[linux-lvm] lvrename hanging on snapshots

[Dave Broudy]

When I try to run "lvrename vg00 usr_p0 usr_p1" the command hangs, the 
CPU goes to 100% utilization in wait state, and the whole system pretty 
much hangs (not completely, but enough that I can't do a clean shutdown 
and have to power cycle).

Prior to running this command vg00/usr_p0 exists and is a snapshot. 
vg00/usr_p1 does not exist.

All the other LVM operations I try work fine, including creating and 
removing snapshots. lvrename -t works, but obviously doesn't do anything.

I have managed to capture a strace as well as run lvm_dump.sh -a, and 
the results are here: http://www.broudy.net/lvrename/. The lvm_dump is 
not from when the system is hung.

The last thing in the strace is a couple of ioctls on 
/dev/mapper/control, DM_DEV_SUSPEND being the last.

Kernel is stock Debian Sarge 2.6.8-2-k7

LVM VERSION:
  LVM version:     2.01.04 (2005-02-09)
  Library version: 1.01.00-ioctl (2005-01-17)
  Driver version:  4.1.0
DEVICE MAPPER VERSION:
Library version:   1.01.00-ioctl (2005-01-17)
Driver version:    4.1.0

I'm more that will to debug this problem, try patches, etc, I reproduced 
this on a machine that isn't very critical. But I'm not sure what steps 
to take.

Thanks,
Dave

-- 
Dave Broudy
dave at broudy.net
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