This is a note to let you know that I've just added the patch titled
afs: Fix endless loop in directory parsing
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
afs-fix-endless-loop-in-directory-parsing.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 519ae9b92f5b9be2440bd1a9c2b6f051c782f10d
Author: David Howells <dhowells@xxxxxxxxxx>
Date: Fri Feb 23 13:15:02 2024 +0000
afs: Fix endless loop in directory parsing
[ Upstream commit 5f7a07646655fb4108da527565dcdc80124b14c4 ]
If a directory has a block with only ".__afsXXXX" files in it (from
uncompleted silly-rename), these .__afsXXXX files are skipped but without
advancing the file position in the dir_context. This leads to
afs_dir_iterate() repeating the block again and again.
Fix this by making the code that skips the .__afsXXXX file also manually
advance the file position.
The symptoms are a soft lookup:
watchdog: BUG: soft lockup - CPU#3 stuck for 52s! [check:5737]
...
RIP: 0010:afs_dir_iterate_block+0x39/0x1fd
...
? watchdog_timer_fn+0x1a6/0x213
...
? asm_sysvec_apic_timer_interrupt+0x16/0x20
? afs_dir_iterate_block+0x39/0x1fd
afs_dir_iterate+0x10a/0x148
afs_readdir+0x30/0x4a
iterate_dir+0x93/0xd3
__do_sys_getdents64+0x6b/0xd4
This is almost certainly the actual fix for:
https://bugzilla.kernel.org/show_bug.cgi?id=218496
Fixes: 57e9d49c5452 ("afs: Hide silly-rename files from userspace")
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Link: https://lore.kernel.org/r/786185.1708694102@xxxxxxxxxxxxxxxxxxxxxx
Reviewed-by: Marc Dionne <marc.dionne@xxxxxxxxxxxx>
cc: Marc Dionne <marc.dionne@xxxxxxxxxxxx>
cc: Markus Suvanto <markus.suvanto@xxxxxxxxx>
cc: linux-afs@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index cf811b77ee671..6e2c967fae6fc 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -478,8 +478,10 @@ static int afs_dir_iterate_block(struct afs_vnode *dvnode,
dire->u.name[0] == '.' &&
ctx->actor != afs_lookup_filldir &&
ctx->actor != afs_lookup_one_filldir &&
- memcmp(dire->u.name, ".__afs", 6) == 0)
+ memcmp(dire->u.name, ".__afs", 6) == 0) {
+ ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
continue;
+ }
/* found the next entry */
if (!dir_emit(ctx, dire->u.name, nlen,
