Re: > panic: APIC: Previous IPI is stupcmka

From: John Baldwin <jhb_at_FreeBSD.org>
Date: Tue, 22 Jun 2004 17:22:44 -0400
On Tuesday 22 June 2004 05:43 am, Kris Kennaway wrote:
> On Mon, Jun 21, 2004 at 09:41:42PM -0700, Kris Kennaway wrote:
> > > panic: APIC: Previous IPI is stupcmka
> > > u_clpauziydf i=x :0 ;s p
> > > cnD efbourg g5e0r0(0"0p0a0n0i
> > >  ")
> >
> > I updated this smp machine -current tonight, played with mutex
> > profiling a bit, and it died after an hour or so of package building
> > load.  It hung here.
>
> This happened again under similar circumstances (running a cvs update
> with some network stuff going on).  Similar interleaved panic message:
>
> _anic: APIC: Previous IPI is stpumcakp
> nlcapzuyifdi x=:  0s;p u
> i Dfeobru g5g0e0r0(0"0p0a0n
>  c")

Seems the two CPUs are deadlocked waiting on each other.  The first sent a 
pmap_lazyfixup IPI to the second but the second has interrupts disabled as it 
is trying to send an IPI as well.

-- 
John Baldwin <jhb_at_FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org
Received on Tue Jun 22 2004 - 19:21:49 UTC

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