On Wed, Apr 28, 2021 at 1:31 AM Lidong Zhong [off-list ref] wrote:

The mddev data structure is freed in mddev_delayed_delete(), which is
schedualed after the array is deconfigured completely when stopping. So
there is a race window between md_open() and do_md_stop(), which leads
to /dev/mdX can still be opened by userspace even it's not accessible
any more. As a result, a DeviceDisappeared event will not be able to be
monitored by mdadm in monitor mode. This patch tries to fix it by adding
this new flag MD_DELETING.

Signed-off-by: Lidong Zhong <redacted>

Sorry for the delay. I missed this one.

As I try to apply the patch, I found the patch is somehow corrupted. It contains
special patterns like:

 =09if ((err =3D mutex_lock_interruptible(&mddev->open_mutex)))
 =09=09goto out;
=20
-=09if (test_bit(MD_CLOSING, &mddev->flags)) {
+=09if (test_bit(MD_CLOSING, &mddev->flags) ||
+            (test_bit(MD_DELETING, &mddev->flags) && mddev->pers =3D=3D NU=
LL)) {

Could you please try resend it?

Thanks,
Song