Bug#419209: lvm2: Hangs during snapshot creation
Jan.Kluka at fmph.uniba.sk
Thu Sep 24 14:02:34 UTC 2009
Another "me-too": We have been hit by what I believe is this bug.
We use LVM2 on top of MD (RAID1) and take snapshots of logical volumes
for backup. After a recent long-overdue upgrade to lenny, the very
first backup of /home (residing on its own logical volume) hung during
snapshot creation. Since the filesystem is xfs which has to be frozen
during snapshot creation, the whole system became unstable. Processes
remained blocked even after xfs was unfrozen, and could not be killed.
The only option was to hard-reset the box.
Perhaps xfs freezing (why is it necessary on a journaled filesystem
anyway?!) contributed to the damage. Nevertheless, snapshot creation
hang is a real problem, and has nothing to do with LVM2 deadlocking
itself when backing up configuration to /var. Also, it never happened
in 2.6.18 back in etch.
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