linux-kernel - Re: 5.14.0-rc1 KASAN use after free

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Date:   Fri, 23 Jul 2021 09:08:32 -0400
From:   jim.cromie@...il.com
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Oleksandr Natalenko <oleksandr@...alenko.name>,
        LKML <linux-kernel@...r.kernel.org>,
        Paolo Valente <paolo.valente@...aro.org>,
        linux-block@...r.kernel.org
Subject: Re: 5.14.0-rc1 KASAN use after free

On Sun, Jul 18, 2021 at 5:58 PM Jens Axboe <axboe@...nel.dk> wrote:
>
> On 7/18/21 3:08 PM, Oleksandr Natalenko wrote:
> > + Paolo, Jens et al.
> >
> > On čtvrtek 15. července 2021 16:32:29 CEST jim.cromie@...il.com wrote:
> >> hi all,
> >>
> >> I noticed this report this morning, from 3 days ago,
> >> about 10 minutes after boot.
> >> Its easiest to ignore it, and I dont want to make a fuss,
> >> but it looks useful to someone
> >>
> >>
> >> [   33.663464] Bluetooth: RFCOMM ver 1.11
> >> [  646.343628]
> >> ================================================================== [
> >> 646.343649] BUG: KASAN: use-after-free in bfq_get_queue+0x47d/0x900 [
> >> 646.343680] Read of size 8 at addr ffff88810d864a00 by task
> >> journal-offline/1639
>
> There are only a few commits between 5.13 and master in this area, see
> attached. I'd just start reverting from the top, one by one, and see
> which one is causing the issue. Jim, would that be feasible?
>

oops, didn't see this earlier.
It hasnt happened since, I can try to recreate mid-next-week


> --
> Jens Axboe
>