From: Sasha Levin <sashal@kernel.org>
To: stable-commits@vger.kernel.org, mpatocka@redhat.com
Cc: Alasdair Kergon <agk@redhat.com>,
Mike Snitzer <snitzer@kernel.org>,
dm-devel@lists.linux.dev
Subject: Patch "dm snapshot: fix lockup in dm_exception_table_exit" has been added to the 5.10-stable tree
Date: Wed, 27 Mar 2024 07:52:03 -0400 [thread overview]
Message-ID: <20240327115203.2817244-1-sashal@kernel.org> (raw)
This is a note to let you know that I've just added the patch titled
dm snapshot: fix lockup in dm_exception_table_exit
to the 5.10-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:
dm-snapshot-fix-lockup-in-dm_exception_table_exit.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
commit d34dc105da100e9ea5d00a6b7a2f6d4cd1302f9a
Author: Mikulas Patocka <mpatocka@redhat.com>
Date: Wed Mar 20 18:43:11 2024 +0100
dm snapshot: fix lockup in dm_exception_table_exit
[ Upstream commit 6e7132ed3c07bd8a6ce3db4bb307ef2852b322dc ]
There was reported lockup when we exit a snapshot with many exceptions.
Fix this by adding "cond_resched" to the loop that frees the exceptions.
Reported-by: John Pittman <jpittman@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 41735a25d50aa..de73fe79640fd 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -685,8 +685,10 @@ static void dm_exception_table_exit(struct dm_exception_table *et,
for (i = 0; i < size; i++) {
slot = et->table + i;
- hlist_bl_for_each_entry_safe(ex, pos, n, slot, hash_list)
+ hlist_bl_for_each_entry_safe(ex, pos, n, slot, hash_list) {
kmem_cache_free(mem, ex);
+ cond_resched();
+ }
}
vfree(et->table);
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