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dm snapshot: fix lockup in dm_exception_table_exit

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[ 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>
This commit is contained in:
Mikulas Patocka 2024-03-20 18:43:11 +01:00 committed by Ksawlii
parent c85f7a3f93
commit 1cded74e96
1 changed files with 3 additions and 1 deletions
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4
drivers/md/dm-snap.c
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@ -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);