[bitfolk] [Slightly O/T] Xen machine hanging on reboot

Hi, The following applies to a Xen installation on my own hardware, not Bitfolk VMs. I have therefore marked it O/T. I hope nobody minds. I've tried the Xen-Users list and not had any luck. The install is an Ubuntu 12.04-x64 host with two Ubuntu 12.04-x64 guests and one Windows server 2008 R2 guest with the signed PV drivers. I'm using the XL toolkit. I'm suffering an issue where the machine gets stuck at the "Will now reboot" line when the host is rebooted while the guests are still running. If I shut all the guests down using "xl shutdown" the guests do terminate properly (after about 30 seconds). If I then do a reboot on the host, it completes cleanly. If I don't shutdown the guests, I have observed some possibly strange behaviour during the host shutdown before it hangs. In the shutdown progress I see: The things I think are strange are that the two Linux guests are listed twice in the shutdown line despite each only being running once and that it blows straight through the line saying "[done]" without waiting for the guests to terminate. It then appears to unmount the discs before all the guests have wrapped up so they never do terminate. If I leave it, I get repeated kernel warnings that the reboot process has been delayed for more than 120 seconds. I waited over 300 seconds (the time specified in XENDOMAINS_STOP_MAXWAIT) but it doesn't time out and recover. My xendomains file contains: XENDOMAINS_SYSRQ="" XENDOMAINS_USLEEP=100000 XENDOMAINS_CREATE_USLEEP=5000000 XENDOMAINS_MIGRATE="" XENDOMAINS_SAVE= XENDOMAINS_SHUTDOWN="--halt --wait" XENDOMAINS_SHUTDOWN_ALL="--all --halt --wait" XENDOMAINS_RESTORE=false XENDOMAINS_AUTO=/etc/xen/auto XENDOMAINS_AUTO_ONLY=false XENDOMAINS_STOP_MAXWAIT=300 I disabled the save and restore options because I am using PCI passthrough and trying to restore a saved VM caused the machine to crash at boot. I'm wondering if these problems are something to do with me using xl as most of the examples and references to the settings mention xm. Do you have any suggestions why this hanging or why the "--wait" in xendomains doesn't seem to be having any effect please? Thanks, Paul.