Date: Thu, 16 Aug 2001 21:52:34 -0700 From: "David O'Brien" <obrien@FreeBSD.org> To: John Baldwin <jhb@FreeBSD.org> Cc: alpha@FreeBSD.org Subject: Re: today's kernel + JHB's trap.c patch is *evil* Message-ID: <20010816215234.A5722@dragon.nuxi.com> In-Reply-To: <XFMail.010816162927.jhb@FreeBSD.org>; from jhb@FreeBSD.org on Thu, Aug 16, 2001 at 04:29:27PM -0700 References: <20010816140739.A1538@dragon.nuxi.com> <XFMail.010816162927.jhb@FreeBSD.org>
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On Thu, Aug 16, 2001 at 04:29:27PM -0700, John Baldwin wrote:
> > Mounting root from ufs:/dev/da0a
> > SMP: AP CPU #1 Launched!
> >
> > fatal kernel trap:
> >
> > trap entry = 0x2 (memory management fault)
> > cpuid = 0
> > faulting va = 0x0
>
> NULL pointer deref.
>
> > type = access violation
> > cause = load instructon
> > pc = 0xfffffc00003c3814
>
> Do you have a debug kernel? If so, can you do 'gdb -k kernel.debug' and then
> do 'l *0xfffffc00003c3814'?
0xfffffc00003c3814 is in _mtx_unlock_sleep
(../../../kern/kern_mutex.c:492).
487
488 p1 = TAILQ_FIRST(&m->mtx_blocked);
489 MPASS(p->p_magic == P_MAGIC);
490 MPASS(p1->p_magic == P_MAGIC);
491
492 TAILQ_REMOVE(&m->mtx_blocked, p1, p_procq);
493
494 if (TAILQ_EMPTY(&m->mtx_blocked)) {
495 LIST_REMOVE(m, mtx_contested);
496 _release_lock_quick(m);
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