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Kernel has been upgraded from 3.13.0-49 to 3.13.0-53, several minutes
after the first reboot with the new kernel I noticed high wio while
syslog was filling with messages listed below. When I tried to reboot
(shutdown -r) it posted reboot messages to all console windows and then
locked up - no reaction to keyboard, no ping response, had to powercycle
it. After the reboot back to 3.13.0-49 system works fine, although
filesystems were dirty. Didn't try it the second time - this system is
too important for experiments. It has been running on the same hardware
for a couple of years with no prior issues.

May 30 10:55:06 server kernel: [ 1702.612692] BUG: soft lockup - CPU#1 stuck for 22s! [kworker/u16:5:142]
May 30 10:55:06 server kernel: [ 1702.612704] Modules linked in: snd_hrtimer pci_stub vboxpci(OX) vboxnetadp(OX) vboxnetflt(OX) vboxdrv(OX) cuse dm_crypt bnep rfcomm bluetooth mxm_wmi snd_hda_codec_hdmi kvm_amd kvm serio_raw k10temp snd_hda_codec_realtek snd_hda_intel snd_hda_codec nvidia(POX) snd_hwdep snd_pcm snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer drm snd soundcore i2c_piix4 shpchp wmi binfmt_misc mac_hid parport_pc ppdev xfs lp libcrc32c parport raid10 raid1 raid0 multipath linear raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq pata_acpi hid_generic usbhid hid usb_storage tg3 sata_sil24 pata_atiixp firewire_ohci ptp firewire_core pps_core ahci pata_via crc_itu_t libahci ati_agp
May 30 10:55:06 server kernel: [ 1702.612833] CPU: 1 PID: 142 Comm: kworker/u16:5 Tainted: P           OX 3.13.0-53-generic #89-Ubuntu
May 30 10:55:06 server kernel: [ 1702.612839] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./990FX Extreme4, BIOS P1.30 09/13/2011
May 30 10:55:06 server kernel: [ 1702.612854] Workqueue: writeback bdi_writeback_workfn (flush-9:1)
May 30 10:55:06 server kernel: [ 1702.612863] task: efa0ce00 ti: f6030000 task.ti: f6030000
May 30 10:55:06 server kernel: [ 1702.612871] EIP: 0060:[<c165e148>] EFLAGS: 00000286 CPU: 1
May 30 10:55:06 server kernel: [ 1702.612880] EIP is at _raw_spin_unlock_irqrestore+0x18/0x40
May 30 10:55:06 server kernel: [ 1702.612887] EAX: 00000286 EBX: 00000286 ECX: 00000019 EDX: 00000286
May 30 10:55:06 server kernel: [ 1702.612893] ESI: e17b5560 EDI: f26c14a0 EBP: f6031c10 ESP: f6031c0c
May 30 10:55:06 server kernel: [ 1702.612898]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
May 30 10:55:06 server kernel: [ 1702.612903] CR0: 8005003b CR2: b77ca000 CR3: 01aa6000 CR4: 000007f0
May 30 10:55:06 server kernel: [ 1702.612908] Stack:
May 30 10:55:06 server kernel: [ 1702.612911]  e17b5550 f6031c28 c112bd7e 00000286 f26c14a0 009c8000 f26c14a0 f6031c34
May 30 10:55:06 server kernel: [ 1702.612927]  c112be0d cef88540 f6031cc4 f8910331 f6031c9c 00000003 00000001 00000000
May 30 10:55:06 server kernel: [ 1702.612941]  c29b3200 00000001 01674000 00000000 00000000 f6031e08 009c9000 00000000
May 30 10:55:06 server kernel: [ 1702.612956] Call Trace:
May 30 10:55:06 server kernel: [ 1702.612969]  [<c112bd7e>] __set_page_dirty_nobuffers+0x6e/0xe0
May 30 10:55:06 server kernel: [ 1702.612979]  [<c112be0d>] redirty_page_for_writepage+0x1d/0x20
May 30 10:55:06 server kernel: [ 1702.613046]  [<f8910331>] xfs_vm_writepage+0xa1/0x590 [xfs]
May 30 10:55:06 server kernel: [ 1702.613058]  [<c112af40>] __writepage+0x10/0x40
May 30 10:55:06 server kernel: [ 1702.613067]  [<c112af30>] ? global_dirtyable_memory+0xa0/0xa0
May 30 10:55:06 server kernel: [ 1702.613075]  [<c112b8b3>] write_cache_pages+0x1a3/0x3c0
May 30 10:55:06 server kernel: [ 1702.613084]  [<c112af30>] ? global_dirtyable_memory+0xa0/0xa0
May 30 10:55:06 server kernel: [ 1702.613094]  [<c10b9c99>] ? tick_program_event+0x29/0x30
May 30 10:55:06 server kernel: [ 1702.613104]  [<c112bb03>] generic_writepages+0x33/0x60
May 30 10:55:06 server kernel: [ 1702.613164]  [<f890f3fa>] xfs_vm_writepages+0x3a/0x50 [xfs]
May 30 10:55:06 server kernel: [ 1702.613173]  [<c112ca1a>] do_writepages+0x1a/0x40
May 30 10:55:06 server kernel: [ 1702.613182]  [<c119e90c>] __writeback_single_inode+0x3c/0x1f0
May 30 10:55:06 server kernel: [ 1702.613191]  [<c119f6fd>] writeback_sb_inodes+0x1bd/0x2e0
May 30 10:55:06 server kernel: [ 1702.613201]  [<c119f89c>] __writeback_inodes_wb+0x7c/0xb0
May 30 10:55:06 server kernel: [ 1702.613209]  [<c119fac2>] wb_writeback+0x1f2/0x270
May 30 10:55:06 server kernel: [ 1702.613219]  [<c11a0cc7>] bdi_writeback_workfn+0x177/0x370
May 30 10:55:06 server kernel: [ 1702.613228]  [<c165ace8>] ? __schedule+0x358/0x770
May 30 10:55:06 server kernel: [ 1702.613238]  [<c106eeab>] process_one_work+0x11b/0x3b0
May 30 10:55:06 server kernel: [ 1702.613246]  [<c106fae9>] worker_thread+0xf9/0x380
May 30 10:55:06 server kernel: [ 1702.613254]  [<c106f9f0>] ? rescuer_thread+0x380/0x380
May 30 10:55:06 server kernel: [ 1702.613262]  [<c1075391>] kthread+0xa1/0xc0
May 30 10:55:06 server kernel: [ 1702.613271]  [<c1665877>] ret_from_kernel_thread+0x1b/0x28
May 30 10:55:06 server kernel: [ 1702.613280]  [<c10752f0>] ? kthread_create_on_node+0x140/0x140
May 30 10:55:06 server kernel: [ 1702.613285] Code: 83 e8 01 75 f2 89 c8 89 f2 8d b6 00 00 00 00 eb e1 66 90 55 89 e5 53 3e 8d 74 26 00 89 d3 3e 8d 74 26 00 f0 80 00 02 89 d8 50 9d <8d> 74 26 00 5b 5d c3 90 0f b7 10 f0 80 00 02 f6 40 01 01 74 e7

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8.1
ProcVersionSignature: Ubuntu 3.13.0-49.83-generic 3.13.11-ckt17
Uname: Linux 3.13.0-49-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: i386
CurrentDesktop: KDE
Date: Sat May 30 13:25:15 2015
InstallationDate: Installed on 2011-08-18 (1380 days ago)
InstallationMedia: Kubuntu 11.04 "Natty Narwhal" - Release i386 (20110427)
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to trusty on 2014-10-18 (224 days ago)

** Affects: linux-lts-trusty (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 kubuntu trusty
-- 
BUG: soft lockup - CPU#1 stuck for 22s! [kworker/u16:5:142]
https://bugs.launchpad.net/bugs/1460284
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