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[Uli Middelberg <uli@xxxxxxxxxxxxx>]

5cbb3d216e2041700231bcfc383ee5f8b7fc8b74: bug

[  908.144025] BUG: soft lockup - CPU#0 stuck for 22s! [md3_raid1:173]
[  908.144025] Modules linked in: xt_multiport iptable_filter ip_tables x_tables gpio_ich snd_hda_codec_realtek coretemp snd_hda_intel serio_raw snd_hda_codec pl2303 usbserial snd_hwdep usblp i915 lpc_ich snd_pcm drm_kms_helper snd_page_alloc video drm snd_timer snd mac_hid i2c_algo_bit soundcore parport_pc ppdev lp parport dm_snapshot raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor ahci psmouse raid6_pq raid1 raid0 libahci r8169 sata_via multipath mii linear
[  908.144025] CPU: 0 PID: 173 Comm: md3_raid1 Not tainted 3.12.0-031200-generic #201409241615
[  908.144025] Hardware name:                  /D945GSEJT, BIOS JT94510H.86A.0045.2010.0519.1750 05/19/2010
[  908.144025] task: f6af26d0 ti: f6b82000 task.ti: f6b82000
[  908.144025] EIP: 0060:[<c12f881d>] EFLAGS: 00000297 CPU: 0
[  908.144025] EIP is at memcmp+0x2d/0x60
[  908.144025] EAX: ecdcf000 EBX: 00000090 ECX: 00000270 EDX: ed369000
[  908.144025] ESI: 000000a7 EDI: 00000fff EBP: f6b83ea4 ESP: f6b83e94
[  908.144025]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[  908.144025] CR0: 8005003b CR2: b91bb5dc CR3: 01acb000 CR4: 000007f0
[  908.144025] Stack:
[  908.144025]  00000000 0000000b 00001000 00000084 f6b83ee8 f85d42e3 ed369000 00000001
[  908.144025]  0000000f f6b04800 0000000c ecc0e600 f6982d00 f50fd9e0 0000000c ecc0fa00
[  908.144025]  0000001c ed263000 00000002 ed263000 f6b04800 f6b83f08 f85d4597 f6b04800
[  908.144025] Call Trace:
[  908.144025]  [<f85d42e3>] process_checks+0x173/0x300 [raid1]
[  908.144025]  [<f85d4597>] sync_request_write+0x127/0x160 [raid1]
[  908.144025]  [<f85d6222>] raid1d+0x102/0x140 [raid1]
[  908.144025]  [<c1510d24>] md_thread+0xe4/0x110
[  908.144025]  [<c1095340>] ? __wake_up_sync+0x20/0x20
[  908.144025]  [<c1510c40>] ? md_rdev_init+0x100/0x100
[  908.144025]  [<c1077ebb>] kthread+0x9b/0xb0
[  908.144025]  [<c1674a77>] ret_from_kernel_thread+0x1b/0x28
[  908.144025]  [<c1077e20>] ? flush_kthread_worker+0x90/0x90
[  908.144025] Code: e5 57 56 53 83 ec 04 85 c9 c7 45 f0 00 00 00 00 74 29 0f b6 30 0f b6 1a 29 de 89 75 f0 75 1c 8d 79 ff 31 c9 eb 11 0f b6 74 08 01 <0f> b6 5c 0a 01 83 c1 01 29 de 75 0f 39 f9 75 eb 8b 45 f0 83 c4

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https://bugs.launchpad.net/bugs/1356558

Title:
  BUG: soft lockup - CPU stuck for 22s! [md3_raid1]

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  this bug appeared in Ubuntu 14.04, Ubuntu 12.04 didn't show this behavior. 
  I've found a possible predecessor in bug #212684.
  Switching to a recent mainline kernel didn't fix this issue.

  Starting

   $ /usr/share/mdadm/checkarray /dev/md3

  will repeat this behavior.

  /dev/md3 is a LVM PV:

    --- Physical volume ---
    PV Name               /dev/md3
    VG Name               local_vg1
    PV Size               1.36 TiB / not usable 2.25 MiB
    Allocatable           yes 
    PE Size               4.00 MiB
    Total PE              355619
    Free PE               31011
    Allocated PE          324608

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-33-generic 3.13.0-33.58
  ProcVersionSignature: Ubuntu 3.13.0-33.58-generic 3.13.11.4
  Uname: Linux 3.13.0-33-generic i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.13.0-33-generic.
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: i386
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
  Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
  Date: Wed Aug 13 21:42:12 2014
  HibernationDevice: RESUME=UUID=c4a03c5e-f650-4ca8-9dab-f0c4ad12c901
  InstallationDate: Installed on 2014-07-06 (37 days ago)
  InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release i386 (20140416.2)
  IwConfig:
   lo        no wireless extensions.
   
   em1       no wireless extensions.
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-33-generic root=UUID=9c2715cb-dd8a-4687-9537-009e1e4e83d8 ro nomdmonddf nomdmonisw
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-33-generic N/A
   linux-backports-modules-3.13.0-33-generic  N/A
   linux-firmware                             1.127.5
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/19/2010
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: JT94510H.86A.0045.2010.0519.1750
  dmi.board.name: D945GSEJT
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAE57850-300
  dmi.chassis.type: 3
  dmi.modalias: dmi:bvnIntelCorp.:bvrJT94510H.86A.0045.2010.0519.1750:bd05/19/2010:svn:pn:pvr:rvnIntelCorporation:rnD945GSEJT:rvrAAE57850-300:cvn:ct3:cvr:

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