Date: Wed, 13 Jun 2001 08:48:18 +0200 From: Wilko Bulte <wkb@freebie.xs4all.nl> To: Matthew Jacob <mjacob@feral.com> Cc: Andrew Gallatin <gallatin@cs.duke.edu>, wilko@FreeBSD.ORG, freebsd-alpha@FreeBSD.ORG, jhb@FreeBSD.ORG Subject: Re: followup on 8 way SMP pani Message-ID: <20010613084818.A10232@freebie.xs4all.nl> In-Reply-To: <Pine.BSF.4.21.0106122331460.39150-100000@beppo.feral.com>; from mjacob@feral.com on Tue, Jun 12, 2001 at 11:33:38PM -0700 References: <Pine.BSF.4.21.0106121858250.39150-100000@beppo.feral.com> <Pine.BSF.4.21.0106122331460.39150-100000@beppo.feral.com>
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On Tue, Jun 12, 2001 at 11:33:38PM -0700, Matthew Jacob wrote:
Not to worry. The 8 way box is going to be powered down tomorrow for
moving it to another building. I don't expect it to be back /me having the
time until end of next week (earliest).
Wilko
> No, I likely *won't* be able to fix this today, as kernels built with the
> latest panic with:
>
> recursed on non-recursive lock (sleep mutex) mbuf free list lock @
> ../../kern/uipc_mbuf.c:582
> first acquired @ ../../kern/uipc_socket.c:875
> panic: recurse
> cpuid = 0; panic
> Stopped at Debugger+0x34: zapnot v0,#0xf,a0 <v0=0x0,a0=0x6>
> db> t
> Debugger() at Debugger+0x34
> panic() at panic+0x178
> witness_lock() at witness_lock+0x488
> m_freem() at m_freem+0x4e8
> soreceive() at soreceive+0x19dc
> recvit() at recvit+0x1a4
> recvfrom() at recvfrom+0x9c
> syscall() at syscall+0x708
> XentSys() at XentSys+0x64
> --- syscall (29, FreeBSD ELF, recvfrom) ---
> --- user mode ---
>
>
> What I needed to fix for turbolaser is to clear the timer interrupt for all
> CPUs but the primary CPU- this is the TLINTRMASK{0,1} registers. But, stupid
> me, I upgraded my source first.
>
> -matt
>
>
> On Tue, 12 Jun 2001, Matthew Jacob wrote:
>
> >
> > Oh! I was really snoozing- many other things happening (mostly personal)!
> >
> > This should be easy to fix- let me look at this tomorrow.
> >
> > On Tue, 12 Jun 2001, Andrew Gallatin wrote:
> >
> > >
> > > Wilko Bulte writes:
> > > > On Mon, Jun 11, 2001 at 10:06:56AM +0000, Wilko Bulte wrote:
> > > >
> > > > Does this make any sense to anybody? Drew, you asked for a traceback?
> > >
> > > <...>
> > >
> > > > > trap entry = 0x2 (memory management fault)
> > > > > cpuid = 0
> > > > > faulting va = 0x78
> > > > > type = access violation
> > > > > cause = load instructon
> > > > > pc = 0xfffffc0000491ae4
> > > > > ra = 0xfffffc0000491ba8
> > > > > sp = 0xfffffc00008d9b90
> > > > > usp = 0x0
> > > > > curproc = 0xfffffc0000831288
> > > > > pid = 0, comm = swapper
> > > > >
> > > > > Stopped at sync_other_counter+0x24: ldq s1,0x78(s0) <0x78>
> > > > > <s1=0xfffffc0000785138,s0=0x0>
> > > > > db> trace
> > > > > sync_other_counter() at sync_other_counter+0x24
> > > > > tc_windup() at tc_windup+0x28
> > > > > hardclock() at hardclock+0x1e8
> > > > > handleclock() at handleclock+0x22c
> > > > > alpha_clock_interrupt() at alpha_clock_interrupt+0x68
> > > > > interrupt() at interrupt+0xb8
> > > > > XentIntlgp() at XentIntlgp+0x14
> > > > > db> halt
> > > > >
> > >
> > > Yes, sorry I never replied. According to Matt, the turbolaser doesn't
> > > have an i8254 timecounter. And the alpha timecounter is never
> > > initialized in alpha/alpha/clock.c if ncpus>1, so you're taking a
> > > clock interrupt with no timecounter. Oops. No MP for TurboLasers
> > > right now, I guess.
> > >
> > > Here's the code in question:
> > >
> > > /*
> > > * XXX: TurboLaser doesn't have an i8254 counter.
> > > * XXX: A replacement is needed, and another method
> > > * XXX: of determining this would be nice.
> > > */
> > > if (hwrpb->rpb_type != ST_DEC_21000) {
> > > tc_init(&i8254_timecounter);
> > > }
> > >
> > > if (ncpus == 1) {
> > > alpha_timecounter.tc_frequency = freq;
> > > tc_init(&alpha_timecounter);
> > > }
> > >
> > > I think there are bigger fish to fry right now, but this needs to be
> > > fixed. I'm not at all sure what to do, since I don't think that
> > > the cycle counters on multiple cpus are in sync..
> > >
> > > Drew
> > >
> > > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > > with "unsubscribe freebsd-alpha" in the body of the message
> > >
> >
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-alpha" in the body of the message
> >
---end of quoted text---
--
| / o / / _ Arnhem, The Netherlands email: wilko@freebsd.org
|/|/ / / /( (_) Bulte http://www.freebsd.org
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