Hi Alfred,

What will happen is during the extract process the install will hang. No
network IO happens and on the host I see bhyve's CPU hit 100% for each
core assigned.

For reference this is the bhyve command invoked via Neel's "vmrun.sh".

0 3915 3908 0 103 0 2122208 103428 - R+ 2 1048:45.75 /usr/sbin/bhyve -c
2 -m 2048 -M 0 -AI -H -P -g 0 -s 0:0,hostbridge -s 1:0,virtio-net,tap0
-s 2:0,virtio-blk,../freebsd-stable.img -s
3:0,virtio-blk,../FreeBSD-9.1-STABLE-amd64-20130216-r246877-bootonly.iso
-S 31,uart,stdio freebsd-stable

I tried to gdb the bhyve process but that was bad news. Is there a set
of steps usually taken to help pinpoint what is going on when we this
state?

Does the previous snapshot (r247640) work better ? The relevant change there was the recent virtio guest MFC.

 Some things to try:
  - boot bhyve uniprocessor
  - is the bhyve process performing any disk i/o, or is it just spinning ?
the bhyvectl program can dump a lot of vm state - you can try something like

     sudo bhyvectl --get-all --cpu=0 --vm=<your vm name>
     sudo bhyvectl --get-all --cpu=1 --vm=<your vm name>

If you do this repeatedly, it may be possible to see some patterns e.g. counters incrementing, %RIP values being the same etc.

Regarding gdb and bhyve, for debugging I usually start bhyve under gdb in the foreground and send output to another pty with the gdb "set tty" command (note the other pty should have a 'sleep 100000' command run to avoid input being captured) - this way, a ctl-C in the gdb session will drop into gdb and allow breakpoints to be set etc.

later,

Peter.
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