Re: BUG: KASAN: use-after-free in enqueue_timer+0x4f/0x1e0

[Kim Phillips]

Hi,

On 10/5/21 1:10 PM, Kim Phillips wrote:
> Hi, I occasionally see the below trace with Linus' master on an
> AMD Milan system:
>
> [   25.657322] BUG: kernel NULL pointer dereference, address: 0000000000000000
> [   25.665097] #PF: supervisor instruction fetch in kernel mode
> [   25.671448] #PF: error_code(0x0010) - not-present page
<snip>
> That bisection led to this commit:
>
> commit aae74ff9caa8de9a45ae2e46068c417817392a26
> Author: Ainux <ainux.wang@xxxxxxxxx>
> Date:   Wed May 26 19:15:15 2021 +0800
>      drm/ast: Add detect function support
<snip>
> I confirmed that if I revert it from v5.15-rc4 (after reverting
> its dependent 572994bf18ff "drm/ast: Zero is missing in detect
> function"), the problem goes away.
>
> Full .config, dmesg attached.
>
> I can test any possible fixes...


Ping - if no fixes are in the works, can the offending commit(s)
be reverted?

Thanks,

Kim