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SubjectRe: [linux-pm] PM: cannot hibernate -- BUG at kernel/workqueue.c:3659
On 01/25/2012 05:40 AM, Rafael J. Wysocki wrote:

> On Wednesday, January 25, 2012, Jiri Slaby wrote:
>> 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.
>
> Ah, thanks, so that's an error code path problem and most likely in the Linus'
> tree.
>
> Srivatsa, any ideas?
>


Ok, I will need to quote a part of the userspace utility to explain the
problem.

In suspend.c inside the suspend-utils userspace package, I see a loop such
as:

error = freeze(snapshot_fd);
...
attempts = 2;
do {
if (set_image_size(snapshot_fd, image_size)) {
error = errno;
break;
}
if (atomic_snapshot(snapshot_fd, &in_suspend)) {
error = errno;
break;
}
if (!in_suspend) {
/* first unblank the console, see console_codes(4) */
printf("\e[13]");
printf("%s: returned to userspace\n", my_name);
free_snapshot(snapshot_fd);
break;
}

error = write_image(snapshot_fd, resume_fd, -1);
if (error) {
free_swap_pages(snapshot_fd);
free_snapshot(snapshot_fd);
image_size = 0;
error = -error;
if (error != ENOSPC)
break;
} else {
splash.progress(100);
#ifdef CONFIG_BOTH
if (s2ram_kms || s2ram) {
/* If we die (and allow system to continue)
* between now and reset_signature(), very bad
* things will happen. */
error = suspend_to_ram(snapshot_fd);
if (error)
goto Shutdown;
reset_signature(resume_fd);
free_swap_pages(snapshot_fd);
free_snapshot(snapshot_fd);
if (!s2ram_kms)
s2ram_resume();
goto Unfreeze;
}
Shutdown:
#endif
close(resume_fd);
suspend_shutdown(snapshot_fd);
}
} while (--attempts);

...
Unfreeze:
unfreeze(snapshot_fd);


Let me reply to this thread so that I can comment on the above code.

Regards,
Srivatsa S. Bhat



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