Panic on shutdown, r243674M

[Ed Maste]

On 29 November 2012 17:36, Ed Maste <emaste at freebsd.org> wrote:

> #14 0xffffffff80bfd226 in trap (frame=0xffffff800025e870)
>     at /home/emaste/src/head-ro/sys/amd64/amd64/trap.c:463
> #15 0xffffffff80be71a2 in calltrap () at /tmp/exception-N6d6io.s:179
> #16 0xffffffff808bb9c0 in rman_set_bustag ()
>     at /home/emaste/src/head-ro/sys/kern/subr_rman.c:941
> #17 0xffffffff80356c9d in acpi_cpu_idle ()
>     at /home/emaste/src/head-ro/sys/dev/acpica/acpi_cpu.c:1020
> #18 0xffffffff80beb268 in cpu_idle_acpi (busy=0)
>     at /home/emaste/src/head-ro/sys/amd64/amd64/machdep.c:685

FWIW I had a second instance of this panic.  Previous kernel is from
Nov. 14 (prior to the import of ACPICA 20121114) and it has been
stable.