On Aug 31, 2005, at 8:28 PM, Kris Kennaway wrote:
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.
Sorry, poorly phrased question. Was in a bit of a hurry.
I have a debug kernel, however I have no dump device (and cannot
create one; I'm geom-mirroring my disks, and for some reason I'm not
able to specify a dump device when that is the case (has been
discussed in the past).
I've been told that a debug kernel might still help, but the
developers handbook does not say anything about what can be done
without a dump. I know this has been up on one of the lists (current,
stable or amd64) I'm on, so I guess I'll go ahead searching for it.
Sorry about the noise. Was just hoping someone recognized the symptoms.
/Eirik
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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