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Re: NULL ptr deref in perf/filter_match

From Vegard Nossum <vegard.nossum@gmail.com>
Newsgroups linux.kernel
Subject Re: NULL ptr deref in perf/filter_match
Date 2016-08-09 08:20 +0200
Message-ID <s48yl-3Q0-7@gated-at.bofh.it> (permalink)
References (1 earlier) <s0nPk-1RL-17@gated-at.bofh.it> <s2q6m-DV-41@gated-at.bofh.it> <s2sBc-2wI-3@gated-at.bofh.it> <s2tdT-2TC-5@gated-at.bofh.it> <s3Z22-63f-19@gated-at.bofh.it>
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On 8 August 2016 at 22:07, Vince Weaver <vincent.weaver@maine.edu> wrote:
> On Thu, 4 Aug 2016, Vegard Nossum wrote:
>> BTW, this seems to show up slightly more frequently although I've seen
>> it a couple of times before without your patch too so it's probably
>> unrelated:
>>
>> WARNING: CPU: 0 PID: 1244 at arch/x86/kernel/hw_breakpoint.c:121
>> arch_install_hw_breakpoint+0x284/0x2f0
>> Can't find any breakpoint slot
>
> are you using perf_fuzzer to find these bugs or some other tool?

Just using trinity + fault injection, although passing -c
perf_event_open hits it a lot faster.

> The "Can't find any breakpoint slot" warning dates back years, and there
> have been a few attempts to fix it but it's never gone away.

I'll just comment it out for now.

Thanks,


Vegard

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Thread

NULL ptr deref in perf/filter_match Vegard Nossum <vegard.nossum@gmail.com> - 2016-07-27 16:20 +0200
  Re: NULL ptr deref in perf/filter_match Vegard Nossum <vegard.nossum@gmail.com> - 2016-07-29 23:50 +0200
    Re: NULL ptr deref in perf/filter_match Vegard Nossum <vegard.nossum@gmail.com> - 2016-07-30 00:40 +0200
    Re: NULL ptr deref in perf/filter_match Peter Zijlstra <peterz@infradead.org> - 2016-08-04 14:40 +0200
      Re: NULL ptr deref in perf/filter_match Vegard Nossum <vegard.nossum@gmail.com> - 2016-08-04 17:20 +0200
        Re: NULL ptr deref in perf/filter_match Vegard Nossum <vegard.nossum@gmail.com> - 2016-08-04 18:00 +0200
          Re: NULL ptr deref in perf/filter_match Peter Zijlstra <peterz@infradead.org> - 2016-08-04 18:10 +0200
          Re: NULL ptr deref in perf/filter_match Vince Weaver <vincent.weaver@maine.edu> - 2016-08-08 22:10 +0200
            Re: NULL ptr deref in perf/filter_match Vegard Nossum <vegard.nossum@gmail.com> - 2016-08-09 08:20 +0200
      [tip:perf/core] perf/core: Fix sideband list-iteration vs. event  ordering NULL pointer deference crash tip-bot for Peter Zijlstra <tipbot@zytor.com> - 2016-08-10 21:50 +0200

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