Kernel panic on FreeBSD 4.8-STABLE

[Peter Jeremy]

On Tue, May 13, 2003 at 04:56:16PM +0200, Jonas Bulow wrote:
>I need some help to understand a backtrace.

>Fatal trap 9: general protection fault while in kernel mode
>instruction pointer     = 0x8:0xc023ceeb
>stack pointer           = 0x10:0xcf7d9ea4
>frame pointer           = 0x10:0xcf7d9ec0
>code segment            = base 0x0, limit 0xfffff, type 0x1b
>                        = DPL 0, pres 1, def32 1, gran 1
>processor eflags        = resume, IOPL = 0
>current process         = Idle
>interrupt mask          = net tty bio cam
>trap number             = 9
>panic: general protection fault
...
>#17 0xc023d6fb in trap (frame={tf_fs = 16, tf_es = 134938640, tf_ds = 
>-982253552, tf_edi = -971835344, tf_esi = 32,
>      tf_ebp = -813850944, tf_isp = -813850992, tf_ebx = -1070885216, 
>tf_edx = -812732416, tf_ecx = -831483840,
>      tf_eax = 336283586, tf_trapno = 9, tf_err = 32, tf_eip = 
>-1071395093, tf_cs = 8, tf_eflags = 65670, tf_esp = -1072211888,
>      tf_ss = -831471360}) at /usr/src/sys/i386/i386/trap.c:636
>#18 0xc023ceeb in sw1a ()
>#19 0xc0174ff1 in tsleep (ident=0xce70c100, priority=288, 
>wmesg=0xc02530a5 "wait", timo=0) at /usr/src/sys/kern/kern_synch.c:479

#18 is the underlying problem.  sw1a() is in /sys/i386/i386/swtch.s
and you might like to disassemble the code around 0xc023ceeb to see
exactly where it is dying.  GPF is a catch-all category so it's
difficult to know exactly why you're getting it without knowing the
actual instruction it dies on.

Peter