Re: stacked unionfs freeze and crash FreeBSD

On Wednesday 20 January 2010 17:28:21 Gary Jennejohn wrote:
> On Wed, 20 Jan 2010 15:43:12 +0200 David Naylor wrote:
> > Hi,
> >
> > The attached script, that uses stacked unionfs, causes FreeBSD-9 (cvsup
> > yesterday) to freeze and FreeBSD-8 (cvsup two days ago) to crash:
> >
> > Fatal double fault
> > rip-0xffffffff81e4c1
> > rsp=0xffffff80b133ef50
> > rbp=0xffffff80b133f150
> > cupid = 2; apic id = 02
> > panic: double fault
> > cpuid = 2
> > uptime: 1h44m35s
> > cannot dump.  Device not defined or unavailable
> >
> >
> > Both systems use the stock GENERIC kernel, i.e. -9 had full diagnostics
> > built in (and was run under VirtualBox) and -8 had no diagnostics (and
> > was run native).
> >
> > A LOR is produces prior to freezing under -9 (quiet a time prior).  See
> > kern/141950.
> >
> > The script uses unionfs to build ports (in an attempt to create a
> > tinderbox without the need to delete and/or extract packages).  To use
> > the script to:
> >
> > # mkdir /tmp/localbase /tmp/builddir
> > # env LOCALBASE=/tmp/localbase BUILDDIR=/tmp/builddir
> > ./ports-union-builder.sh
> 
> Is your /tmp big enough?

I was actually using /home, didn't think people wanted to contaminate that 
directory.  Plenty of space.  

> > This will try build everything for x11/xorg.
> >
> > Is it possible that VirtualBox is interfering in getting usable
> > diagnostics for -9
> 
> Who knows?  You might try posting your shell script so others can give
> it a whirl on a "real" 9-current system.

I did attach the script.  Guess mailer ate it, again.  I'll try again...  

> > and how can I setup a dump device for -8.  Currently I have:
> >
> > # swapinfo
> > Device          1K-blocks     Used    Avail Capacity
> > /dev/ad4s1b       8388608        0  8388608     0%
> > /dev/ad8s1b       8388608        0  8388608     0%
> > Total            16777216        0 16777216     0%
> 
> Do you have dumpdev defined in /etc/rc.conf and/or do you see
> /dev/dumpdev?  Having /dev/dumpdev indicates that dumpon succeeded.

No I haven't and no I don't.  I thought it automatically used swap?  

I'll 'activate' it and post the results.  

> Do you have less than 8GB of memory?  See dumpon(8) for restrictions.

I have 6GB.