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[pepa65 <1096520@xxxxxxxxxxxxxxxxxx>]

OK, on a non-luks encrypted bog-standard lvm2 install of the latest trusty tahr.
Note: the original bug was already solved. The case where the output of the lv-snapshot creation is directed to a file on the volume being snapshotted is a mixed bag with the latest trusty tahr. The first time it went OK; the second time I used a single verbosity flag, and it hung:
lvcreate -v -s -p r -L 700M -n oscopy /dev/mapper/ubuntu--vg-root 2>/root/log
(Tried both a few times, no -v no hang, at least one -v and it hangs.)

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https://bugs.launchpad.net/bugs/1096520

Title:
  lvm2 hangs when creating snapshot of live root and IO to the root
  filesystem is happening

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  On Lucid LTS 10.04.4 with package linux-image-2.6.32-45-generic-pae 2.6.32-45.101 (2.6.32.45.52),
  also happens on linux-image-2.6.35-32-generic-pae 2.6.35-32.68~lucid1 (2.6.35.14)
  Root filesystem ext4 (e2fslibs 1.41.11-1ubuntu2.1) on lvm2 2.02.54-1ubuntu4.1,
  vg resides on luks-encrypted partition (cryptsetup 2:1.1.0~rc2-1ubuntu13)

  This might be a regression of bug 615911, bug 595489, bug 604807, bug 605551 - same symptoms:
  after lvcreate -s -p r -L 3G -n oscopy /dev/secret/ubuntu the system becomes unresponsive at the root filesystem becomes inaccessible. The lv is never properly created, but on reboot there are some vestiges that cannot be mounted (/dev/secret/oscopy).
  ---
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: i386
  ArecordDevices:
   XOpenDisplay() failed
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC662 rev1 Analog [ALC662 rev1 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  gdm        1869 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xfe700000 irq 49'
     Mixer name	: 'Realtek ALC662 rev1'
     Components	: 'HDA:10ec0662,103c2ac2,00100101'
     Controls      : 21
     Simple ctrls  : 13
  Card1.Amixer.info:
   Card hw:1 'Generic'/'HD-Audio Generic at 0xfe640000 irq 50'
     Mixer name	: 'ATI R6xx HDMI'
     Components	: 'HDA:1002aa01,00aa0100,00100200'
     Controls      : 4
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [off]
  DistroRelease: Ubuntu 10.04
  HibernationDevice: RESUME=UUID=03a0c90e-c2e3-4eaf-bab1-3160a73be6c1
  InstallationMedia: Ubuntu-Server 10.04.3 LTS "Lucid Lynx" - Release i386 (20110719.2)
  IwConfig:
   lo        no wireless extensions.

   eth0      no wireless extensions.
  MachineType: Hewlett-Packard p7-1022l
  Package: linux (not installed)
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.35-32-generic-pae root=/dev/mapper/secret-ubuntu ro quiet
  ProcEnviron:
   SHELL=/bin/bash
   LANG=en_US.UTF-8
  ProcVersionSignature: Ubuntu 2.6.35-32.68~lucid1-generic-pae 2.6.35.14
  Regression: Yes
  RelatedPackageVersions: linux-firmware 1.34.14
  Reproducible: Yes
  RfKill:

  Tags: lucid  regression-update needs-upstream-testing
  Uname: Linux 2.6.35-32-generic-pae i686
  UserGroups:

  dmi.bios.date: 07/04/2011
  dmi.bios.vendor: AMI
  dmi.bios.version: 7.11
  dmi.board.name: 2AC2
  dmi.board.vendor: PEGATRON CORPORATION
  dmi.board.version: 1.02A
  dmi.chassis.asset.tag: 4CE13108SV
  dmi.chassis.type: 3
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnAMI:bvr7.11:bd07/04/2011:svnHewlett-Packard:pnp7-1022l:pvr1.02A:rvnPEGATRONCORPORATION:rn2AC2:rvr1.02A:cvnHewlett-Packard:ct3:cvr:
  dmi.product.name: p7-1022l
  dmi.product.version: 1.02A
  dmi.sys.vendor: Hewlett-Packard

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