linux-kernel - Re: BUG_ON drivers/char/random.c:986 (Was: perf: use after free in perf_remove_from

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Message-ID: <53763775.3040602@linux.intel.com>
Date:	Fri, 16 May 2014 09:06:13 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	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>, tytso@....edu, price@....EDU,
	hannes@...essinduktion.org
Subject: Re: BUG_ON drivers/char/random.c:986 (Was: perf: use after free in
 perf_remove_from_context)

On 05/16/2014 08:34 AM, Peter Zijlstra wrote:
> 
> While fuzzing to reproduce my issue I hit the below, its triggered loads
> of times and then the machine wedged (needed a power cycle), I can
> provide the full console log if people care.
> 
> Anybody seen that one before?
> 

I certainly haven't... this bad.  Any idea what the actual system call
looked like?

The BUG_ON() in question indicates that r->entropy_count either
overflowed or underflowed... most likely underflowed I'd guess.

	-hpa

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