linux-kernel - Re: [linux-pm] PM: cannot hibernate -- BUG at kernel/workqueue.c:3659

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Date:	Wed, 25 Jan 2012 01:04:39 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Jiri Slaby <jslaby@...e.cz>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] PM: cannot hibernate -- BUG at kernel/workqueue.c:3659

On 01/25/2012 12:02 AM, Rafael J. Wysocki wrote:
> On Tuesday, January 24, 2012, Jiri Slaby wrote:
>> On 01/24/2012 11:36 PM, Rafael J. Wysocki wrote:
>>> On Tuesday, January 24, 2012, Jiri Slaby wrote:
>>>> On 01/24/2012 05:18 PM, Srivatsa S. Bhat wrote:
>>>>> Hi Jiri,
>>>>>
>>>>> On 01/24/2012 08:35 PM, Jiri Slaby wrote:
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> this is a freshly booted system. When I do s2dsk, I see:
>>>>>> ...
>>>>>> Freezing remaining freezable tasks ... BUG: 'workqueue_freezing' is true!
>>>>>> ------------[ cut here ]------------
>>>>>> kernel BUG at /l/latest/linux/kernel/workqueue.c:3659!
>>>>>> invalid opcode: 0000 [#1] SMP
>>>>>> CPU 0
>>>>>> Modules linked in:
>>>>>>
>>>>>> Pid: 2669, comm: s2disk Not tainted 3.3.0-rc1-next-20120124_64+ #1627
>>>>>> Bochs Bochs
>>>>>> RIP: 0010:[<ffffffff8107e365>]  [<ffffffff8107e365>]
>>>>>> freeze_workqueues_begin+0x195/0x1a0
>>>>>> RSP: 0018:ffff880046f01d68  EFLAGS: 00010292
>>>>>> RAX: 0000000000000023 RBX: 0000000000000001 RCX: 00000000000000c9
>>>>>> RDX: 0000000000000077 RSI: 0000000000000046 RDI: ffffffff81b51f7c
>>>>>> RBP: ffff880046f01d98 R08: ffffffff81a9d760 R09: 0000000000000000
>>>>>> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
>>>>>> R13: 00007fff579464dc R14: ffffffffffffffff R15: 0000000000000004
>>>>>> FS:  00007f3c65d54700(0000) GS:ffff880049600000(0000) knlGS:0000000000000000
>>>>>> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
>>>>>> CR2: 00007f3c64f58c20 CR3: 0000000045b64000 CR4: 00000000000006f0
>>>>>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>>>>>> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>>>>>> Process s2disk (pid: 2669, threadinfo ffff880046f00000, task
>>>>>> ffff880047251980)
>>>>>> Stack:
>>>>>>  ffff880046f01d98 0000000000000001 0000000000000000 00007fff579464dc
>>>>>>  ffffffffffffffff 0000000000000004 ffff880046f01e18 ffffffff81096cb9
>>>>>>  00000000ffff0124 0000000000000004 ffff880046f01e18 000000004f1ec7d1
>>>>>> Call Trace:
>>>>>>  [<ffffffff81096cb9>] try_to_freeze_tasks+0x1b9/0x2d0
>>>>>>  [<ffffffff81096ed5>] freeze_kernel_threads+0x25/0x90
>>>>>>  [<ffffffff81097b55>] hibernation_snapshot+0x75/0x2e0
>>>>>>  [<ffffffff8109d724>] snapshot_ioctl+0x314/0x4e0
>>>>>>  [<ffffffff81130856>] do_vfs_ioctl+0x96/0x550
>>>>>>  [<ffffffff8111ff7b>] ? vfs_write+0x10b/0x180
>>>>>>  [<ffffffff81130d5a>] sys_ioctl+0x4a/0x80
>>>>>>  [<ffffffff81630e22>] system_call_fastpath+0x16/0x1b
>>>>>> Code: c7 c6 0a a4 92 81 48 c7 c7 16 65 92 81 31 c0 e8 19 94 5a 00 0f 0b
>>>>>> 48 c7 c6 27 a4 92 81 48 c7 c7 16 65 92 81 31 c0 e8 02 94 5a 00 <0f> 0b
>>>>>> 66 0f 1f 84 00 00 00 00 00 55 48 c7 c7 82 4b b9 81 48 89
>>>>>> RIP  [<ffffffff8107e365>] freeze_workqueues_begin+0x195/0x1a0
>>>>>>  RSP <ffff880046f01d68>
>>>>>> ---[ end trace 632574abdc098963 ]---
>>>>>>
>>>>>
>>>>>
>>>>> I couldn't find any obvious root-cause from a quick check. Is this completely
>>>>> reproducible upon a fresh boot?
>>>>
>>>> True.
>>>>
>>>> The cause is that the function is called twice:
>>>
>>> Which function?
>>
>> The one where the BUG is. Maybe the functions which should clear the
>> flag is not called in between? See:
>>
>>>>  [<ffffffff8107e206>] freeze_workqueues_begin+0x36/0x1b0
>>                          ^^^^^^^^^^^^^^^^^^^^^^^
>>>>  [<ffffffff81096cc9>] try_to_freeze_tasks+0x1b9/0x2d0
>>>>  [<ffffffff81096ee5>] freeze_kernel_threads+0x25/0x90
>>>>  [<ffffffff81097b65>] hibernation_snapshot+0x75/0x2e0
>>>>  [<ffffffff8109d734>] snapshot_ioctl+0x314/0x4e0
>>>>  [<ffffffff81130866>] do_vfs_ioctl+0x96/0x550
>>>>  [<ffffffff8111ff8b>] ? vfs_write+0x10b/0x180
>>>>  [<ffffffff81130d6a>] sys_ioctl+0x4a/0x80
>>>>  [<ffffffff81630e22>] system_call_fastpath+0x16/0x1b
>>>> (elapsed 0.03 seconds) done.
>> ...
>>>> Freezing remaining freezable tasks ... BUG: 'workqueue_freezing' is true!
>>>> ------------[ cut here ]------------
>>>> kernel BUG at /l/latest/linux/kernel/workqueue.c:3659!
>> ...
>>>> RIP: 0010:[<ffffffff8107e371>]  [<ffffffff8107e371>
>>>> freeze_workqueues_begin+0x1a1/0x1b0
>>    ^^^^^^^^^^^^^^^^^^^^^^^
>>>> Call Trace:
>>>>  [<ffffffff81096cc9>] try_to_freeze_tasks+0x1b9/0x2d0
>>>>  [<ffffffff81096ee5>] freeze_kernel_threads+0x25/0x90
>>>>  [<ffffffff81097b65>] hibernation_snapshot+0x75/0x2e0
>>>>  [<ffffffff8109d734>] snapshot_ioctl+0x314/0x4e0
>>>>  [<ffffffff81130866>] do_vfs_ioctl+0x96/0x550
>>>>  [<ffffffff8111ff8b>] ? vfs_write+0x10b/0x180
>>>>  [<ffffffff81130d6a>] sys_ioctl+0x4a/0x80
>>>>  [<ffffffff81630e22>] system_call_fastpath+0x16/0x1b
> 
> Ah.  So this is linux-next, right?

Right.

> Can you please test the linux-next branch of the linux-pm tree and see if
> the problem is reproducible in there?

Yeah, 100%. Just try it with a small enough swap.

thanks,
-- 
js
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