linux-kernel - Re: perf fuzzer crash [PATCH] perf: Get group events reference before moving the group

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Date:	Sun, 18 Jan 2015 22:49:46 -0500 (EST)
From:	Vince Weaver <vince@...ter.net>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
	mark.rutland@....com,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: perf fuzzer crash [PATCH] perf: Get group events reference before
 moving the group

On Fri, 16 Jan 2015, Vince Weaver wrote:
> 
> I just wanted to report that I've tested both this patch and Jiri's 
> original one and they both keep my easy-to-trigger-testcase from crashing 
> my core2 machine (when applied against 3.18).

I've continued fuzzing all weekend, with PeterZ's patch 
applied to 3.19-rc4.  It has managed to stay up without crashing, 
impressive.   

Fuzzing still turns up a few issues but no crashes:

[ 1753.904001] WARNING: CPU: 0 PID: 23800 at arch/x86/kernel/hw_breakpoint.c:119 arch_install_hw_breakpoint+0x6a/0xf6()
[ 1753.904001] Can't find any breakpoint slot

(I thought we had fixed that one).

[80608.209702] Uhhuh. NMI received for unknown reason 3d on CPU 0.
[80608.212041] Do you have a strange power saving mode enabled?
[80608.212041] Dazed and confused, but trying to continue

(these are common but don't seem to affect system stability).

Vince
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