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SubjectRe: [syzbot] [wireguard?] KASAN: slab-use-after-free Write in enqueue_timer
On Wed, 24 May 2023 08:33:41 -0700 Jakub Kicinski wrote:
> On Wed, 24 May 2023 10:24:31 +0200 Dmitry Vyukov wrote:
> > FWIW There are more report examples on the dashboard.
> > There are some that don't mention wireguard nor usbnet, e.g.:
> > https://syzkaller.appspot.com/text?tag=CrashReport&x=17dd2446280000
> > So that's probably red herring. But they all seem to mention alloc_netdev_mqs.
>
> While we have you, let me ask about the possibility of having vmcore
> access - I think it'd be very useful to solve this mystery.
> With a bit of luck the timer still has the function set.

I take that back.

Memory state around the buggy address:
ffff88801ecc1400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801ecc1480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801ecc1500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801ecc1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801ecc1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb

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