linux-kernel - Re: [Syzkaller & bisect] There is "__perf_event_overflow" WARNING in v6.1-rc5 kernel in guest

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Date:   Wed, 16 Nov 2022 15:40:24 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Pengfei Xu <pengfei.xu@...el.com>
Cc:     peter.zijlstra@...el.com, linux-kernel@...r.kernel.org,
        heng.su@...el.com
Subject: Re: [Syzkaller & bisect] There is "__perf_event_overflow" WARNING in
 v6.1-rc5 kernel in guest

On Wed, Nov 16, 2022 at 11:39:53AM +0800, Pengfei Xu wrote:
> Hi Peter and perf expert,
> 
> Greeting!
> 
> Platform: TGL-H
> 
> There is "__perf_event_overflow" WARNING issue in v6.1-rc5 kernel in
> guest in double check test.
> 
> Found first bad commit is ca6c21327c6af02b7eec31ce4b9a740a18c6c13f
> "perf: Fix missing SIGTRAPs"
> 
> And revert this commit on top of v6.1-rc5, this issue could not be reproduced.
> 
> Guest kconfig, reproduce code from syzkaller, and bisect info are in attached.
> 
> And more detailed info is in link:
> https://github.com/xupengfe/syzkaller_logs/tree/main/221114_134736___perf_event_overflow
> 
> If it's helpful and in time, please add the Reported-by tag from me.

Does this help?

https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=perf/urgent&id=bb88f9695460bec25aa30ba9072595025cf6c8af