Re: reproducible crash when building sysutils/net-snmp

["Steven M. Bellovin" <smb%cs.columbia.edu@localhost>]

On Fri, 11 Jan 2008 08:02:34 +0000
David Laight <david%l8s.co.uk@localhost> 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