panic on acpi_cpu_c1()

[Norikatsu Shigemura]

Hi.

	I got a panic after AP CPU launched on boot.  So I couldn't get
	crash dump and information.

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FreeBSD nadesico.ninth-nine.com 8.0-CURRENT FreeBSD 8.0-CURRENT #49: Sun Jun 28 02:53:48 JST 2009     nork at nadesico.ninth-nine.com:/usr/obj/usr/src/sys/NADESICO  amd64
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SMP: AP CPU #3 Launched!
SMP: AP CPU #1 Launched!
SMP: AP CPU #2 Launched!

Fatal trap 30: reserved (unknown) fault while in kernel mode
cpuid = 3; apic id = 03
instruction pointer     = 0x20:0xffffffff804bce56
stack pointer           = 0x20:0xffffff8000039b60
frame pointer           = 0x20:0xffffff8000039b70
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, IOPL = 0
current process         = 11 (idle: cpu3)
[thread pid 11 tid 100003 ]
Stopped at      acpi_cpu_c1+0x6:        leave
db> bt
Tracing pid 11 tid 100003 td 0xffffff8001863720
acpi_cpu_c1() at acpi_cpu_c1+0x6
acpi_cpu_idle() at acpi_cpu_idle+0x20c
sched_idletd() at sched_idletd+0x123
fork_exit() at fork_exit+0x117
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffff8000039d40, rbp = 0 ---
db>
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	I can boot with kern.smp.diabled=1, so I get address lines.
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(kgdb) list *acpi_cpu_c1+0x6
0xffffffff804bce56 is in acpi_cpu_c1 (/usr/src/sys/amd64/acpica/acpi_machdep.c:100).
95
96      void
97      acpi_cpu_c1()
98      {
99              __asm __volatile("sti; hlt");
100     }
(kgdb) list *acpi_cpu_idle+0x20c
0xffffffff801b443c is in acpi_cpu_idle (/usr/src/sys/dev/acpica/acpi_cpu.c:966).
961         ACPI_ENABLE_IRQS();
962
963         /* Find the actual time asleep in microseconds. */
964         end_time = acpi_TimerDelta(end_time, start_time);
965         sc->cpu_prev_sleep = (sc->cpu_prev_sleep * 3 + PM_USEC(end_time)) / 4;
966     }
(kgdb) list *sched_idletd+0x123
0xffffffff8030b733 is in sched_idletd (/usr/src/sys/kern/sched_ule.c:2562).
2557                                    cpu_spinwait();
2558                            }
2559                    }
2560                    switchcnt = tdq->tdq_switchcnt + tdq->tdq_oldswitchcnt;
2561                    if (tdq->tdq_load == 0)
2562                            cpu_idle(switchcnt > 1);
2563                    if (tdq->tdq_load) {
2564                            thread_lock(td);
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