Re: [PATCH v3] loop: Fix NULL pointer dereference in lo_rw_aio()

[Ming Lei]

On Wed, May 27, 2026 at 10:35:56AM +0900, Tetsuo Handa wrote:
> On 2026/05/27 10:20, Ming Lei wrote:
> >> Of course we should try to figure out the root cause first, but how can we do?
> > 
> > Definitely unexpected write IO(after umount & loop closed) from btrfs is more serious,
> > which may cause data loss, so CC btrfs list and maintainer.
> 
> Why do you assume that the culprit is btrfs?
> 
> https://syzkaller.appspot.com/bug?extid=bc273027d5643e48e5b3 indicated that
> this similar race is also happening with jfs.

I just didn't see the above report on jfs.

It doesn't change anything, the same question still stands: unexpected write IO is issued
or crosses umount & last closing of loop disk.



Thanks,
Ming