From: Mikulas Patocka <mpatocka@redhat.com>
Date: Mon, 6 Mar 2023 11:17:58 -0500
Subject: [PATCH] dm crypt: add cond_resched() to dmcrypt_write()
References: bsc#1012628
Patch-mainline: 6.2.9
Git-commit: fb294b1c0ba982144ca467a75e7d01ff26304e2b
commit fb294b1c0ba982144ca467a75e7d01ff26304e2b upstream.
The loop in dmcrypt_write may be running for unbounded amount of time,
thus we need cond_resched() in it.
This commit fixes the following warning:
[ 3391.153255][ C12] watchdog: BUG: soft lockup - CPU#12 stuck for 23s! [dmcrypt_write/2:2897]
...
[ 3391.387210][ C12] Call trace:
[ 3391.390338][ C12] blk_attempt_bio_merge.part.6+0x38/0x158
[ 3391.395970][ C12] blk_attempt_plug_merge+0xc0/0x1b0
[ 3391.401085][ C12] blk_mq_submit_bio+0x398/0x550
[ 3391.405856][ C12] submit_bio_noacct+0x308/0x380
[ 3391.410630][ C12] dmcrypt_write+0x1e4/0x208 [dm_crypt]
[ 3391.416005][ C12] kthread+0x130/0x138
[ 3391.419911][ C12] ret_from_fork+0x10/0x18
Reported-by: yangerkun <yangerkun@huawei.com>
Fixes: dc2676210c42 ("dm crypt: offload writes to thread")
Cc: stable@vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/md/dm-crypt.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 2653516b..6c43ac38 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1933,6 +1933,7 @@ static int dmcrypt_write(void *data)
io = crypt_io_from_node(rb_first(&write_tree));
rb_erase(&io->rb_node, &write_tree);
kcryptd_io_write(io);
+ cond_resched();
} while (!RB_EMPTY_ROOT(&write_tree));
blk_finish_plug(&plug);
}
--
2.35.3