panic on boot

[Daniel Braniss]

the hardware is Sun Fire X2200 M2, and it's discless, PXE booted.

this seems to have started sometime before 8.2, and it
'sometimes happens':

FreeBSD 8.2-PRERELEASE #15 r4274: Wed Dec 22 09:11:27 IST 2010c40, rbp = 
0xffffffff80ef5c60 ---
    danny at rnd:/home/obj/rnd/r+d/stable/8/sys/HUJI amd64
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Dual-Core AMD Opteron(tm) Processor 2218 (2613.40-MHz K8-class CPU)
  Origin = "AuthenticAMD"  Id = 0x40f13  Family = f  Model = 41  Stepping = 3
  Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,
CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT>
  Features2=0x2001<SSE3,CX16>
  AMD Features=0xea500800<SYSCALL,NX,MMX+,FFXSR,RDTSCP,LM,3DNow!+,3DNow!>
  AMD Features2=0x1f<LAHF,CMP,SVM,ExtAPIC,CR8>
...
SMP: AP CPU #3 Launched!
(cd0:ata0:0:0:0): SCSI status: Check Condition
cpu3 AP:
(cd0:ata0:0:0:0): SCSI sense: NOT READY asc:3a,0 (Medium not present)
     ID: 0x03000000   VER: 0x80050010 LDR: 0x00000000 DFR: 0xffffffff
(cd0:  lint0: 0x00010700 lint1: 0x00000400 TPR: 0x00000000 SVR: 0x000001ff
ata0:0:  timer: 0x000200ef therm: 0x00010000 err: 0x000000f00: pmc: 0x000104000): 
Error 6, Unretryable error
SMP: AP CPU #2 Launched!
cd0 at ata0 bus 0 scbus0 target 0 lun 0
cpu2 AP:
cd0:      ID: 0x02000000   VER: 0x80050010 LDR: 0x00000000 DFR: 0xffffffff
<TEAC DV-28E-N P.6A> Removable CD-ROM SCSI-0 device 
  lint0: 0x00010700 lint1: 0x00000400 TPR: 0x00000000 SVR: 0x000001ff
cd0: 33.300MB/s transfers  timer: 0x000200ef therm: 0x00010000 err: 0x000000f0 ( pmc: 0x00010400UDMA2, 
ATAPI 12bytes, ioapic0: routing intpin 3 (PIO 65534bytesISA IRQ 3)) to lapic 1 vector 48
f
loiwotaapbilce0 :c lreoaunteirn gs tianrttpeidn
 4 (cd0: Attempt to query device size failed: NOT READY, Medium not present
ISA IRQ 4) to lapic 2 vector 48
ioapic0: routing intpin 9 (ISA IRQ 9) to lapic 3 vector 48
ioapic0: routing intpin 15 (ISA IRQ 15) to lapic 1 vector 49
ioapic0: routing intpin 17 (PCI IRQ 17) to lapic 2 vector 49
ioapic0: routing intpin 18 (PCI IRQ 18) to lapic 3 vector 49
ioapic0: routing intpin 22 (PCI IRQ 22) to lapic 1 vector 50
ioapic0: routing intpin 23 (PCI IRQ 23) to lapic 2 vector 50
kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x10
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff808b1581
stack pointer           = 0x28:0xffffffff80ef5b20
frame pointer           = 0x28:0xffffffff80ef5b50
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = resume, IOPL = 0
current process         = 0 (swapper)
trap number             = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
kdb_backtrace() at kdb_backtrace+0x37
panic() at panic+0x187
trap_fatal() at trap_fatal+0x290
trap_pfault() at trap_pfault+0x28f
trap() at trap+0x3df
calltrap() at calltrap+0x8
--- trap 0xc, rip = 0xffffffff808b1581, rsp = 0xffffffff80ef5b20, rbp = 0xffffffff80ef5b50 ---
intr_execute_handlers() at intr_execute_handlers+0x21
lapic_handle_intr() at lapic_handle_intr+0x37
Xapic_isr1() at Xapic_isr1+0xa5
--- interrupt, rip = 0xffffffff808b6cf3, rsp = 0xffffffff80ef5c40, rbp = 0xffffffff80ef5c60 ---
spinlock_exit() at spinlock_exit+0x33
ioapic_assign_cpu() at ioapic_assign_cpu+0x123
intr_shuffle_irqs() at intr_shuffle_irqs+0x9d
mi_startup() at mi_startup+0x77
btext() at btext+0x2c
Uptime: 2s