> diff --git i/drivers/md/md.c w/drivers/md/md.c
> index 6072782070230..49442a3f4605b 100644
> --- i/drivers/md/md.c
> +++ w/drivers/md/md.c
> @@ -7591,8 +7591,10 @@ static int md_ioctl(struct block_device *bdev,
> fmode_t mode,
> err = -EBUSY;
> goto out;
> }
> - WARN_ON_ONCE(test_bit(MD_CLOSING, &mddev->flags));
> - set_bit(MD_CLOSING, &mddev->flags);
> + if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
> + err = -EBUSY;
> + goto out;
> + }
> did_set_md_closing = true;
> mutex_unlock(&mddev->open_mutex);
> sync_blockdev(bdev);
>
> Could you please test whether this fixes the issue?
Since &mddev->open_mutex is held when testing a bit of mddev->flags, I
modified the code just a little bit by putting mutex_unlock() as
belows.
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 98bac4f304ae..643f7f5be49b 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -7590,8 +7590,11 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
err = -EBUSY;
goto out;
}
- WARN_ON_ONCE(test_bit(MD_CLOSING, &mddev->flags));
- set_bit(MD_CLOSING, &mddev->flags);
+ if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
+ mutex_unlock(&mddev->open_mutex);
+ err = -EBUSY;
+ goto out;
+ }
did_set_md_closing = true;
mutex_unlock(&mddev->open_mutex);
sync_blockdev(bdev);
The warning no longer recurs (of course, we removed
WARN_ON_ONCE()). As I am not familiar with this code, I do not see any
other problem.
Best regards,
Dae R. Jeong
