Re: [PATCH] btrfs: fix a race in encoded read

[Daniel Vacek]

Hi Johannes,

On Thu, Dec 12, 2024 at 9:00 AM Johannes Thumshirn
<Johannes.Thumshirn@xxxxxxx> wrote:
>
> On 12.12.24 08:54, Daniel Vacek wrote:
> > While testing the encoded read feature the following crash was observed
> > and it can be reliably reproduced:
> >
>
>
> Hi Daniel,
>
> This suspiciously looks like '05b36b04d74a ("btrfs: fix use-after-free
> in btrfs_encoded_read_endio()")'. Do you have this patch applied to your
> kernel? IIRC it went upstream with 6.13-rc2.

Yes, I do. This one is on top of it. The crash happens with
`05b36b04d74a` applied. All the crashes were reproduced with
build of `feffde684ac2`.

Honestly, `05b36b04d74a` looks a bit suspicious to me as it really
does not look to deal correctly with the issue to me. I was a bit
surprised/puzzled.

Anyways, I could reproduce the crash in a matter of half an hour. With
this fix the torture is surviving for 22 hours atm.

--nX