fatal trap 12

[Volker]

Hi Robert!

Yes.... I got it right.

I've setup a serial connection, rebuild the kernel (forgot to include 
debugging information, but kernel builds are slow on the AMD K6-2 500), 
installed, rebooted and was waiting for the first trap to come.

Here we are:

> Fatal trap 12: page fault while in kernel mode
> fault virtual address   = 0xffff5d00
> fault code              = supervisor write, page not present
> instruction pointer     = 0x8:0xc054e86d
> stack pointer           = 0x10:0xca3f4c20
> frame pointer           = 0x10:0xca3f4c20
> 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 (swi6: task queue)
> [thread 100035]
> Stopped at      mb_ctor_pack+0x4d:      movl    $0x1,0(%eax)

ddg trace gives:
> db> trace
> mb_ctor_pack(c1558400,100,ca3f4c60,1) at mb_ctor_pack+0x4d
> uma_zalloc_arg(c1044ba0,ca3f4c60,1) at uma_zalloc_arg+0xf0
> ath_rxbuf_init(c1494000,c14a1f18) at ath_rxbuf_init+0x41
> ath_rx_proc(c1494000,1) at ath_rx_proc+0x3c4
> taskqueue_run(c1418ac0,ca3f4d20,c0545009,0,0) at taskqueue_run+0xb7
> taskqueue_swi_run(0) at taskqueue_swi_run+0xe
> ithread_loop(c13b1b80,ca3f4d48) at ithread_loop+0x159
> fork_exit(c0544eb0,c13b1b80,ca3f4d48) at fork_exit+0x79
> fork_trampoline() at fork_trampoline+0x8
> --- trap 0x1, eip = 0, esp = 0xca3f4d7c, ebp = 0 ---

For the case it might be some important piece of information, I've also 
copied the following ddb output (I'm not really highly experienced in 
kernel debugging, so I don't know which info is most important):

> db> show registers
> cs                 0x8
> ds                0x10
> es                0x10
> fs                0x18
> ss                0x10
> eax         0xffff5d00
> ecx         0xc1558400
> edx                0x2
> ebx         0xc1044bd8
> esp         0xca3f4c20
> ebp         0xca3f4c20
> esi         0xc1044ba0
> edi                  0
> eip         0xc054e86d  mb_ctor_pack+0x4d
> efl            0x10206
> dr0                  0
> dr1                  0
> dr2                  0
> dr3                  0
> dr4         0xffff0ff0
> dr5              0x400
> dr6         0xffff0ff0
> dr7              0x400
> mb_ctor_pack+0x4d:      movl    $0x1,0(%eax)
> db>
> db> show pcpu
> cpuid        = 0
> curthread    = 0xc13e37d0: pid 34 "swi6: task queue"
> curpcb       = 0xca3f4da0
> fpcurthread  = none
> idlethread   = 0xc13bd320: pid 10 "idle"
> APIC ID      = 0
> currentldt   = 0x28


I'll start to rebuild the kernel with debugging information (takes about 
an hour) and restart again. I'll post more traces if I catch some. Do 
you need anything else?

Thanks,

Volker


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