From: Eric Wheeler <g...@linux.ewheeler.net> When bch_cache_set_alloc() fails to kzalloc the cache_set, the asyncronous closure handling tries to dereference a cache_set that hadn't yet been allocated inside of cache_set_flush() which is called by __cache_set_unregister() during cleanup. This appears to happen only during an OOM condition on bcache_register.
Signed-off-by: Eric Wheeler <bca...@linux.ewheeler.net> Cc: sta...@vger.kernel.org https://jira.sw.ru/browse/PSBM-106785 (cherry picked from commit f8b11260a445169989d01df75d35af0f56178f95) Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com> --- drivers/md/bcache/super.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 88a008577dc0..f06212f856c6 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -1295,6 +1295,9 @@ static void cache_set_flush(struct closure *cl) set_bit(CACHE_SET_STOPPING_2, &c->flags); wake_up(&c->alloc_wait); + if (!c) + closure_return(cl); + bch_cache_accounting_destroy(&c->accounting); kobject_put(&c->internal); -- 2.26.2 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel