linux-kernel - Re: [PATCH] perf/x86/amd: check event before enable to avoid GPF

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Message-ID: <61e23449-d77e-4f2c-929c-1cf0f32832a8@amd.com>
Date: Mon, 3 Jun 2024 10:09:22 +0530
From: Ravi Bangoria <ravi.bangoria@....com>
To: George Kennedy <george.kennedy@...cle.com>
Cc: harshit.m.mogalapalli@...cle.com, peterz@...radead.org, mingo@...hat.com,
 acme@...nel.org, namhyung@...nel.org, mark.rutland@....com,
 alexander.shishkin@...ux.intel.com, jolsa@...nel.org, irogers@...gle.com,
 adrian.hunter@...el.com, kan.liang@...ux.intel.com, tglx@...utronix.de,
 bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
 linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
 ravi.bangoria@....com
Subject: Re: [PATCH] perf/x86/amd: check event before enable to avoid GPF

Hi George,

>>> Syzkaller reported a GPF in amd_pmu_enable_all.
>> Can you please provide a bug report link? Also, any reproducer?
> The Syzkaller reproducer can be found in this link:
> https://lore.kernel.org/netdev/CAMt6jhyec7-TSFpr3F+_ikjpu39WV3jnCBBGwpzpBrPx55w20g@mail.gmail.com/T/#u

I'm _not_ able to reproduce the issue with this syzkaller reproducer. I ran
it for more than 12 hours. Here is my setup.

- EYPC Zen3 Milan _host_
- Fedora 40
- v6.9 vanilla kernel with attached config
- Syzkaller command running as a root
  # ./syz-execprog -executor=./syz-executor -threaded=1 -repeat=0 -procs=8 2-repro.prog
- Also tried with C program generated using:
  # ./syz-prog2c -procs=8 -repeat=0 -threaded=1 -tmpdir=1 -segv=true -prog=2-repro.prog > 2-repro.c

Can you please provide your config and system detail in case you are able
to reproduce it.

Thanks,
Ravi
View attachment "config.syzkaller.milan" of type "text/plain" (171404 bytes)