Now that is interesting: after getting the system into a similar hang on the second execution of the vol-test script, I took a dump and was looking at it. The system would be suspended for the duration of the dump process, that is maybe 1 minute. After a while I suddenly noticed disk activity on the host and the guest which before seemed unresponsive, suddenly was actually doing the snapshot delete. According to timestamps, this took about 47 minutes!
Now that is interesting: after getting the system into a similar hang on the second execution of the vol-test script, I took a dump and was looking at it. The system would be suspended for the duration of the dump process, that is maybe 1 minute. After a while I suddenly noticed disk activity on the host and the guest which before seemed unresponsive, suddenly was actually doing the snapshot delete. According to timestamps, this took about 47 minutes!