linux-kernel - Re: perf: perf_fuzzer triggers instant reboot

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Message-ID: <20140910083136.GP6758@twins.programming.kicks-ass.net>
Date:	Wed, 10 Sep 2014 10:31:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: perf: perf_fuzzer triggers instant reboot

On Tue, Sep 09, 2014 at 01:53:50PM -0400, Vince Weaver wrote:
> 
> OK so trying to use ftrace to track this issue, and this happens (on 
> core2, 3.17-rc4)
> 
> [  295.992012] PANIC: double fault, error_code: 0x0
> [  295.992012] CPU: 1 PID: 2916 Comm: trace-cmd Not tainted 3.17.0-rc4+ #82
> [  295.992012] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015  10/19/2012
> [  295.992012] task: ffff8800cb20a800 ti: ffff8800ca30c000 task.ti: ffff8800ca30c000
> [  295.992012] RIP: 0010:[<ffffffff81037b92>]  [<ffffffff81037b92>] perf_trace_x86_exceptions+0x2d/0xb7
> [  295.992012] RSP: 0018:ffff8800bfffff58  EFLAGS: 00010082
> [  295.992012] RAX: 0000000000000001 RBX: ffff880037c9f490 RCX: 0000000000000000
> [  295.992012] RDX: ffff8800c0000098 RSI: ffffe8ffffc81010 RDI: ffffffff81a26600
> [  295.992012] RBP: ffff8800c0000058 R08: 0000000000044ea5 R09: ffffe8ffffc81010
> [  295.992012] R10: 0000000000000000 R11: ffff8800ca30fc48 R12: ffff8800c0000098
> [  295.992012] R13: ffffe8ffffc81010 R14: 0000000000000000 R15: ffffffff81a26600
> [  295.992012] FS:  00007f4217f82700(0000) GS:ffff88011fc80000(0000) knlGS:0000000000000000
> [  295.992012] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [  295.992012] CR2: ffff8800bfffff48 CR3: 00000000ca0b9000 CR4: 00000000000407e0
> [  295.992012] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [  295.992012] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
> [  295.992012] Stack:
> [  295.992012] PANIC: double fault, error_code: 0x0
> 

Sasha reported something from his KVM based fuzzing, maybe that's the
same. But that x86_exceptions thing is interesting, lemme go look at
that first.

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