linux-kernel - Re: [perf] perf_fuzzer triggers NULL pointer derefernce in i915 driver

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Message-ID: <f2c6502a-f13e-a663-f1f5-c441964d77ac@intel.com>
Date:   Fri, 13 Dec 2019 11:20:39 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Vince Weaver <vincent.weaver@...ne.edu>,
        linux-kernel@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>
Subject: Re: [perf] perf_fuzzer triggers NULL pointer derefernce in i915
 driver

On 12/12/19 11:09 PM, Jani Nikula wrote:
> On Thu, 12 Dec 2019, Vince Weaver <vincent.weaver@...ne.edu> wrote:
>> with current git the perf_fuzzer was able to trigger this NULL pointer
>> de-reference in the i915 driver.
> Please file a bug.
> 
> https://gitlab.freedesktop.org/drm/intel/wikis/How-to-file-i915-bugs

I'm seeing the same thing.  It's annoyingly and immediately reproducible
for me:

	https://gitlab.freedesktop.org/drm/intel/issues/826

Let me know if you want anything fancier done like a bisect.  Looking
back through my kernel logs, it appears to also have happened with
5.4.0-rc4.