On Fri, 12 May 2006, 18:40-0700, Avleen Vig wrote:
> On Sat, May 13, 2006 at 02:39:19AM +0400, Stanislav Sedov wrote:
> > You should use kgdb rather the gdb. GDB doesn't recognizes kernel
> > dumps format by default.
>
> Ah thank you!
>
> Here's the information I found.
> Any help that anyone can provide will go into a nice little "crash
> debugging for beginners" document which I've started working on :-)
>
>
>
> Ok kgdb tells me:
>
> Fatal trap 12: page fault while in kernel mode
> fault virtual address = 0x58
> fault code = supervisor write, page not present
> instruction pointer = 0x20:0xc06005aa
> stack pointer = 0x28:0xd6c13ad0
> frame pointer = 0x28:0xd6c13b00
> 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 = 25911 (python)
> trap number = 12
> panic: page fault
> Uptime: 14h49m8s
> Dumping 511 MB (2 chunks)
> chunk 0: 1MB (159 pages) ... ok
> chunk 1: 511MB (130800 pages) 495 479 463 447 431 415 399 383 367 351 335
> 319 303 287 271 255 239 223 207 191 175 159 143 127 111 95 79 63 47 31 15
>
> #0 doadump () at pcpu.h:165
> 165 pcpu.h: No such file or directory.
> in pcpu.h
>
> The few lines before trap() was called look like this:
>
> #5 0xc071a38d in trap (frame=
> {tf_fs = 8, tf_es = 40, tf_ds = 40, tf_edi = 0, tf_esi = 0, tf_ebp =
> -691979520, tf_isp = -691979588, tf_ebx = -691979136, tf_edx = -691978864,
> tf_ecx = 0, tf_eax = 8, tf_trapno = 12, tf_err = 2, tf_eip = -1067448918,
> tf_cs = 32, tf_eflags = 66183, tf_esp = -691979136, tf_ss = -691979544})
> at /usr/src/sys/i386/i386/trap.c:434
> #6 0xc070814a in calltrap () at /usr/src/sys/i386/i386/exception.s:139
> #7 0xc06005aa in ip_ctloutput (so=0x8, sopt=0xd6c13c80)
> at /usr/src/sys/netinet/ip_output.c:1210
Yes, it is known issue, see kern/97095. Perhaps kern/96413 is related
too. I'm trying to get inpcb locking logic at the moment. We need
Robert Watson attention :-)
--
Maxim Konovalov
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