Bug#419209: lvm2: Hangs during snapshot creation

[Philip D. Turner]

For what it's worth, a deadlock took one of our production systems  
running 2.6.26-1-amd64 down last night. We had four backups scheduled  
to kick off at the same time (probably not a good idea in the first  
place, eh?). Each backup takes a snapshot of a different logical  
volume. The endgame was that we could still ssh into the system but  
the applications were very unstable (I'm guessing this is the high CPU  
utilization previously reported) and the only way to recover was to  
reboot.

Phil Turner