kernel panic with pmap_qremove()

[John Baldwin]

On Wednesday 08 February 2006 06:42, Anton Barsukov wrote:
> On Mon, 6 Feb 2006 14:58:33 -0500
>
> John Baldwin <jhb at freebsd.org> wrote:
> > On Saturday 28 January 2006 04:23, Anton Barsukov wrote:
> > > Hi everybody
> > >
> > > I install ports/benchmarks/forkbomb,
> > > when i run '%forkbomb -f', kernel panic.
> > >
> > > instruction pointer = pmap_qremove(sva=4290785280, count=0) at
> > > /usr/src/sys/i386/i386/pmap.c:896
> > >
> > > FreeBSD 6.0-RELEASE(GENERIC)  i386
> > > machine( MB -- P4P800SE,
> > > 	      CPU -- P4 3GHz,
> > > 	      RAM -- 2x512Mb )
> >
> > I wasn't able to reproduce this.  Are you still able to trigger this
> > panic?
> >
> > --
> > John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
> > "Power Users Use the Power to Serve"  =  http://www.FreeBSD.org
>
> Yes, the panic still arises.
> When I start under the user, kernel panics, under su the panic not present.
> Custom kernel not panic.

Hmm, the count=0 is suspect.  The line numbers don't seem to line up though 
for pmap.c.  Can you compile in DDB and KDB and capture a stack trace from 
ddb?

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org