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 _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/linux-pm
