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: <53778D40.5020203@oracle.com>
Date:	Sat, 17 May 2014 12:24:32 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	"Theodore Ts'o" <tytso@....edu>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>, acme@...stprotocols.net,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dave Jones <davej@...hat.com>, price@....edu
Subject: Re: BUG_ON drivers/char/random.c:986 (Was: perf: use after free in
 perf_remove_from_context)

On 05/16/2014 10:18 PM, Theodore Ts'o wrote:
> On Fri, May 16, 2014 at 05:46:22PM -0700, Hannes Frederic Sowa wrote:
>> > This should do the trick:
>> > dd if=/dev/urandom of=/dev/zero bs=67108707
>> > 
>> > I suspect ee1de406ba6eb1 ("random: simplify accounting logic") as the
>> > culprit.
> Yep, that it's it.  Thanks for noticing this so quickly!  I'll push
> the following patch to Linus.

Peter, could you describe the infrastructure you're running on? I don't
think Dave or myself have ever hit this issue, and I wonder what made you
stumble on it.


Thanks,
Sasha
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