Re: 5.14.0-rc1 KASAN use after free

On Mon, Aug 2, 2021 at 8:21 AM Paolo Valente [off-list ref] wrote:

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Il giorno 23 lug 2021, alle ore 15:08, jim.cromie@gmail.com ha scritto:

On Sun, Jul 18, 2021 at 5:58 PM Jens Axboe [off-list ref] wrote:

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On 7/18/21 3:08 PM, Oleksandr Natalenko wrote:

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+ Paolo, Jens et al.

On čtvrtek 15. července 2021 16:32:29 CEST jim.cromie@gmail.com wrote:

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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

Still nothing?

Nada.

up to an hour ago, I was still running that installed kernel.
I just rebooted to it and ran a virtme session on it
(because of a possible 9p related trigger)
no sign of kasan err.

Im gonna boot rc4 built in the same build-dir,
I dont think Ive messed with the config,
but its a long-shot anyway to reproduce,
since same kernel image didnt do it 2nd time.

Thanks,
Paolo

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--
Jens Axboe