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[Craig <1115753@xxxxxxxxxxxxxxxxxx>]

Reproduced the bug.  Again, just to repeat so as to avoid any confusion:
I have not updated the BIOS yet.  I will do that next.

The lockup is a little different now.  Whereas previously the system
would hang before any of the snapshots were removed, now some of the
snapshots are successfully umount'd and lvremove'd before the hang.
This could be the result of changes made to the script that does the
umount and lvremove, reordering the sequence of the snapshots, which
consist of home, root, and var partitions.  Another difference in the
current lockup behavior is that there are some messages logged to
syslog, whereas previously no messages made it into the log.
Previously, the messages were only present as scrolling text on the
terminal console.  The messages that now appear in syslog are:

Sep 20 02:54:35 brain udevd[25253]: inotify_add_watch(6, /dev/dm-6, 10) failed: No such file or directory
Sep 20 02:54:35 brain udevd[25253]: inotify_add_watch(6, /dev/dm-6, 10) failed: No such file or directory
Sep 20 02:54:37 brain udevd[25253]: inotify_add_watch(6, /dev/dm-9, 10) failed: No such file or directory
Sep 20 02:54:37 brain udevd[25253]: inotify_add_watch(6, /dev/dm-9, 10) failed: No such file or directory
Sep 20 02:55:05 brain kernel: [72016.336022] BUG: soft lockup - CPU#3 stuck for 22s! [udisks-lvm-pv-e:26148]
Sep 20 02:55:05 brain kernel: [72016.336026] Modules linked in: dm_snapshot nls_iso8859_1 nls_cp437 vfat fat pci_stub vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) rpcsec_gss_krb5 ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp kvm_amd kvm nvidia(P) snd_hda_codec_hdmi bnep rfcomm bluetooth snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep usblp snd_pcm snd_seq_midi snd_rawmidi pl2303 usbserial snd_seq_midi_event parport_pc joydev ppdev snd_seq cdc_acm snd_timer snd_seq_device snd amd64_edac_mod edac_core it87 psmouse hwmon_vid fam15h_power sp5100_tco k10temp i2c_piix4 soundcore eeepc_wmi edac_mce_amd dm_multipath nfsd shpchp asus_wmi snd_page_alloc nfs sparse_keymap mxm_wmi serio_raw wmi lp mac_hid lockd fscache auth_rpcgss nfs_acl sunrpc parport binfmt_misc dm_crypt vesafb usbhid hid usb_storage aic79xx e1000e [last u
Sep 20 02:55:05 brain kernel: nloaded: ipmi_msghandler]
Sep 20 02:55:05 brain kernel: [72016.336088] CPU 3 
Sep 20 02:55:05 brain kernel: [72016.336089] Modules linked in: dm_snapshot nls_iso8859_1 nls_cp437 vfat fat pci_stub vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) rpcsec_gss_krb5 ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp kvm_amd kvm nvidia(P) snd_hda_codec_hdmi bnep rfcomm bluetooth snd_hda_codec_realtek snd_hda_intel snd_hda_codec snSep 20 08:31:02 brain kernel: imklog 5.8.6, log source = /proc/kmsg started.

After the above messages in syslog, the next message in the log is from
startup after reboot.

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https://bugs.launchpad.net/bugs/1115753

Title:
  Umount of Multiple LVM Snapshots Causes  'soft lockup CPU#0 stuck for'

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Simultaneous umount of multiple lvm snapshots causes system to hang /
  freeze / deadlock.  Window manager freezes.  If umount is executed in
  a non window-manager tty,  messages containing "BUG", "blocked for
  more than xx seconds", and a list of tasks associated with each of the
  8 cpu cores will scroll up at regular intervals.  The tasks assigned
  to each cpu core are unchanging over time, appearing to be deadlocked.
  No relevant information is left in system logs.  Hard reset / poweroff
  is required.  Problem does not occur 100% of the time.  It is less
  likely to occur if umount is done shortly after mount.  Problem still
  occurs -- but less frequently -- if lazy umount -l is used.  Snapshots
  are read-only, and are mounted read-only.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-37-generic 3.2.0-37.58
  ProcVersionSignature: Ubuntu 3.2.0-37.58-generic 3.2.35
  Uname: Linux 3.2.0-37-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  craig      3257 F.... pulseaudio
   /dev/snd/controlC0:  craig      3257 F.... pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  Card0.Amixer.info:
   Card hw:0 'SB'/'HDA ATI SB at 0xfeb00000 irq 16'
     Mixer name	: 'Realtek ALC889'
     Components	: 'HDA:10ec0889,1043846b,00100004'
     Controls      : 49
     Simple ctrls  : 24
  Card1.Amixer.info:
   Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfea30000 irq 98'
     Mixer name	: 'ATI R6xx HDMI'
     Components	: 'HDA:1002aa01,00aa0100,00100100'
     Controls      : 6
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Mon Feb  4 18:58:37 2013
  HibernationDevice: RESUME=UUID=b788f786-ba76-4eb0-991f-d3bbc339d3f7
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
  MachineType: To be filled by O.E.M. To be filled by O.E.M.
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-37-generic root=/dev/mapper/volgroup0-root ro
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-37-generic N/A
   linux-backports-modules-3.2.0-37-generic  N/A
   linux-firmware                            1.79.1
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to precise on 2012-10-23 (104 days ago)
  dmi.bios.date: 09/27/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0813
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Crosshair V Formula
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0813:bd09/27/2011:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKComputerINC.:rnCrosshairVFormula:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: To be filled by O.E.M.

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