netdev - Re: struct pid memory leak

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Date:	Sat, 23 Jan 2016 19:14:33 +0100
From:	Dmitry Vyukov <dvyukov@...gle.com>
To:	Willy Tarreau <w@....eu>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	netdev <netdev@...r.kernel.org>,
	Rainer Weikusat <rweikusat@...ileactivedefense.com>,
	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Vladimir Davydov <vdavydov@...tuozzo.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Eric Dumazet <edumazet@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: Re: struct pid memory leak

On Sat, Jan 23, 2016 at 7:00 PM, Willy Tarreau <w@....eu> wrote:
> Hi Eric, Dmitry,
>
> On Fri, Jan 22, 2016 at 08:50:01AM -0800, Eric Dumazet wrote:
>> CC netdev, as it looks some af_unix issue ...
>>
>> On Fri, 2016-01-22 at 16:08 +0100, Dmitry Vyukov wrote:
>> > Hello,
>> >
>> > The following program causes struct pid memory leak:
>> >
>> > // autogenerated by syzkaller (http://github.com/google/syzkaller)
> (...)
>> > unreferenced object 0xffff8800324af200 (size 112):
>> >   comm "syz-executor", pid 18413, jiffies 4295500287 (age 14.321s)
>> >   hex dump (first 32 bytes):
>> >     01 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00  ................
>> >     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>> >   backtrace:
>> >     [<ffffffff86315673>] kmemleak_alloc+0x63/0xa0 mm/kmemleak.c:916
>> >     [<     inline     >] kmemleak_alloc_recursive include/linux/kmemleak.h:47
> (...)
>> > On commit 30f05309bde49295e02e45c7e615f73aa4e0ccc2 (Jan 20).
>
> I can't reproduce this with the indicated commit. I'm unsure how/what
> I'm supposed to see. Is a certain config needed ? I've enabled kmemleak
> in my .config but there are too few information here to go further
> unfortunately.


Hi Willy,

I've attached my .config.
Also run this program in a parallel loop. I think it's leaking not
every time, probably some race is involved.

Download attachment ".config" of type "application/octet-stream" (138467 bytes)