linux-kernel - Re: possible deadlock in down_trylock/perf_event

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Date:   Wed, 13 Dec 2023 09:54:09 -0500 (EST)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     xingwei lee <xrivendell7@...il.com>
cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, namhyung@...nel.org, irogers@...gle.com,
        adrian.hunter@...el.com, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: possible deadlock in down_trylock/perf_event_open

On Mon, 11 Dec 2023, xingwei lee wrote:

> Hello I found a bug in kernel/perf in the lastest upstream linux 6.7.rc5
> possible deadlock in down_trylock/perf_event_open
> 
> If you fix this issue, please add the following tag to the commit:
> Reported-by: xingwei Lee <xrivendell7@...il.com>
> 

> 
> syzkaller login: root
> Linux syzkaller 6.7.0-rc5 #3 SMP PREEMPT_DYNAMIC Mon Dec 11 17:02:24
> HKT 2023 x86_64
> root@...kaller:~# ./572
> [  113.795108][ T8266] ------------[ cut here ]------------
> [  113.795707][ T8266] WARNING: CPU: 1 PID: 8266 at
> kernel/events/core.c:1950 __do_sys_perf_event_open0


Just wanted to add that the perf_fuzzer will trigger this warning more or 
less immediately as well.

Vince