linux-kernel - Re: x86: bad pte in pageattr

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Date:	Fri, 10 Jun 2016 15:06:08 +0200
From:	Dmitry Vyukov <dvyukov@...gle.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: x86: bad pte in pageattr_test

On Fri, Jun 10, 2016 at 2:54 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Fri, 10 Jun 2016, Dmitry Vyukov wrote:
>> Here is the second log:
>> https://gist.githubusercontent.com/dvyukov/dd7970a5daaa7a30f6d37fa5592b56de/raw/f29182024538e604c95d989f7b398816c3c595dc/gistfile1.txt
>>
>> I've hit only twice. The first time I tried hard to reproduce it, with
>> no success. So unfortunately that's all we have.
>>
>> Re logs: my setup executes up to 16 programs in parallel. So for
>> normal BUGs any of the preceding 16 programs can be guilty. But since
>> this check is asynchronous, it can be just any preceding program in
>> the log.
>
> Ok.
>
>> I would expect that it is triggered by some rarely-executing poorly
>> tested code. Maybe mmap of some device?
>
> That's the mmap(dev) list which is common between the two log files:
>
> vcsn
> ircomm
> rfkill
> userio
> dspn
> mice
> midi
> sndpcmc
> hidraw0
> vga_arbiter
> lightnvm
> sr
>
> Dunno, if that's the right direction, but exposing these a bit more might be
> worth to try.


I am now running both of these logs for several hours (2.5M
executions). No failures so far...