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Xen hangs (NetBSD 7.0.1, amd64, Xen 4.5.3)

On my Xen box, I sometimes get a state where any "xl" command will just
hang (in such a way as to not respond to SIGTERM, SIGKILL, or even a ^Z
at the shell). Existing domUs are still running fine and can talk to the
network and their xbd disks and *existing* xl console sessions, but I
can't start new ones, or open new console connections.

xenconsoled and xenstored are both running (well, processes with those
names exist and are in the "select" state according to top); all my xl
processes are in state "tstile", and when I had a look this time, there
were two xenstore-rm processes and a xenstore-read around, also in the
tstile state:

root    13694  0.0  0.5 13092 1264 ?      I     3:04PM    0:00.00
xenstore-rm /local/domain/0/backend/vif/17/0
root    17011  0.0  0.5 13092 1260 ?      D     3:04PM    0:00.00
xenstore-read /local/domain/0/backend/vbd/17/0/params
root    25386  0.0  0.5 12064 1224 ?      D     3:04PM    0:00.00
xenstore-rm /local/domain/0/backend/vif/17/3

Any ideas what it might be? When it happens, the only cure seems to be
to ssh into the domUs that are running ssh (some are meant to be
accessed purely via xl console) and shut them down, then reboot dom0 and
restart everything :-(



Alaric Snell-Pym

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