deadc0de panic in fxp driver

[Kris Kennaway]

Peter Holm's stress test gave me this on an SMP machine running fresh
7.0:

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0xdeadc0de
fault code              = supervisor write, page not present
instruction pointer     = 0x20:0xc0681633
stack pointer           = 0x28:0xf3bbeb88
frame pointer           = 0x28:0xf3bbeb88
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         = 24 (irq17: fxp0)
[thread pid 24 tid 100020 ]
Stopped at      trash_dtor+0x10:        movl    $0xdeadc0de,0(%edx)
db> wh
Tracing pid 24 tid 100020 td 0xcc47b1a0
trash_dtor(deadc0de,800,0,f3bbebb8,c05295bb) at trash_dtor+0x10
trash_init(deadc0de,800,1,7f,35) at trash_init+0x20
mb_zinit_pack(ccb7e100,100,1,85f,f3bbebec) at mb_zinit_pack+0x50
uma_zalloc_bucket(c1057000,1,c073d432,75d,0) at uma_zalloc_bucket+0x1f1
uma_zalloc_arg(c1057000,f3bbec4c,1,1,c072a086) at uma_zalloc_arg+0x38e
fxp_add_rfabuf(cc546000,cc54604c,2,61a,cc546014) at fxp_add_rfabuf+0x35
fxp_intr_body(cc546000,cc53c000,40,ffffffff,cc53c000) at fxp_intr_body+0x115
fxp_intr(cc546000,f3bbecdc,c052aa10,c07f5c90,1) at fxp_intr+0xcf
ithread_execute_handlers(cc4cccd8,cc477700,c0725a19,2f9,cc47b1a0) at ithread_execute_handlers+0x10e
ithread_loop(cc539960,f3bbed38,c0725807,31a,cc539960) at ithread_loop+0x78
fork_exit(c051cdfa,cc539960,f3bbed38) at fork_exit+0xc5
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xf3bbed6c, ebp = 0 ---
db>

I can leave it in DDB for a little while (can't dump) in case someone
needs additional debugging, but not forever.

Kris
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