double trap on reboot (kernel trap 0 with interrupts disabled)

Hi,

I started to randomly get those on reboot after I updated my HEAD
on 21st Dec. The last kernel was a day or two days old. There is
one change (which might or might not be the cause) I added puc(4)
to sys/amd64/GENERIC. am64 dual opteron system.

In case anyone has an idea I am willing to test patches.

Uptime: 23m14s
bge0: link DOWN
psmcpnp0: wake_prep disabled wake for \_SB_.PCI0.SIO_.PS2M (S5)
atkbdc0: wake_prep disabled wake for \_SB_.PCI0.SIO_.PS2K (S5)
sio0: wake_prep disabled wake for \_SB_.PCI0.SIO_.COM1 (S5)
sio1: wake_prep disabled wake for \_SB_.PCI0.SIO_.COM2 (S5)
unknown: wake_prep disabled wake for \_SB_.PCI0.USB0 (S5)
unknown: wake_prep disabled wake for \_SB_.PCI0.USB2 (S5)
Rebooting...
cpu_reset: Stopping other CPUs
kernel trap 0 with interrupts disabled


Fatal trap 0:  while in kernel mode
cpuid = 1; apic id = 01
instruction pointer     = 0xb580:0x0
stack pointer           = 0x10:0xffffffff8093b598
frame pointer           = 0x10:0xffffffff8093b520
code segment            = base 0x0, limit 0x0, type 0x0
                         = DPL 0, pres 0, long 0, def32 0, gran 0
processor eflags        = IOPL = 0
current process         = 10 (idle: cpu1)
kernel trap 2017143325 with interrupts disabled


Fatal trap 2017143325: UNKNOWN while in kernel mode
cpuid = 0; apic id = 00
instruction pointer     = 0x0:0xffffff00783b2b24
stack pointer           = 0x10:0xffffff00783b28b0
frame pointer           = 0x10:0xffffff00784d1000
code segment            = base 0x0, limit 0x0, type 0x0
                         = DPL 0, pres 0, long 0, def32 0, gran 0
processor eflags        = IOPL = 0
current process         = 1026 (reboot)


-- 
Bjoern A. Zeeb				bzeeb at Zabbadoz dot NeT