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Date: Thu, 8 May 2014 09:38:51 +0400 From: Cyrill Gorcunov <gorcunov@...il.com> To: Don Zickus <dzickus@...hat.com> Cc: Vince Weaver <vincent.weaver@...ne.edu>, linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org> Subject: Re: perf_fuzzer crash on pentium 4 On Wed, May 07, 2014 at 10:00:50PM -0400, Don Zickus wrote: > > > > If i'm right (btw it's possible to use addr2line helper?) then hwc->config > > is corrupted and p4_config_get_bind returned nil simply because proper event > > was not found. And I don't understand how it could happen because before > > configuration gets written into hwc->config it's validated once obtained > > from user-space as a raw event. Weird... > > I think my commit 13beacee817d27a40ffc6f065ea0042685611dd5 explains this > corruption. Though I have to admit I haven't looked through the problem > very closely yet. nope ;) without the fix above we could (and we did) simply misconfigure counter but never get access out of array bound. anyway, Vince confirm the fix from PeterZ healed the problem. > IOW my lazy fix in that commit doesn't cover fuzzers and the real problem > in p4_pmu_schedule_events. :-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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