linux-kernel - Re: perf: use after free in perf_remove_from

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Message-ID: <20140514165205.GU30445@twins.programming.kicks-ass.net>
Date:	Wed, 14 May 2014 18:52:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Ingo Molnar <mingo@...nel.org>, acme@...stprotocols.net,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dave Jones <davej@...hat.com>
Subject: Re: perf: use after free in perf_remove_from_context

On Wed, May 14, 2014 at 12:38:10PM -0400, Sasha Levin wrote:
> ./trinity -xinit_module -xreboot -xshutdown -xunshare -xnfsservctl -xclock_nanosleep -xuselib -xumount -xmount -m --quiet --dangerous -C 400 -l off
> 
> Note that I run it as root in a disposable VM. Running that as root on your
> machine will likely kill it.

Right, so i'll start with !root running. That said, I seem to get an
endless stream of double free or corrupt msgs:

trinity$ ./trinity -xinit_module -xreboot -xshutdown -xunshare -xnfsservctl -xclock_nanosleep -xuselib -xumount -xmount -m --quiet  -C 400 -l off

...

*** Error in `./trinity': double free or corruption (top): 0x000000000135af60 ***
[main] Random reseed: 3671679404
[main] Random reseed: 67838733
*** Error in `./trinity': double free or corruption (top): 0x000000000135ef60 ***
[main] Random reseed: 943044433
*** Error in `./trinity': double free or corruption (top): 0x00000000012bb210 ***
[main] Random reseed: 3627649145
*** Error in `./trinity': double free or corruption (top): 0x000000000139dbe0 ***
[main] Random reseed: 935036390
[main] Random reseed: 3922349807
[main] Random reseed: 835563887
*** Error in `./trinity': double free or corruption (top): 0x0000000001323890 ***
[main] Random reseed: 974945617
*** Error in `./trinity': double free or corruption (top): 0x0000000001308190 ***
[main] Random reseed: 2912296953
[main] Random reseed: 681900861


Is this 'expected' behaviour?

trinity$ git describe
1.1-1418-g8bf4840


Content of type "application/pgp-signature" skipped