--- a/.hgsigs	Tue Oct 31 22:42:46 2023 -0700
+++ b/.hgsigs	Mon Nov 06 17:12:04 2023 +0100
@@ -250,3 +250,4 @@
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--- a/.hgtags	Tue Oct 31 22:42:46 2023 -0700
+++ b/.hgtags	Mon Nov 06 17:12:04 2023 +0100
@@ -266,3 +266,4 @@
 3ffc7209bbae5804a53084c9dc2d41139e88c867 6.5
 787af4e0e8b787e1b77a8059926b123730a4cd01 6.5.1
 5a8b5420103937fca97c584c5162178eed828ada 6.5.2
+c083d9776cb2fb6056715b2988d1ea48055f3162 6.5.3

--- a/mercurial/revlog.py	Tue Oct 31 22:42:46 2023 -0700
+++ b/mercurial/revlog.py	Mon Nov 06 17:12:04 2023 +0100
@@ -1279,6 +1279,9 @@
     @staticmethod
     def is_inline_index(header_bytes):
         """Determine if a revlog is inline from the initial bytes of the index"""
+        if len(header_bytes) == 0:
+            return True
+
         header = INDEX_HEADER.unpack(header_bytes)[0]
 
         _format_flags = header & ~0xFFFF

--- a/relnotes/6.5	Tue Oct 31 22:42:46 2023 -0700
+++ b/relnotes/6.5	Mon Nov 06 17:12:04 2023 +0100
@@ -1,3 +1,18 @@
+= Mercurial 6.5.3 =
+
+ * "hgweb: pass strings in WSGI environment correctly from wsgicgi"
+ * "perf: introduce more cache invalidation option in perf::tags"
+ * "perf: add a `--clear-fnode-cache-rev` argument to perf::tags"
+ * "perf: add a --update-last flag to perf::tags"
+ * "blackbox: add a option to duplicate output to stderr too"
+ * "tags: avoid expensive access to repo.changelog in a loop"
+ * "revlog: fix a bug where NULL_NODE failed to be resolved to NULL_REV"
+ * "httppeer: fix static-http: scheme autodetection (issue6833)"
+ * "tests: backed out changeset 8037ddacad47"
+ * "stream-clone: fix a crash when a repo with an empty revlog is cloned"
+ * "censor: accept censored revision during upgrade"
+ * "revlog: avoid opening and closing the file for each cloned revision"
+
 = Mercurial 6.5.2 =
 
  * hgweb: encode WSGI environment using the ISO-8859-1 codec

--- a/tests/test-clone-stream.t	Tue Oct 31 22:42:46 2023 -0700
+++ b/tests/test-clone-stream.t	Mon Nov 06 17:12:04 2023 +0100
@@ -980,3 +980,15 @@
   $ mkdir -p empty-repo/.hg
   $ hg clone -q --stream ssh://user@dummy/empty-repo empty-repo2
   $ hg --cwd empty-repo2 verify -q
+
+Cloning a repo with an empty manifestlog doesn't give some weird error
+
+  $ rm -r empty-repo; hg init empty-repo
+  $ (cd empty-repo; touch x; hg commit -Am empty; hg debugstrip -r 0) > /dev/null
+  $ hg clone -q --stream ssh://user@dummy/empty-repo empty-repo3
+  $ hg --cwd empty-repo3 verify -q 2>&1 | grep -v warning
+  [1]
+
+The warnings filtered out here are talking about zero-length 'orphan' data files.
+Those are harmless, so that's fine.
+