linux-kernel - Re: crypto: ablk_decrypt causes BUG in scatterwalk

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Date:	Tue, 12 Jan 2016 14:23:05 +0100
From:	Dmitry Vyukov <dvyukov@...gle.com>
To:	syzkaller <syzkaller@...glegroups.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: crypto: ablk_decrypt causes BUG in scatterwalk

On Tue, Jan 12, 2016 at 2:16 PM, Herbert Xu <herbert@...dor.apana.org.au> wrote:
> On Tue, Jan 12, 2016 at 10:27:44AM +0100, Dmitry Vyukov wrote:
>> Hello,
>>
>> The following program cause BUG in scatterwalk:
>
> Weird, I can't reproduce the crash.  Can you perhaps convert this to
> a non-racy reproduction, possibly by using strace to find the order
> of execution that leads to the crash?


Concurrent execution seems to be important to reproduce the crash. I
wasn't able to reproduce it in single-threaded mode.
Try to run it in a tight parallel loop for some time.