PM: cannot hibernate -- BUG at kernel/workqueue.c:3659

[Jiri Slaby <jslaby@suse.cz>]

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 wanted to reproduce a different crash which happens on 3.2.1. When
there is not enough free swap, the kernel crashes (when s2disk is used).
I will post more info after the one above is resolved and I can
reproduce the latter :).

thanks,
-- 
js
suse labs