linux-kernel - Re: mem_cgroup_page_lruvec: BUG: unable to handle kernel NULL pointer dereference at 00000000000001a8

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Date:	Thu, 13 Jun 2013 14:02:48 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	cgroups mailinglist <cgroups@...r.kernel.org>,
	"kamezawa.hiroyu@...fujitsu.com" <kamezawa.hiroyu@...fujitsu.com>,
	bsingharora@...il.com, hannes@...xchg.org
Subject: Re: mem_cgroup_page_lruvec: BUG: unable to handle kernel NULL
 pointer dereference at 00000000000001a8

On Thu 13-06-13 13:48:27, richard -rw- weinberger wrote:
> Hi!
> 
> While playing with user namespaces my kernel crashed under heavy load.
> Kernel is 3.9.0 plus some trivial patches.

Could you post disassembly for mem_cgroup_page_lruvec?

> [35355.882105] BUG: unable to handle kernel NULL pointer dereference
> at 00000000000001a8
> [35355.883056] IP: [<ffffffff811297d9>] mem_cgroup_page_lruvec+0x79/0x90
> [35355.883056] PGD 0
> [35355.883056] Oops: 0000 [#1] SMP
> [35355.883056] CPU 3
> [35355.883056] Pid: 477, comm: kswapd0 Not tainted 3.9.0+ #12 Bochs Bochs
> [35355.883056] RIP: 0010:[<ffffffff811297d9>]  [<ffffffff811297d9>]
> mem_cgroup_page_lruvec+0x79/0x90
> [35355.883056] RSP: 0000:ffff88003d523aa8  EFLAGS: 00010002
> [35355.883056] RAX: 0000000000000138 RBX: ffff88003fffa600 RCX: ffff88003e04a800
> [35355.883056] RDX: 0000000000000020 RSI: 0000000000000000 RDI: 0000000000028500
> [35355.883056] RBP: ffff88003d523ab8 R08: 0000000000000000 R09: 0000000000000000
> [35355.883056] R10: 0000000000000000 R11: dead000000100100 R12: ffffea0000a14000
> [35355.883056] R13: ffff88003e04b138 R14: ffff88003d523bb8 R15: ffffea0000a14020
> [35355.883056] FS:  0000000000000000(0000) GS:ffff88003fd80000(0000)
> knlGS:0000000000000000
> [35355.883056] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [35355.883056] CR2: 00000000000001a8 CR3: 0000000001a0b000 CR4: 00000000000006e0
> [35355.883056] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [35355.883056] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [35355.883056] Process kswapd0 (pid: 477, threadinfo ffff88003d522000,
> task ffff88003db6dc40)
> [35355.883056] Stack:
> [35355.883056]  0000000000000014 ffffea0000a14000 ffff88003d523b28
> ffffffff810ea4c5
> [35355.883056]  ffff88003d523b90 ffff88003fffa9c0 ffff88003d523b98
> 0000000000000020
> [35355.883056]  ffff88003fffa600 0000000200000003 ffff88003fffa600
> ffff88003d523b98
> [35355.883056] Call Trace:
> [35355.883056]  [<ffffffff810ea4c5>] move_active_pages_to_lru+0x65/0x190
> [35355.883056]  [<ffffffff810ec4e7>] shrink_active_list+0x297/0x380
> [35355.883056]  [<ffffffff810ebff6>] ? shrink_inactive_list+0x1a6/0x400
> [35355.883056]  [<ffffffff810ec815>] shrink_lruvec+0x245/0x4b0
> [35355.883056]  [<ffffffff810ecae6>] shrink_zone+0x66/0x180
> [35355.883056]  [<ffffffff810edcb4>] balance_pgdat+0x474/0x5b0
> [35355.883056]  [<ffffffff810edf58>] kswapd+0x168/0x440
> [35355.883056]  [<ffffffff8105d310>] ? abort_exclusive_wait+0xb0/0xb0
> [35355.883056]  [<ffffffff810eddf0>] ? balance_pgdat+0x5b0/0x5b0
> [35355.883056]  [<ffffffff8105c5fb>] kthread+0xbb/0xc0
> [35355.883056]  [<ffffffff8105c540>] ? __kthread_unpark+0x50/0x50
> [35355.883056]  [<ffffffff81748eac>] ret_from_fork+0x7c/0xb0
> [35355.883056]  [<ffffffff8105c540>] ? __kthread_unpark+0x50/0x50
> [35355.883056] Code: 89 50 08 48 89 d1 0f 1f 40 00 49 8b 04 24 48 89
> c2 48 c1 e8 38 83 e0 03 48 c1 ea 3a 48 69 c0 38 01 00 00 48 03 84 d1
> e0 02 00 00 <48> 3b 58 70 75 0a 48 8b 5d f0 4c 8b 65 f8 c9 c3 48 89 58
> 70 eb
> [35355.883056] RIP  [<ffffffff811297d9>] mem_cgroup_page_lruvec+0x79/0x90
> [35355.883056]  RSP <ffff88003d523aa8>
> [35355.883056] CR2: 00000000000001a8
> [35355.883056] ---[ end trace 2c9b8eec517f960d ]---
> 
> 
> --
> Thanks,
> //richard

-- 
Michal Hocko
SUSE Labs
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