Re: possible deadlock in down_trylock/perf_event_open

[Vince Weaver]

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@xxxxxxxxx>
> 

> 
> syzkaller login: root
> Linux syzkaller 6.7.0-rc5 #3 SMP PREEMPT_DYNAMIC Mon Dec 11 17:02:24
> HKT 2023 x86_64
> root@syzkaller:~# ./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