linux-kernel - Re: [perf] perf_fuzzer causes unchecked MSR access error

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Date:   Wed, 3 Mar 2021 15:22:57 -0500 (EST)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     "Liang, Kan" <kan.liang@...ux.intel.com>
cc:     Stephane Eranian <eranian@...gle.com>,
        Vince Weaver <vincent.weaver@...ne.edu>,
        LKML <linux-kernel@...r.kernel.org>,
        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>
Subject: Re: [perf] perf_fuzzer causes unchecked MSR access error

On Wed, 3 Mar 2021, Liang, Kan wrote:

> We never use bit 58. It should be a new issue.
> Is it repeatable?

yes, it's repeatable.  

(which I'm glad to see because it looks suspiciously like a memory bit 
flip)

Though since it's a WARN_ONCE I have to reboot each time I want to test.

If I get a chance I'll try to come up with a reduced test case but 
probably won't have time for that today.

Vince