Patch "dm crypt: add cond_resched() to dmcrypt_write()" has been added to the 5.10-stable tree

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This is a note to let you know that I've just added the patch titled

    dm crypt: add cond_resched() to dmcrypt_write()

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-crypt-add-cond_resched-to-dmcrypt_write.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@xxxxxxxxxxxxxxx> know about it.


>From fb294b1c0ba982144ca467a75e7d01ff26304e2b Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Date: Mon, 6 Mar 2023 11:17:58 -0500
Subject: dm crypt: add cond_resched() to dmcrypt_write()

From: Mikulas Patocka <mpatocka@xxxxxxxxxx>

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@xxxxxxxxxx>
Fixes: dc2676210c42 ("dm crypt: offload writes to thread")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/md/dm-crypt.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1934,6 +1934,7 @@ pop_from_list:
 			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);
 	}


Patches currently in stable-queue which might be from mpatocka@xxxxxxxxxx are

queue-5.10/dm-crypt-add-cond_resched-to-dmcrypt_write.patch
queue-5.10/dm-thin-fix-deadlock-when-swapping-to-thin-device.patch



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