Date: Thu, 15 May 2003 06:03:31 +1000 From: Peter Jeremy <peterjeremy@optushome.com.au> To: Jonas Bulow <jonas@bulow.mine.nu> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: Kernel panic on FreeBSD 4.8-STABLE Message-ID: <20030514200331.GD4366@cirb503493.alcatel.com.au> In-Reply-To: <3EC22DB4.70409@bulow.mine.nu> References: <3EC10790.50809@bulow.mine.nu> <20030514100716.GA4410@cirb503493.alcatel.com.au> <3EC22DB4.70409@bulow.mine.nu>
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On Wed, May 14, 2003 at 01:51:16PM +0200, Jonas Bulow wrote:
>Peter Jeremy wrote:
>>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.
>
>This is beyond my skills. :-) Does the disassemble say anything usefull?
>
>(kgdb) disassemble 0xc023ceeb
...
>0xc023cecf <sw1a+93>: mov $0xc0298550,%edi
>0xc023ced4 <sw1a+98>: mov 0xc0298558,%ebx
>0xc023ceda <sw1a+104>: mov 0x0(%edi),%eax
>0xc023cedd <sw1a+107>: mov %eax,0x0(%ebx)
>0xc023cee0 <sw1a+110>: mov 0x4(%edi),%eax
>0xc023cee3 <sw1a+113>: mov %eax,0x4(%ebx)
>0xc023cee6 <sw1a+116>: mov $0x20,%esi
>0xc023ceeb <sw1a+121>: ltr %si
It's dying trying to switch tasks. %edi isn't _common_tssd so it's a
private TSS. This is a bit beyond my skills to debug remotely - I
don't suppose you have a iA32 system programming manual handy? You
could try printing the 8 bytes following %edi in frame #18
(0xc612f830) and the TSS they point to (if you can - I can't
quickly/easily describe how to convert the TSS descriptor to the TSS
address).
Whilst you're at it, can you print all the registers at frame #18.
Peter
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