Subject: Re: reproducible crash when building sysutils/net-snmp
To: David Laight <david@l8s.co.uk>
From: Steven M. Bellovin <smb@cs.columbia.edu>
List: current-users
Date: 01/11/2008 08:02:32
On Fri, 11 Jan 2008 08:02:34 +0000
David Laight <david@l8s.co.uk> wrote:
> On Fri, Jan 11, 2008 at 02:53:00AM +0000, Steven M. Bellovin wrote:
> > I'm trying to rebuild sysutils/net-snmp on a T61 running
> > amd64-current. The disk is FFS; I'm not using softdep. Every time
> > I try the build, the system hangs or panics. This last time, I
> > turned off cpu1; it didn't help. The kernel is from last night.
> > Here's the backtrace from the dump:
> >
> > #0 0xffffffff80503105 in cpu_reboot (howto=256, bootstr=<value
> > optimized out>) at /usr/src/sys/arch/amd64/amd64/machdep.c:666
> > 666 dumpsys();
> > (gdb) bt
> > #0 0xffffffff80503105 in cpu_reboot (howto=256, bootstr=<value
> > optimized out>) at /usr/src/sys/arch/amd64/amd64/machdep.c:666
> > #1 0xffffffff80463178 in panic (
> > fmt=0xffffffff80961f05 <Address 0xffffffff80961f05 out of
> > bounds>) at /usr/src/sys/kern/subr_prf.c:230
> > #2 0xffffffff80504e94 in trap (frame=0xffff80004f3428b0)
> > at /usr/src/sys/arch/amd64/amd64/trap.c:264
> > #3 0xffffffff80100f02 in calltrap ()
> > #4 0x0000000000001000 in ?? ()
> > Previous frame inner to this frame (corrupt stack?)
>
> It is possible that my recent changes to the amd64 trap frame have
> stopped gdb being able to traverse them.
>
Any magic I can do to find out more of what's happening?
--Steve Bellovin, http://www.cs.columbia.edu/~smb