From: Mikulas Patocka mpatocka@redhat.com
mainline inclusion from mainline-v6.3-rc4 commit fb294b1c0ba982144ca467a75e7d01ff26304e2b category: bugfix bugzilla: 188393, https://gitee.com/openeuler/kernel/issues/I6JPSH
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
----------------------------------------
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: yangerkun yangerkun@huawei.com Reviewed-by: Hou Tao houtao1@huawei.com Reviewed-by: Yu Kuai yukuai3@huawei.com Signed-off-by: Jialin Zhang zhangjialin11@huawei.com --- 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 3d975db86434..17ddca293965 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -1934,6 +1934,7 @@ 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); }