hang when creating lvm snapshot

[Patrick Pfeifer]

Since the update to kernel

linux-image-2.6.32-24-generic

on my amd64 system, with a dm-crypt -mapped harddisk with lvm layered on top of dm-crypt, the system often hangs (any applications doing disk i/o get blocked forever) when I try to create a snapshot - only way is to hard reset.

launchpad bug #595489 looks very similar

i'm attaching 2 dmesg outputs with output by the kernel after applications beeing blocked for more than 120s ....

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-24-generic 2.6.32-24.38
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.32-24.38-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: pat 3341 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xfe020000 irq 16'
   Mixer name : 'Realtek ALC883'
   Components : 'HDA:10ec0883,10438232,00100002'
   Controls : 38
   Simple ctrls : 21
Date: Fri Jul 30 10:43:17 2010
HibernationDevice: RESUME=/dev/mapper/babar-swap
MachineType: System manufacturer System Product Name
ProcCmdLine: BOOT_IMAGE=/hostname/vmlinuz initrd=/hostname/initrd.img quiet splash root=/dev/mapper/hostname-linux ro acpi_enforce_resources=lax --
ProcEnviron:
 LC_TIME=C
 LC_COLLATE=C
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.34.1
RfKill:
 0: hci0: Bluetooth
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
dmi.bios.date: 03/28/2008
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: ASUS M2A-VM ACPI BIOS Revision 1705
dmi.board.name: M2A-VM
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: 1.XX
dmi.chassis.asset.tag: 123456789000
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvrASUSM2A-VMACPIBIOSRevision1705:bd03/28/2008:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM2A-VM:rvr1.XX:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

[Patrick Pfeifer (patrick2000)]

i was able to capture the dmesg's to another lvm logical volume disk despite i/o beeing blocked on the lvm locical volume that i was trying to take a snapshot of, like so

sudo lvcreate -s -n data.snap -l100%FREE /dev/babar/data
sudo lvcreate -s -n home.snap -l100%FREE /dev/babar/home

i have 225 lvm physical extents free at the end of the disk and the snapshots used to work like a charm in linux-2.6.32-22 (and -23 as well, i think)

judging from the diff from -22 to -24 it could be something about ext4...

btw... why is the linux_2.6.32-23.37.diff.gz not available in archive.ubuntu.com ???

[Patrick Pfeifer (patrick2000)]

Next, I am compiling an upstream kernel...

[Stefan Bader (smb)]

On 07/30/2010 11:41 AM, Patrick Pfeifer wrote:
> btw... why is the linux_2.6.32-23.37.diff.gz not available in
> archive.ubuntu.com ???
>
That version has been replaced by -24.38. -22.36 is only there because it was a
security update and -21.32 is retained as the initial release. Versions in
updates usually are replaced by the versions from proposed when they are released.