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Subject: Re: 5.14.0-rc1 KASAN use after free
From:   Paolo Valente <paolo.valente@linaro.org>
In-Reply-To: <CAJfuBxwJam5=s3Rr06RyLoO19s3HTBomnNi6P3dw59s_b7we+Q@mail.gmail.com>
Date:   Mon, 2 Aug 2021 16:21:20 +0200
Cc:     Jens Axboe <axboe@kernel.dk>,
        Oleksandr Natalenko <oleksandr@natalenko.name>,
        LKML <linux-kernel@vger.kernel.org>, linux-block@vger.kernel.org
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Message-Id: <FE6B2429-5846-4EE8-896A-691BD11C76D0@linaro.org>
References: <CAJfuBxxVEVwj=hGa+FoQUV6i7BtoUbiJwGunnRq26Fp=Ax2ziQ@mail.gmail.com>
 <8057650.rSI8SBESIY@natalenko.name>
 <98103103-c517-59d2-a4d6-9b0758cbdfc1@kernel.dk>
 <CAJfuBxwJam5=s3Rr06RyLoO19s3HTBomnNi6P3dw59s_b7we+Q@mail.gmail.com>
To:     jim.cromie@gmail.com
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> Il giorno 23 lug 2021, alle ore 15:08, jim.cromie@gmail.com ha =
scritto:
>=20
> On Sun, Jul 18, 2021 at 5:58 PM Jens Axboe <axboe@kernel.dk> wrote:
>>=20
>> On 7/18/21 3:08 PM, Oleksandr Natalenko wrote:
>>> + Paolo, Jens et al.
>>>=20
>>> On =C4=8Dtvrtek 15. =C4=8Dervence 2021 16:32:29 CEST =
jim.cromie@gmail.com wrote:
>>>> hi all,
>>>>=20
>>>> 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
>>>>=20
>>>>=20
>>>> [   33.663464] Bluetooth: RFCOMM ver 1.11
>>>> [  646.343628]
>>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D [
>>>> 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
>>=20
>> 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?
>>=20
>=20
> oops, didn't see this earlier.
> It hasnt happened since, I can try to recreate mid-next-week
>=20

Still nothing?

Thanks,
Paolo

>=20
>> --
>> Jens Axboe