From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Subject: Re: [linux-pm] PM: cannot hibernate -- BUG at kernel/workqueue.c:3659
Date: Tue, 24 Jan 2012 21:48:12 +0530
Message-ID: <4F1ED9C4.9020503@linux.vnet.ibm.com>
References: <4F1EC8D5.5040102@suse.cz>
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To: Jiri Slaby <jslaby@suse.cz>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>, Linux-pm mailing list <linux-pm@lists.linux-foundation.org>, LKML <linux-kernel@vger.kernel.org>, Jiri Slaby <jirislaby@gmail.com>
List-Id: linux-pm@vger.kernel.org

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?
 
Regards,
Srivatsa S. Bhat
IBM Linux Technology Center