f 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -588,7 +588,7 @@
 	struct merge_options o;
 	struct tree *next_tree, *base_tree, *head_tree;
 	int clean;
-	char **xopt;
+	int i;
 	struct lock_file index_lock = LOCK_INIT;
 
 	if (repo_hold_locked_index(r, &index_lock, LOCK_REPORT_ON_ERROR) < 0)
@@ -608,8 +608,8 @@
 	next_tree = next ? get_commit_tree(next) : empty_tree(r);
 	base_tree = base ? get_commit_tree(base) : empty_tree(r);
 
-	for (xopt = opts->xopts; xopt != opts->xopts + opts->xopts_nr; xopt++)
-		parse_merge_opt(&o, *xopt);
+	for (i = 0; i < opts->xopts_nr; i++)
+		parse_merge_opt(&o, opts->xopts[i]);
 
 	clean = merge_trees(&o,
 			    head_tree,
diff --git a/setup.c b/setup.c
index e2a479a..f489728 100644
--- a/setup.c
+++ b/setup.c
@@ -120,8 +120,13 @@
 char *prefix_path(const char *prefix, int len, const char *path)
 {
 	char *r = prefix_path_gently(prefix, len, NULL, path);
-	if (!r)
-		die(_("'%s' is outside repository"), path);
+	if (!r) {
+		const char *hint_path = get_git_work_tree();
+		if (!hint_path)
+			hint_path = get_git_dir();
+		die(_("'%s' is outside repository at '%s'"), path,
+		    absolute_path(hint_path));
+	}
 	return r;
 }
 
diff --git a/sha1-file.c b/sha1-file.c
index 188de57..03ae9ae 100644
--- a/sha1-file.c
+++ b/sha1-file.c
@@ -1417,6 +1417,7 @@
 			     struct object_info *oi, unsigned flags)
 {
 	static struct object_info blank_oi = OBJECT_INFO_INIT;
+	struct cached_object *co;
 	struct pack_entry e;
 	int rtype;
 	const struct object_id *real = oid;
@@ -1431,24 +1432,22 @@
 	if (!oi)
 		oi = &blank_oi;
 
-	if (!(flags & OBJECT_INFO_SKIP_CACHED)) {
-		struct cached_object *co = find_cached_object(real);
-		if (co) {
-			if (oi->typep)
-				*(oi->typep) = co->type;
-			if (oi->sizep)
-				*(oi->sizep) = co->size;
-			if (oi->disk_sizep)
-				*(oi->disk_sizep) = 0;
-			if (oi->delta_base_sha1)
-				hashclr(oi->delta_base_sha1);
-			if (oi->type_name)
-				strbuf_addstr(oi->type_name, type_name(co->type));
-			if (oi->contentp)
-				*oi->contentp = xmemdupz(co->buf, co->size);
-			oi->whence = OI_CACHED;
-			return 0;
-		}
+	co = find_cached_object(real);
+	if (co) {
+		if (oi->typep)
+			*(oi->typep) = co->type;
+		if (oi->sizep)
+			*(oi->sizep) = co->size;
+		if (oi->disk_sizep)
+			*(oi->disk_sizep) = 0;
+		if (oi->delta_base_sha1)
+			hashclr(oi->delta_base_sha1);
+		if (oi->type_name)
+			strbuf_addstr(oi->type_name, type_name(co->type));
+		if (oi->contentp)
+			*oi->contentp = xmemdupz(co->buf, co->size);
+		oi->whence = OI_CACHED;
+		return 0;
 	}
 
 	while (1) {
@@ -1932,8 +1931,7 @@
 {
 	if (!startup_info->have_repository)
 		return 0;
-	return oid_object_info_extended(r, oid, NULL,
-					flags | OBJECT_INFO_SKIP_CACHED) >= 0;
+	return oid_object_info_extended(r, oid, NULL, flags) >= 0;
 }
 
 int repo_has_object_file(struct repository *r,
diff --git a/string-list.h b/string-list.h
index 7bb0ad0..6c5d274 100644
--- a/string-list.h
+++ b/string-list.h
@@ -4,7 +4,8 @@
 /**
  * The string_list API offers a data structure and functions to handle
  * sorted and unsorted arrays of strings.  A "sorted" list is one whose
- * entries are sorted by string value in `strcmp()` order.
+ * entries are sorted by string value in the order specified by the `cmp`
+ * member (`strcmp()` by default).
  *
  * The caller:
  *
@@ -209,7 +210,8 @@
 struct string_list_item *string_list_append_nodup(struct string_list *list, char *string);
 
 /**
- * Sort the list's entries by string value in `strcmp()` order.
+ * Sort the list's entries by string value in order specified by list->cmp
+ * (strcmp() if list->cmp is NULL).
  */
 void string_list_sort(struct string_list *list);
 
diff --git a/submodule.c b/submodule.c
index 9da7181..9f4c4c0 100644
--- a/submodule.c
+++ b/submodule.c
@@ -82,7 +82,7 @@
 	if ((pos >= 0) && (pos < istate->cache_nr)) {
 		struct stat st;
 		if (lstat(GITMODULES_FILE, &st) == 0 &&
-		    ie_match_stat(istate, istate->cache[pos], &st, 0) & DATA_CHANGED)
+		    ie_modified(istate, istate->cache[pos], &st, 0) & DATA_CHANGED)
 			return 0;
 	}
 
@@ -431,7 +431,7 @@
 	else if (!strcmp(arg, "dirty"))
 		diffopt->flags.ignore_dirty_submodules = 1;
 	else if (strcmp(arg, "none"))
-		die("bad --ignore-submodules argument: %s", arg);
+		die(_("bad --ignore-submodules argument: %s"), arg);
 	/*
 	 * Please update _git_status() in git-completion.bash when you
 	 * add new options
@@ -812,9 +812,9 @@
 				submodule = submodule_from_name(me->repo,
 								commit_oid, name);
 			if (submodule) {
-				warning("Submodule in commit %s at path: "
+				warning(_("Submodule in commit %s at path: "
 					"'%s' collides with a submodule named "
-					"the same. Skipping it.",
+					"the same. Skipping it."),
 					oid_to_hex(commit_oid), p->two->path);
 				name = NULL;
 			}
@@ -844,7 +844,7 @@
 	repo_init_revisions(r, &rev, NULL);
 	setup_revisions(argv->argc, argv->argv, &rev, NULL);
 	if (prepare_revision_walk(&rev))
-		die("revision walk setup failed");
+		die(_("revision walk setup failed"));
 
 	while ((commit = get_revision(&rev))) {
 		struct rev_info diff_rev;
@@ -992,7 +992,7 @@
 		cp.out = -1;
 		cp.dir = path;
 		if (start_command(&cp))
-			die("Could not run 'git rev-list <commits> --not --remotes -n 1' command in submodule %s",
+			die(_("Could not run 'git rev-list <commits> --not --remotes -n 1' command in submodule %s"),
 					path);
 		if (strbuf_read(&buf, cp.out, the_hash_algo->hexsz + 1))
 			needs_pushing = 1;
@@ -1115,7 +1115,7 @@
 	 * child process.
 	 */
 	if (run_command(&cp))
-		die("process for submodule '%s' failed", path);
+		die(_("process for submodule '%s' failed"), path);
 }
 
 int push_unpushed_submodules(struct repository *r,
@@ -1155,10 +1155,10 @@
 	/* Actually push the submodules */
 	for (i = 0; i < needs_pushing.nr; i++) {
 		const char *path = needs_pushing.items[i].string;
-		fprintf(stderr, "Pushing submodule '%s'\n", path);
+		fprintf(stderr, _("Pushing submodule '%s'\n"), path);
 		if (!push_submodule(path, remote, rs,
 				    push_options, dry_run)) {
-			fprintf(stderr, "Unable to push submodule '%s'\n", path);
+			fprintf(stderr, _("Unable to push submodule '%s'\n"), path);
 			ret = 0;
 		}
 	}
@@ -1448,7 +1448,7 @@
 			prepare_submodule_repo_env_in_gitdir(&cp->env_array);
 			cp->git_cmd = 1;
 			if (!spf->quiet)
-				strbuf_addf(err, "Fetching submodule %s%s\n",
+				strbuf_addf(err, _("Fetching submodule %s%s\n"),
 					    spf->prefix, ce->name);
 			argv_array_init(&cp->args);
 			argv_array_pushv(&cp->args, spf->args.argv);
@@ -1478,7 +1478,7 @@
 			    !is_empty_dir(ce->name)) {
 				spf->result = 1;
 				strbuf_addf(err,
-					    _("Could not access submodule '%s'"),
+					    _("Could not access submodule '%s'\n"),
 					    ce->name);
 			}
 		}
@@ -1610,7 +1610,7 @@
 		goto out;
 
 	if (repo_read_index(r) < 0)
-		die("index file corrupt");
+		die(_("index file corrupt"));
 
 	argv_array_push(&spf.args, "fetch");
 	for (i = 0; i < options->argc; i++)
@@ -1665,7 +1665,7 @@
 	cp.out = -1;
 	cp.dir = path;
 	if (start_command(&cp))
-		die("Could not run 'git status --porcelain=2' in submodule %s", path);
+		die(_("Could not run 'git status --porcelain=2' in submodule %s"), path);
 
 	fp = xfdopen(cp.out, "r");
 	while (strbuf_getwholeline(&buf, fp, '\n') != EOF) {
@@ -1706,7 +1706,7 @@
 	fclose(fp);
 
 	if (finish_command(&cp) && !ignore_cp_exit_code)
-		die("'git status --porcelain=2' failed in submodule %s", path);
+		die(_("'git status --porcelain=2' failed in submodule %s"), path);
 
 	strbuf_release(&buf);
 	return dirty_submodule;
@@ -1811,7 +1811,7 @@
 void submodule_unset_core_worktree(const struct submodule *sub)
 {
 	char *config_path = xstrfmt("%s/modules/%s/config",
-				    get_git_common_dir(), sub->name);
+				    get_git_dir(), sub->name);
 
 	if (git_config_set_in_file_gently(config_path, "core.worktree", NULL))
 		warning(_("Could not unset core.worktree setting in submodule '%s'"),
@@ -1841,7 +1841,7 @@
 	cp.no_stdout = 1;
 	cp.dir = sub->path;
 	if (start_command(&cp))
-		die("could not recurse into submodule '%s'", sub->path);
+		die(_("could not recurse into submodule '%s'"), sub->path);
 
 	return finish_command(&cp);
 }
@@ -1862,7 +1862,7 @@
 	argv_array_push(&cp.args, empty_tree_oid_hex());
 
 	if (run_command(&cp))
-		die("could not reset submodule index");
+		die(_("could not reset submodule index"));
 }
 
 /**
@@ -1914,7 +1914,7 @@
 					ABSORB_GITDIR_RECURSE_SUBMODULES);
 		} else {
 			char *gitdir = xstrfmt("%s/modules/%s",
-				    get_git_common_dir(), sub->name);
+				    get_git_dir(), sub->name);
 			connect_work_tree_and_git_dir(path, gitdir, 0);
 			free(gitdir);
 
@@ -1924,7 +1924,7 @@
 
 		if (old_head && (flags & SUBMODULE_MOVE_HEAD_FORCE)) {
 			char *gitdir = xstrfmt("%s/modules/%s",
-				    get_git_common_dir(), sub->name);
+				    get_git_dir(), sub->name);
 			connect_work_tree_and_git_dir(path, gitdir, 1);
 			free(gitdir);
 		}
diff --git a/t/t0040-parse-options.sh b/t/t0040-parse-options.sh
index 705a136..9d7c7fd 100755
--- a/t/t0040-parse-options.sh
+++ b/t/t0040-parse-options.sh
@@ -242,7 +242,7 @@
 '
 
 cat >typo.err <<\EOF
-error: did you mean `--boolean` (with two dashes ?)
+error: did you mean `--boolean` (with two dashes)?
 EOF
 
 test_expect_success 'detect possible typos' '
@@ -252,7 +252,7 @@
 '
 
 cat >typo.err <<\EOF
-error: did you mean `--ambiguous` (with two dashes ?)
+error: did you mean `--ambiguous` (with two dashes)?
 EOF
 
 test_expect_success 'detect possible typos' '
diff --git a/t/t2070-restore.sh b/t/t2070-restore.sh
index 21c3f84..076d0df 100755
--- a/t/t2070-restore.sh
+++ b/t/t2070-restore.sh
@@ -106,4 +106,21 @@
 	git diff --cached --exit-code
 '
 
+test_expect_success 'restore --staged invalidates cache tree for deletions' '
+	test_when_finished git reset --hard &&
+	>new1 &&
+	>new2 &&
+	git add new1 new2 &&
+
+	# It is important to commit and then reset here, so that the index
+	# contains a valid cache-tree for the "both" tree.
+	git commit -m both &&
+	git reset --soft HEAD^ &&
+
+	git restore --staged new1 &&
+	git commit -m "just new2" &&
+	git rev-parse HEAD:new2 &&
+	test_must_fail git rev-parse HEAD:new1
+'
+
 test_done
diff --git a/t/t2405-worktree-submodule.sh b/t/t2405-worktree-submodule.sh
new file mode 100755
index 0000000..e1b2bfd
--- /dev/null
+++ b/t/t2405-worktree-submodule.sh
@@ -0,0 +1,90 @@
+#!/bin/sh
+
+test_description='Combination of submodules and multiple worktrees'
+
+. ./test-lib.sh
+
+base_path=$(pwd -P)
+
+test_expect_success 'setup: create origin repos'  '
+	git init origin/sub &&
+	test_commit -C origin/sub file1 &&
+	git init origin/main &&
+	test_commit -C origin/main first &&
+	git -C origin/main submodule add ../sub &&
+	git -C origin/main commit -m "add sub" &&
+	test_commit -C origin/sub "file1 updated" file1 file1updated file1updated &&
+	git -C origin/main/sub pull &&
+	git -C origin/main add sub &&
+	git -C origin/main commit -m "sub updated"
+'
+
+test_expect_success 'setup: clone superproject to create main worktree' '
+	git clone --recursive "$base_path/origin/main" main
+'
+
+rev1_hash_main=$(git --git-dir=origin/main/.git show --pretty=format:%h -q "HEAD~1")
+rev1_hash_sub=$(git --git-dir=origin/sub/.git show --pretty=format:%h -q "HEAD~1")
+
+test_expect_success 'add superproject worktree' '
+	git -C main worktree add "$base_path/worktree" "$rev1_hash_main"
+'
+
+test_expect_failure 'submodule is checked out just after worktree add' '
+	git -C worktree diff --submodule master"^!" >out &&
+	grep "file1 updated" out
+'
+
+test_expect_success 'add superproject worktree and initialize submodules' '
+	git -C main worktree add "$base_path/worktree-submodule-update" "$rev1_hash_main" &&
+	git -C worktree-submodule-update submodule update
+'
+
+test_expect_success 'submodule is checked out just after submodule update in linked worktree' '
+	git -C worktree-submodule-update diff --submodule master"^!" >out &&
+	grep "file1 updated" out
+'
+
+test_expect_success 'add superproject worktree and manually add submodule worktree' '
+	git -C main worktree add "$base_path/linked_submodule" "$rev1_hash_main" &&
+	git -C main/sub worktree add "$base_path/linked_submodule/sub" "$rev1_hash_sub"
+'
+
+test_expect_success 'submodule is checked out after manually adding submodule worktree' '
+	git -C linked_submodule diff --submodule master"^!" >out &&
+	grep "file1 updated" out
+'
+
+test_expect_success 'checkout --recurse-submodules uses $GIT_DIR for submodules in a linked worktree' '
+	git -C main worktree add "$base_path/checkout-recurse" --detach  &&
+	git -C checkout-recurse submodule update --init &&
+	echo "gitdir: ../../main/.git/worktrees/checkout-recurse/modules/sub" >expect-gitfile &&
+	cat checkout-recurse/sub/.git >actual-gitfile &&
+	test_cmp expect-gitfile actual-gitfile &&
+	git -C main/sub rev-parse HEAD >expect-head-main &&
+	git -C checkout-recurse checkout --recurse-submodules HEAD~1 &&
+	cat checkout-recurse/sub/.git >actual-gitfile &&
+	git -C main/sub rev-parse HEAD >actual-head-main &&
+	test_cmp expect-gitfile actual-gitfile &&
+	test_cmp expect-head-main actual-head-main
+'
+
+test_expect_success 'core.worktree is removed in $GIT_DIR/modules/<name>/config, not in $GIT_COMMON_DIR/modules/<name>/config' '
+	echo "../../../sub" >expect-main &&
+	git -C main/sub config --get core.worktree >actual-main &&
+	test_cmp expect-main actual-main &&
+	echo "../../../../../../checkout-recurse/sub" >expect-linked &&
+	git -C checkout-recurse/sub config --get core.worktree >actual-linked &&
+	test_cmp expect-linked actual-linked &&
+	git -C checkout-recurse checkout --recurse-submodules first &&
+	test_expect_code 1 git -C main/.git/worktrees/checkout-recurse/modules/sub config --get core.worktree >linked-config &&
+	test_must_be_empty linked-config &&
+	git -C main/sub config --get core.worktree >actual-main &&
+	test_cmp expect-main actual-main
+'
+
+test_expect_success 'unsetting core.worktree does not prevent running commands directly against the submodule repository' '
+	git -C main/.git/worktrees/checkout-recurse/modules/sub log
+'
+
+test_done
diff --git a/t/t3600-rm.sh b/t/t3600-rm.sh
index 0ea858d..f2c0168 100755
--- a/t/t3600-rm.sh
+++ b/t/t3600-rm.sh
@@ -425,6 +425,13 @@
 	git status -s -uno >actual &&
 	test_cmp expect actual
 '
+test_expect_success 'rm will not error out on .gitmodules file with zero stat data' '
+	git reset --hard &&
+	git submodule update &&
+	git read-tree HEAD &&
+	git rm submod &&
+	test_path_is_missing submod
+'
 
 test_expect_success 'rm issues a warning when section is not found in .gitmodules' '
 	git reset --hard &&
diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index 12ee321..2182b1c 100755
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -68,6 +68,15 @@
 	! grep . output
 '
 
+test_expect_success 'add untracked (multiple)' '
+	test_when_finished "git reset && rm [1-9]" &&
+	touch $(test_seq 9) &&
+	test_write_lines a "2-5 8-" | git add -i -- [1-9] &&
+	test_write_lines 2 3 4 5 8 9 >expected &&
+	git ls-files [1-9] >output &&
+	test_cmp expected output
+'
+
 test_expect_success 'setup (commit)' '
 	echo baseline >file &&
 	git add file &&
diff --git a/t/t4018-diff-funcname.sh b/t/t4018-diff-funcname.sh
index c0f4839..02255a0 100755
--- a/t/t4018-diff-funcname.sh
+++ b/t/t4018-diff-funcname.sh
@@ -106,7 +106,6 @@
 		result=success
 	fi
 	test_expect_$result "hunk header: $i" "
-		test_when_finished 'cat actual' &&	# for debugging only
 		git diff -U1 $i >actual &&
 		grep '@@ .* @@.*RIGHT' actual
 	"
diff --git a/t/t5510-fetch.sh b/t/t5510-fetch.sh
index 4b60282..5f8f1c2 100755
--- a/t/t5510-fetch.sh
+++ b/t/t5510-fetch.sh
@@ -174,6 +174,30 @@
 	git rev-parse sometag
 '
 
+test_expect_success '--refmap="" ignores configured refspec' '
+	cd "$TRASH_DIRECTORY" &&
+	git clone "$D" remote-refs &&
+	git -C remote-refs rev-parse remotes/origin/master >old &&
+	git -C remote-refs update-ref refs/remotes/origin/master master~1 &&
+	git -C remote-refs rev-parse remotes/origin/master >new &&
+	git -C remote-refs fetch --refmap= origin "+refs/heads/*:refs/hidden/origin/*" &&
+	git -C remote-refs rev-parse remotes/origin/master >actual &&
+	test_cmp new actual &&
+	git -C remote-refs fetch origin &&
+	git -C remote-refs rev-parse remotes/origin/master >actual &&
+	test_cmp old actual
+'
+
+test_expect_success '--refmap="" and --prune' '
+	git -C remote-refs update-ref refs/remotes/origin/foo/otherbranch master &&
+	git -C remote-refs update-ref refs/hidden/foo/otherbranch master &&
+	git -C remote-refs fetch --prune --refmap="" origin +refs/heads/*:refs/hidden/* &&
+	git -C remote-refs rev-parse remotes/origin/foo/otherbranch &&
+	test_must_fail git -C remote-refs rev-parse refs/hidden/foo/otherbranch &&
+	git -C remote-refs fetch --prune origin &&
+	test_must_fail git -C remote-refs rev-parse remotes/origin/foo/otherbranch
+'
+
 test_expect_success 'fetch tags when there is no tags' '
 
     cd "$D" &&
diff --git a/t/t5616-partial-clone.sh b/t/t5616-partial-clone.sh
index fea56cd..9a9178f 100755
--- a/t/t5616-partial-clone.sh
+++ b/t/t5616-partial-clone.sh
@@ -309,26 +309,36 @@
 
 	printf "line %d\n" $(test_seq 1 100) >big-blob.txt &&
 
-	# Create a server with 2 commits: a commit with a big blob and a child
+	# Create a server with 2 commits: a commit with a big tree and a child
 	# commit with an incremental change. Also, create a partial clone
 	# client that only contains the first commit.
 	git init server &&
 	git -C server config --local uploadpack.allowfilter 1 &&
-	cp big-blob.txt server &&
-	git -C server add big-blob.txt &&
+	for i in $(test_seq 1 100)
+	do
+		echo "make the tree big" >server/file$i &&
+		git -C server add file$i
+	done &&
 	git -C server commit -m "initial" &&
 	git clone --bare --filter=tree:0 "file://$(pwd)/server" client &&
-	echo another line >>server/big-blob.txt &&
-	git -C server commit -am "append line to big blob" &&
+	echo another line >>server/file1 &&
+	git -C server commit -am "incremental change" &&
 
-	# Create a promisor remote that only contains the blob from the first
-	# commit, and set it as the promisor remote of client. Thus, whenever
-	# the client lazy fetches, the lazy fetch will succeed only if it is
-	# for this blob.
+	# Create a promisor remote that only contains the tree and blob from
+	# the first commit.
 	git init promisor-remote &&
+	git -C server config --local uploadpack.allowanysha1inwant 1 &&
+	TREE_HASH=$(git -C server rev-parse HEAD~1^{tree}) &&
+	git -C promisor-remote fetch --keep "file://$(pwd)/server" "$TREE_HASH" &&
+	git -C promisor-remote count-objects -v >object-count &&
+	test_i18ngrep "count: 0" object-count &&
+	test_i18ngrep "in-pack: 2" object-count &&
+
+	# Set it as the promisor remote of client. Thus, whenever
+	# the client lazy fetches, the lazy fetch will succeed only if it is
+	# for this tree or blob.
 	test_commit -C promisor-remote one && # so that ref advertisement is not empty
 	git -C promisor-remote config --local uploadpack.allowanysha1inwant 1 &&
-	git -C promisor-remote hash-object -w --stdin <big-blob.txt &&
 	git -C client remote set-url origin "file://$(pwd)/promisor-remote"
 }
 
@@ -341,14 +351,14 @@
 	setup_triangle &&
 
 	# Exercise to make sure it works. Git will not fetch anything from the
-	# promisor remote other than for the big blob (because it needs to
+	# promisor remote other than for the big tree (because it needs to
 	# resolve the delta).
 	GIT_TRACE_PACKET="$(pwd)/trace" git -C client \
 		fetch "file://$(pwd)/server" master &&
 
 	# Verify the assumption that the client needed to fetch the delta base
 	# to resolve the delta.
-	git hash-object big-blob.txt >hash &&
+	git -C server rev-parse HEAD~1^{tree} >hash &&
 	grep "want $(cat hash)" trace
 '
 
@@ -370,7 +380,7 @@
 
 	# Verify the assumption that the client needed to fetch the delta base
 	# to resolve the delta.
-	git hash-object big-blob.txt >hash &&
+	git -C server rev-parse HEAD~1^{tree} >hash &&
 	grep "want $(cat hash)" trace
 '
 
diff --git a/t/t5702-protocol-v2.sh b/t/t5702-protocol-v2.sh
index e73067d..7fd7102 100755
--- a/t/t5702-protocol-v2.sh
+++ b/t/t5702-protocol-v2.sh
@@ -665,6 +665,18 @@
 	test_cmp expect actual
 '
 
+test_expect_success 'ls-remote with v2 http sends only one POST' '
+	test_when_finished "rm -f log" &&
+
+	git ls-remote "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" >expect &&
+	GIT_TRACE_CURL="$(pwd)/log" git -c protocol.version=2 \
+		ls-remote "$HTTPD_URL/smart/http_parent" >actual &&
+	test_cmp expect actual &&
+
+	grep "Send header: POST" log >posts &&
+	test_line_count = 1 posts
+'
+
 test_expect_success 'push with http:// and a config of v2 does not request v2' '
 	test_when_finished "rm -f log" &&
 	# Till v2 for push is designed, make sure that if a client has
diff --git a/t/t6136-pathspec-in-bare.sh b/t/t6136-pathspec-in-bare.sh
new file mode 100755
index 0000000..b117251
--- /dev/null
+++ b/t/t6136-pathspec-in-bare.sh
@@ -0,0 +1,38 @@
+#!/bin/sh
+
+test_description='diagnosing out-of-scope pathspec'
+
+. ./test-lib.sh
+
+test_expect_success 'setup a bare and non-bare repository' '
+	test_commit file1 &&
+	git clone --bare . bare
+'
+
+test_expect_success 'log and ls-files in a bare repository' '
+	(
+		cd bare &&
+		test_must_fail git log -- .. >out 2>err &&
+		test_must_be_empty out &&
+		test_i18ngrep "outside repository" err &&
+
+		test_must_fail git ls-files -- .. >out 2>err &&
+		test_must_be_empty out &&
+		test_i18ngrep "outside repository" err
+	)
+'
+
+test_expect_success 'log and ls-files in .git directory' '
+	(
+		cd .git &&
+		test_must_fail git log -- .. >out 2>err &&
+		test_must_be_empty out &&
+		test_i18ngrep "outside repository" err &&
+
+		test_must_fail git ls-files -- .. >out 2>err &&
+		test_must_be_empty out &&
+		test_i18ngrep "outside repository" err
+	)
+'
+
+test_done
diff --git a/t/t7300-clean.sh b/t/t7300-clean.sh
index 6e6d24c..cb5e34d 100755
--- a/t/t7300-clean.sh
+++ b/t/t7300-clean.sh
@@ -737,4 +737,13 @@
 	test_i18ngrep "too long" .git/err
 '
 
+test_expect_success 'clean untracked paths by pathspec' '
+	git init untracked &&
+	mkdir untracked/dir &&
+	echo >untracked/dir/file.txt &&
+	git -C untracked clean -f dir/file.txt &&
+	ls untracked/dir >actual &&
+	test_must_be_empty actual
+'
+
 test_done
diff --git a/t/t7410-submodule-checkout-to.sh b/t/t7410-submodule-checkout-to.sh
deleted file mode 100755
index f1b492e..0000000
--- a/t/t7410-submodule-checkout-to.sh
+++ /dev/null
@@ -1,77 +0,0 @@
-#!/bin/sh
-
-test_description='Combination of submodules and multiple workdirs'
-
-. ./test-lib.sh
-
-base_path=$(pwd -P)
-
-test_expect_success 'setup: make origin'  '
-	mkdir -p origin/sub &&
-	(
-		cd origin/sub && git init &&
-		echo file1 >file1 &&
-		git add file1 &&
-		git commit -m file1
-	) &&
-	mkdir -p origin/main &&
-	(
-		cd origin/main && git init &&
-		git submodule add ../sub &&
-		git commit -m "add sub"
-	) &&
-	(
-		cd origin/sub &&
-		echo file1updated >file1 &&
-		git add file1 &&
-		git commit -m "file1 updated"
-	) &&
-	git -C origin/main/sub pull &&
-	(
-		cd origin/main &&
-		git add sub &&
-		git commit -m "sub updated"
-	)
-'
-
-test_expect_success 'setup: clone' '
-	mkdir clone &&
-	git -C clone clone --recursive "$base_path/origin/main"
-'
-
-rev1_hash_main=$(git --git-dir=origin/main/.git show --pretty=format:%h -q "HEAD~1")
-rev1_hash_sub=$(git --git-dir=origin/sub/.git show --pretty=format:%h -q "HEAD~1")
-
-test_expect_success 'checkout main' '
-	mkdir default_checkout &&
-	git -C clone/main worktree add "$base_path/default_checkout/main" "$rev1_hash_main"
-'
-
-test_expect_failure 'can see submodule diffs just after checkout' '
-	git -C default_checkout/main diff --submodule master"^!" >out &&
-	grep "file1 updated" out
-'
-
-test_expect_success 'checkout main and initialize independent clones' '
-	mkdir fully_cloned_submodule &&
-	git -C clone/main worktree add "$base_path/fully_cloned_submodule/main" "$rev1_hash_main" &&
-	git -C fully_cloned_submodule/main submodule update
-'
-
-test_expect_success 'can see submodule diffs after independent cloning' '
-	git -C fully_cloned_submodule/main diff --submodule master"^!" >out &&
-	grep "file1 updated" out
-'
-
-test_expect_success 'checkout sub manually' '
-	mkdir linked_submodule &&
-	git -C clone/main worktree add "$base_path/linked_submodule/main" "$rev1_hash_main" &&
-	git -C clone/main/sub worktree add "$base_path/linked_submodule/main/sub" "$rev1_hash_sub"
-'
-
-test_expect_success 'can see submodule diffs after manual checkout of linked submodule' '
-	git -C linked_submodule/main diff --submodule master"^!" >out &&
-	grep "file1 updated" out
-'
-
-test_done
diff --git a/t/t7500-commit-template-squash-signoff.sh b/t/t7500-commit-template-squash-signoff.sh
index 46a5cd4..6d19ece 100755
--- a/t/t7500-commit-template-squash-signoff.sh
+++ b/t/t7500-commit-template-squash-signoff.sh
@@ -382,4 +382,13 @@
 	)
 '
 
+test_expect_success 'commit without staging files fails and displays hints' '
+	echo "initial" >file &&
+	git add file &&
+	git commit -m initial &&
+	echo "changes" >>file &&
+	test_must_fail git commit -m update >actual &&
+	test_i18ngrep "no changes added to commit (use \"git add\" and/or \"git commit -a\")" actual
+'
+
 test_done
diff --git a/t/t7800-difftool.sh b/t/t7800-difftool.sh
index 6bac9ed..29b9290 100755
--- a/t/t7800-difftool.sh
+++ b/t/t7800-difftool.sh
@@ -125,15 +125,14 @@
 	test_when_finished "rm -f for-diff .git/fail-right-file" &&
 	test_when_finished "git reset -- for-diff" &&
 	write_script .git/fail-right-file <<-\EOF &&
-	echo "$2"
+	echo failed
 	exit 1
 	EOF
 	>for-diff &&
 	git add for-diff &&
-	echo file >expect &&
 	test_must_fail git difftool -y --trust-exit-code \
 		--extcmd .git/fail-right-file branch >actual &&
-	test_cmp expect actual
+	test_line_count = 1 actual
 '
 
 test_expect_success 'difftool honors exit status if command not found' '
diff --git a/t/t7814-grep-recurse-submodules.sh b/t/t7814-grep-recurse-submodules.sh
index 946f91f..828cb3b 100755
--- a/t/t7814-grep-recurse-submodules.sh
+++ b/t/t7814-grep-recurse-submodules.sh
@@ -345,7 +345,16 @@
 }
 
 test_incompatible_with_recurse_submodules --untracked
-test_incompatible_with_recurse_submodules --no-index
+
+test_expect_success 'grep --recurse-submodules --no-index ignores --recurse-submodules' '
+	git grep --recurse-submodules --no-index -e "^(.|.)[\d]" >actual &&
+	cat >expect <<-\EOF &&
+	a:(1|2)d(3|4)
+	submodule/a:(1|2)d(3|4)
+	submodule/sub/a:(1|2)d(3|4)
+	EOF
+	test_cmp expect actual
+'
 
 test_expect_success 'grep --recurse-submodules should pass the pattern type along' '
 	# Fixed
diff --git a/transport.c b/transport.c
index 83379a0..1fdc7da 100644
--- a/transport.c
+++ b/transport.c
@@ -737,7 +737,7 @@
 {
 	struct git_transport_data *data = transport->data;
 	if (data->conn) {
-		if (data->got_remote_heads)
+		if (data->got_remote_heads && !transport->stateless_rpc)
 			packet_flush(data->fd[1]);
 		close(data->fd[0]);
 		close(data->fd[1]);
diff --git a/unpack-trees.c b/unpack-trees.c
index 2399b68..70247aa 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -694,9 +694,11 @@
 	if (pos >= 0)
 		BUG("This is a directory and should not exist in index");
 	pos = -pos - 1;
-	if (!starts_with(o->src_index->cache[pos]->name, name.buf) ||
+	if (pos >= o->src_index->cache_nr ||
+	    !starts_with(o->src_index->cache[pos]->name, name.buf) ||
 	    (pos > 0 && starts_with(o->src_index->cache[pos-1]->name, name.buf)))
-		BUG("pos must point at the first entry in this directory");
+		BUG("pos %d doesn't point to the first entry of %s in index",
+		    pos, name.buf);
 	strbuf_release(&name);
 	return pos;
 }
@@ -1305,14 +1307,14 @@
 
 	if (pl->use_cone_patterns && orig_ret == MATCHED_RECURSIVE) {
 		struct cache_entry **ce = cache;
-		rc = (cache_end - cache) / sizeof(struct cache_entry *);
+		rc = cache_end - cache;
 
 		while (ce < cache_end) {
 			(*ce)->ce_flags &= ~clear_mask;
 			ce++;
 		}
 	} else if (pl->use_cone_patterns && orig_ret == NOT_MATCHED) {
-		rc = (cache_end - cache) / sizeof(struct cache_entry *);
+		rc = cache_end - cache;
 	} else {
 		rc = clear_ce_flags_1(istate, cache, cache_end - cache,
 				      prefix,
@@ -1348,7 +1350,7 @@
 			    enum pattern_match_result default_match,
 			    int progress_nr)
 {
-	struct cache_entry **cache_end = cache + nr;
+	struct cache_entry **cache_end = nr ? cache + nr : cache;
 
 	/*
 	 * Process all entries that have the given prefix and meet
diff --git a/xdiff-interface.c b/xdiff-interface.c
index 8509f9e..4d20069 100644
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -84,8 +84,8 @@
 {
 	const int blk = 1024;
 	long trimmed = 0, recovered = 0;
-	char *ap = a->ptr + a->size;
-	char *bp = b->ptr + b->size;
+	char *ap = a->size ? a->ptr + a->size : a->ptr;
+	char *bp = b->size ? b->ptr + b->size : b->ptr;
 	long smaller = (a->size < b->size) ? a->size : b->size;
 
 	while (blk + trimmed <= smaller && !memcmp(ap - blk, bp - blk, blk)) {
@@ -250,9 +250,13 @@
 	ALLOC_ARRAY(regs->array, regs->nr);
 	for (i = 0; i < regs->nr; i++) {
 		struct ff_reg *reg = regs->array + i;
-		const char *ep = strchr(value, '\n'), *expression;
+		const char *ep, *expression;
 		char *buffer = NULL;
 
+		if (!value)
+			BUG("mismatch between line count and parsing");
+		ep = strchr(value, '\n');
+
 		reg->negate = (*value == '!');
 		if (reg->negate && i == regs->nr - 1)
 			die("Last expression must not be negated: %s", value);
@@ -265,7 +269,7 @@
 		if (regcomp(&reg->re, expression, cflags))
 			die("Invalid regexp to look for hunk header: %s", expression);
 		free(buffer);
-		value = ep + 1;
+		value = ep ? ep + 1 : NULL;
 	}
 }