Public bug reported:
Binary package hint: lvm2
LVM cannot create a snapshot of a LUKS encrypted volume.
To reproduce:
1. Install Ubuntu 10.04 Lucid Lynx to a LUKS root using the alternate
installer.
2. Run: lvcreate --snapshot /dev/vg00/root --size 2G --name backup --verbose
This hangs the system. Verbose lvcreate messages are normal. The last
line printed is:
Suspending vg00-root (252:1) with filesystem sync with device flush
The console error is:
[360:540149] INFO: task flush-252:1:486 blocked for more than 120 seconds.
[360:609736] INFO: task lvcreate:1320 blocked for more than 120 seconds.
These console messages periodically repeat, but lvcreate never returns
and the system becomes unresponsive and requires a hard reset.
The snapshot volume is created and is visible after boot, but it seems
to be corrupt:
# mount /dev/vg00/backup /mnt
mount: unknown filesystem type 'DM_snapshot_cow'
** Affects: lvm2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: crash cryptsetup hang luks lvcreate lvm snapshot
--
creating a LUKS snapshot hangs the system
https://bugs.launchpad.net/bugs/615911
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