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[Xen-users] domu hangs?

I have domu hanging on 3 different pv domus.

All are dom0 and domu with Debian lenny.
It happens randomly roughly once a month.
There are no errors in the logs.
Can not ping domu.
xm console comes up but is unresponsive.
Have tried watch watchdog with softdog bit it does not help.
xm shutdown does not work.
Have to restart with xm destroy, xm create.
All have on_crash    = 'restart'  set.

dom0 64bit  xen   xen 3.4.2
domu  kernel 2.6.26-2-xen-amd64

System 2
intel  64 bit
dom0 64bit  xen   xen 3.4.2
domu  kernel 2.6.26-2-xen-amd64

System3 ( This system had some random hangs before going to xen so it could be 
intel 32 bit
dom0  2.6.26-2-xen-686 xen 3.2-1
domu  2.6.26-2-xen-686

While I'd like to fix it from hanging why doesn't xen restart it?
I remember the on_crash    = 'restart' working fine in the past.
What does on_crash look for?
Any ideas?


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