netdev - Re: [PATCH] SCTP: Free the per-net sysctl table on net exit. v2

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Message-ID: <5106ECCF.7080105@fold.natur.cuni.cz>
Date:	Mon, 28 Jan 2013 22:25:35 +0100
From:	Martin Mokrejs <mmokrejs@...d.natur.cuni.cz>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	David Miller <davem@...emloft.net>, vyasevich@...il.com,
	netdev@...r.kernel.org, linux-sctp@...r.kernel.org
Subject: Re: [PATCH] SCTP: Free the per-net sysctl table on net exit. v2

Martin Mokrejs wrote:
> Hi Eric,
> 
> Eric W. Biederman wrote:
>> Martin Mokrejs <mmokrejs@...d.natur.cuni.cz> writes:
>>
>>> David Miller wrote:
>>>> From: ebiederm@...ssion.com (Eric W. Biederman)
>>>> Date: Sun, 27 Jan 2013 19:25:11 -0800
>>>>
>>>>> The typo is fixed in the patch this time in addition to my test
>>>>> tree.
>>>>
>>>> Applied, thanks for fixing this up Eric.

> So I haven't tested the patch yet. doh. Provided I am running 3 days without reproducing
> the original memleak on an unpatched kernel I doubt I can easily prove it after a reboot.

Umm, I spoke too early. It did happen again during these 3 days on unpatched 3.7.4:

unreferenced object 0xffff880402769030 (size 2048):
  comm "chrome_sandbox", pid 4720, jiffies 4294966701 (age 285697.590s)
  hex dump (first 32 bytes):
    b2 68 89 81 ff ff ff ff 20 84 4f d8 03 88 ff ff  .h...... .O.....
    04 00 00 00 a4 01 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff815b4aad>] kmemleak_alloc+0x21/0x3e
    [<ffffffff81110352>] slab_post_alloc_hook+0x28/0x2a
    [<ffffffff81113fad>] __kmalloc_track_caller+0xf1/0x104
    [<ffffffff810f10c2>] kmemdup+0x1b/0x30
    [<ffffffff81571e9f>] sctp_sysctl_net_register+0x1f/0x72
    [<ffffffff8155d305>] sctp_net_init+0x100/0x39f
    [<ffffffff814ad53c>] ops_init+0xc6/0xf5
    [<ffffffff814ad5b7>] setup_net+0x4c/0xd0
    [<ffffffff814ada5e>] copy_net_ns+0x6d/0xd6
    [<ffffffff810938b1>] create_new_namespaces+0xd7/0x147
    [<ffffffff810939f4>] copy_namespaces+0x63/0x99
    [<ffffffff81076733>] copy_process+0xa65/0x1233
    [<ffffffff81077030>] do_fork+0x10b/0x271
    [<ffffffff8100a0e9>] sys_clone+0x23/0x25
    [<ffffffff815dda73>] stub_clone+0x13/0x20
    [<ffffffffffffffff>] 0xffffffffffffffff

But I won't make it to a reboot in next 2-3 days to test the patch v2, sorry.

Martin
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