Xen 33 panic while shutting down HVM guest

[Hugo Silva <hugo%barafranca.com@localhost>]

Just caught this one on the dom0 serial console before rebooting:

tap0: detached
tap1: detached
xbd backend: detach device dm0m for domain 9
xbd backend: detach device dm0n for domain 9
uvm_fault(0xffffffff80622de0, 0x0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff80217ff6 cs e030 rflags 10287 cr2  10 cpl
8 rsp ffffa0003c062af0
panic: trap
cpu0: Begin traceback...
?() at ffffa0003c062a00
?() at 8
?() at ffffa0003437f940
uvm_vnodeops() at netbsd:_prop_stack_push+0x5cafb
uvm_fault(0xffffffff805fca60, 0xfffffffffffff000, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff8014bdc7 cs e030 rflags 10246 cr2
fffffffffffffffa cpl 8 rsp ffffa0003c062040
Skipping crash dump on recursive panic
panic: trap
Faulted in mid-traceback; aborting...rebooting...
(XEN) Domain 0 shutdown: rebooting machine.


The machine had been up for days and survived a lot of vm
create/destroy.. did nothing different (xm shutdown $vm).