Fatal trap 12: page fault while in kernel mode

Hi,

while booting a 5.1REL kernel on that machine is fine, booting HEAD
results in...

--- cut ---
Copyright (c) 1992-2003 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD 5.1-CURRENT #0: Mon Jul 21 08:13:36 UTC 2003
    bz_at_xxxx.xxxxxxx.xx:/u2/src/obj/u2/src/HEAD/src/sys/HAUKI-20030718-01
Preloaded elf kernel "/boot/kernel/kernel" at 0xc0593000.
Preloaded elf module "/boot/kernel/linux.ko" at 0xc05930d8.
Preloaded elf module "/boot/kernel/snd_pcm.ko" at 0xc0593184.
Preloaded elf module "/boot/kernel/snd_ich.ko" at 0xc0593230.
Timecounter "i8254"  frequency 1193182 Hz
Timecounter "TSC"  frequency 996768803 Hz
CPU: Intel Pentium III (996.77-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x686  Stepping = 6
  Features=0x383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>
real memory  = 536870912 (512 MB)
avail memory = 515473408 (491 MB)
Pentium Pro MTRR support enabled
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcibios: BIOS version 2.10
Using $PIR table, 10 entries at 0xc00e8790
pcib0: <Intel 82815 (i815 GMCH) Host To Hub bridge> at pcibus 0 on motherboard
pci0: <PCI bus> on pcib0
pci_cfgintr: 0:31 INTD BIOS irq 10
pci_cfgintr: 0:31 INTB BIOS irq 11
agp0: <Intel 82815 (i815 GMCH) host to PCI bridge> mem 0x48000000-0x4bffffff at device 0.0 on pci0
pcib1: <PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1


Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x240
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xc0395ab4
stack pointer           = 0x10:0xc05b5836
frame pointer           = 0x10:0xc05b587a
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 0 (swapper)
kernel: type 12 trap, code=0
Stopped at      trap+0x414:     testb   $0x10,0x240(%eax)
db> x 0xc0395ab4
trap+0x414:     24080f6
db> trace
trap(b0018,58c00010,c05b0010,c150050a,c039d82d) at trap+0x414
calltrap() at calltrap+0x5
--- trap 0x9, eip = 0xc00e8a14, esp = 0xc05b58c2, ebp = 0xc05b58f4 ---
kernbase(c0381ece,8,c05b5940,0,1) at 0xc00e8a14
(null)(50a,c05b596c,c039d82d,c1507700,c1507500) at 0x80246
db> panic
panic: from debugger
Debugger("panic")


Fatal trap 3: breakpoint instruction fault while in kernel mode
instruction pointer     = 0x8:0xc0384734
stack pointer           = 0x10:0xc05b55b6
frame pointer           = 0x10:0xc05b55c2
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = IOPL = 0
current process         = 0 (swapper)
Stopped at      trap+0x414:     testb   $0x10,0x240(%eax)
db> reset
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done a gdb -k kernel.debug I get this:

--- cut ---
(kgdb) l *0xc0395ab4
0xc0395ab4 is in trap (/u2/src/HEAD/src/sys/i386/i386/trap.c:472).
467                                     break;
468
469                             /* FALL THROUGH */
470
471                     case T_SEGNPFLT:        /* segment not present fault */
472                             if (PCPU_GET(curpcb)->pcb_flags & PCB_VM86CALL)
473                                     break;
474
475                             /*
476                              * Invalid %fs's and %gs's can be created using
(kgdb) q
--- cut ---

Any ideas ? Anything I might try ?

PS: though calling panic I do not get crashdumps.

-- 
Greetings

Bjoern A. Zeeb				bzeeb at Zabbadoz dot NeT
56 69 73 69 74				http://www.zabbadoz.net/