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

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Date:	Tue, 9 Sep 2014 12:06:40 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: perf: perf_fuzzer triggers instant reboot

On Mon, 8 Sep 2014, Peter Zijlstra wrote:

> On Mon, Sep 08, 2014 at 01:47:11PM -0400, Vince Weaver wrote:
> > Hello
> > 
> > so I finally had time to run my perf_fuzzer again and it has rapidly 
> > turned up an alarming crash that instant-reboots my core2 test machine.
> 
> Urgh, of course :/

So possibly was a waste of time, as it bisects to:

	commit 5e467e27b7c7a11ef47068138248003e873674a1
	Author: Tony Luck <tony.luck@...el.com>
	Date:   Wed Jul 30 14:05:15 2014 -0700

	    [IA64] Wire up getrandom() system call

Which makes no sense at all :(

The times the testcase fails give some pretty spectacular error messages:


[   78.018145] NOHZ: local_softirq_pending 100
[   83.012661] BUG: Bad page map in process perf_fuzzer  pte:ffff8800cafc5190 pmd:119d00067
[   83.020863] addr:000000000120c000 vm_flags:00100073 anon_vma:ffff8800cae19dc0 mapping:          (null) index:120c

[  316.040001] general protection fault: 0000 [#1] 

[  178.024220] perf_fuzzer[2788]: segfault at ffff88011fa7bef8 ip 00007f8c0e088c2f sp 00007fff003315e0 error 5

[ 2616.535995] Kernel panic - not syncing: Lost physical address for unconsumed uncorrectable error


[  751.656861] NOHZ: local_softirq_pending 100
[  756.009271] traps: perf_fuzzer[4236] trap invalid opcode ip:4044c0 sp:7fffb0ed6f90 error:0
[  756.017590] BUG: unable to handle kernel paging request

among others.

Vince
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