panic: APIC: Previous IPI is stuck
jhb at FreeBSD.org
Tue Sep 28 08:43:36 PDT 2004
On Monday 27 September 2004 05:55 pm, Brian Fundakowski Feldman wrote:
> On Mon, Sep 27, 2004 at 04:35:44PM -0400, John Baldwin wrote:
> > On Friday 24 September 2004 08:24 pm, Andy Farkas wrote:
> > > I have been having this problem for a few weeks now. Glad I'm not the
> > > only one. My box is a 4xPPro running 5.3-BETA5. It panics with either
> > > ULE or 4BSD.
> > >
> > > My theory is that a physical IPI gets lost somewhere and the kerenl
> > > spins waiting for it. But thats just a stab in the dark because nobody
> > > cares to explain why IPI's would be stuck.
> > The panic has to do with a previous IPI not finished being sent from the
> > same CPU. I've yet to determine why this happens. You can try editing
> > sys/i386/i386/local_apic.c and turning on 'DETECT_DEADLOCK' (I think it
> > is just commented out) and seeing if that improves stability. I also see
> > this on a 4xPIIXeon system I use for testing.
> Can KTR logging be leveraged to find the root cause(s) of these deadlocks,
> or is it just so wildly unpredictable that it would be of no use?
It might could be, but I think it would probably slow things down so much that
they would go away.
John Baldwin <jhb at FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve" = http://www.FreeBSD.org
More information about the freebsd-current