5.4-dropping to debugger

[Kris Kennaway]

On Wed, Aug 31, 2005 at 12:51:00PM +0200, Eirik ?verby wrote:
> Hi, every once in a while (about once a week lately), one of my  
> servers has been known to stop responding. Upon connecting the serial  
> console, I find myself at a debugger prompt. This is the output I've  
> gotten this time.
> 
> I do think I have a debug kernel on that machine, what can I do to  
> get more useful information out?

See the chapter on kernel debugging in the developers' handbook.

Kris

> 
> PS: I have seen various kinds of instability on most of my 5.4- 
> installations, no matter the patchlevel. This box is just one of many.
> 
> Anyone?
> 
> /Eirik
> 
> db>
> db> c
> Fatal trap 12: page fault while in kernel mode
> cpuid = 1; apic id = 01
> fault virtual address   = 0x2007010
> fault code              = supervisor write, page not present
> instruction pointer     = 0x8:0xc0581fe8
> stack pointer           = 0x10:0xe3384c40
> frame pointer           = 0x10:0xe3384c70
> 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         = 29 (irq18: fxp0)
> [thread pid 29 tid 100000 ]
> Stopped at      fxp_add_rfabuf+0x68:    movw    %ax,0xe(%ebx)
> db> trace
> Tracing pid 29 tid 100000 td 0xc22a0000
> fxp_add_rfabuf(c2404000,c2404500,2,a6c54bb2,b51487f8) at  
> fxp_add_rfabuf+0x68
> fxp_intr_body(c2404000,c2404000,40,ffffffff,8) at fxp_intr_body+0xf1
> fxp_intr(c2404000,0,0,0,0) at fxp_intr+0x14e
> ithread_loop(c22f6500,e3384d38,0,0,0) at ithread_loop+0x1b8
> fork_exit(c06a9150,c22f6500,e3384d38) at fork_exit+0x80
> fork_trampoline() at fork_trampoline+0x8
> --- trap 0x1, eip = 0, esp = 0xe3384d6c, ebp = 0 ---
> 
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