Thanks for the response!

OK, I tried this again using a new vmcore and got something more useful:

Unread portion of the kernel message buffer:
sis0: discard frame w/o packet header

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0xbfc04000
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0xc0a31f3a
stack pointer           = 0x28:0xe3fbbbd4
frame pointer           = 0x28:0xe3fbbc14
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         = 34 (irq19: sis0)
trap number             = 12
panic: page fault
cpuid = 0
Uptime: 2h37m48s
Physical memory: 977 MB
Dumping 164 MB: 149 133 117 101 85 69 53 37 21 5

#0  doadump () at pcpu.h:195
195             __asm __volatile("movl %%fs:0,%0" : "=r" (td));

The network card is being detected as an SiS 900:
Jun  6 10:03:36 odin2008 kernel: sis0: <SiS 900 10/100BaseTX> port
0x2000-0x20ff mem 0x4a100000-0x4a100fff irq 19 at device 4.0 on pci0
Jun  6 10:03:36 odin2008 kernel: miibus0: <MII bus> on sis0
Jun  6 10:03:36 odin2008 kernel: sis0: Ethernet address: 00:1c:c0:2e:ee:ad
Jun  6 10:03:36 odin2008 kernel: sis0: [ITHREAD]

Has anyone had any good experiences with this chipset?  I can find a few
people with similar problems dating back to 2002, but none recently.  It's
on the supported hardware list.  Any ideas as to a fix or workaround?


(kgdb) bt
#0  doadump () at pcpu.h:195
#1  0xc0757727 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
#2  0xc07579e9 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3  0xc0a4c32c in trap_fatal (frame=0xe3fbbb94, eva=3217047552)
    at /usr/src/sys/i386/i386/trap.c:899
#4  0xc0a4c5b0 in trap_pfault (frame=0xe3fbbb94, usermode=0, eva=3217047552)
    at /usr/src/sys/i386/i386/trap.c:812
#5  0xc0a4cf5c in trap (frame=0xe3fbbb94) at
#6  0xc0a32edb in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7  0xc0a31f3a in bus_dmamap_load (dmat=0xc3fda280, map=0xc0bfe140,
    buf=0x1000000, buflen=2048, callback=0xc0909410 <sis_dma_map_desc_ptr>,
    callback_arg=0xc3f6c378, flags=0) at pmap.h:218
#8  0xc09098ff in sis_newbuf (sc=0xc3fdd300, c=0xc3f6c378, m=0xc4270000)
    at /usr/src/sys/pci/if_sis.c:1384
#9  0xc090b69d in sis_rxeof (sc=0xc3fdd300) at
#10 0xc090b993 in sis_intr (arg=0xc3fdd300) at
#11 0xc073a94b in ithread_loop (arg=0xc3fcd790)
    at /usr/src/sys/kern/kern_intr.c:1036
#12 0xc0737749 in fork_exit (callout=0xc073a7a0 <ithread_loop>,
    arg=0xc3fcd790, frame=0xe3fbbd38) at /usr/src/sys/kern/kern_fork.c:781
#13 0xc0a32f50 in fork_trampoline () at

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