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

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Message-ID: <20140514162943.GR30445@twins.programming.kicks-ass.net>
Date:	Wed, 14 May 2014 18:29:43 +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 Mon, May 12, 2014 at 11:42:33AM -0400, Sasha Levin wrote:
> Hi all,
> 
> While fuzzing with trinity inside a KVM tools guest running the latest -next
> kernel I've stumbled on the following spew. Maybe related to the very recent
> change in freeing on task exit?
> 
> [ 2509.827261] general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
> [ 2509.830379] Dumping ftrace buffer:
> [ 2509.830379]    (ftrace buffer empty)
> [ 2509.830379] Modules linked in:
> [ 2509.830379] CPU: 47 PID: 43306 Comm: trinity-c126 Tainted: G        W     3.15.0-rc5-next-20140512-sasha-00019-ga20bc00-dirty #456

Any particular trinity setup? And would you happen to have the seed of
that run?

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