From owner-freebsd-stable@FreeBSD.ORG Thu May 15 00:01:30 2003 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3B6D537B401 for ; Thu, 15 May 2003 00:01:30 -0700 (PDT) Received: from cirb503493.alcatel.com.au (c18609.belrs1.nsw.optusnet.com.au [210.49.80.204]) by mx1.FreeBSD.org (Postfix) with ESMTP id B8F9D43F3F for ; Thu, 15 May 2003 00:01:28 -0700 (PDT) (envelope-from peterjeremy@optushome.com.au) Received: from cirb503493.alcatel.com.au (localhost.alcatel.com.au [127.0.0.1])h4EK3Xp9019663; Thu, 15 May 2003 06:03:34 +1000 (EST) (envelope-from jeremyp@cirb503493.alcatel.com.au) Received: (from jeremyp@localhost) by cirb503493.alcatel.com.au (8.12.8/8.12.8/Submit) id h4EK3VIh019662; Thu, 15 May 2003 06:03:31 +1000 (EST) Date: Thu, 15 May 2003 06:03:31 +1000 From: Peter Jeremy To: Jonas Bulow Message-ID: <20030514200331.GD4366@cirb503493.alcatel.com.au> References: <3EC10790.50809@bulow.mine.nu> <20030514100716.GA4410@cirb503493.alcatel.com.au> <3EC22DB4.70409@bulow.mine.nu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3EC22DB4.70409@bulow.mine.nu> User-Agent: Mutt/1.4.1i cc: freebsd-stable Subject: Re: Kernel panic on FreeBSD 4.8-STABLE X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 May 2003 07:01:30 -0000 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 : mov $0xc0298550,%edi >0xc023ced4 : mov 0xc0298558,%ebx >0xc023ceda : mov 0x0(%edi),%eax >0xc023cedd : mov %eax,0x0(%ebx) >0xc023cee0 : mov 0x4(%edi),%eax >0xc023cee3 : mov %eax,0x4(%ebx) >0xc023cee6 : mov $0x20,%esi >0xc023ceeb : 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