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Date:      Wed, 20 Jan 2010 15:43:12 +0200
From:      David Naylor <naylor.b.david@gmail.com>
To:        freebsd-current@freebsd.org
Subject:   stacked unionfs freeze and crash FreeBSD
Message-ID:  <201001201543.15818.naylor.b.david@gmail.com>

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Hi,

The attached script, that uses stacked unionfs, causes FreeBSD-9 (cvsup=20
yesterday) to freeze and FreeBSD-8 (cvsup two days ago) to crash: =20

=46atal double fault
rip-0xffffffff81e4c1
rsp=3D0xffffff80b133ef50
rbp=3D0xffffff80b133f150
cupid =3D 2; apic id =3D 02
panic: double fault
cpuid =3D 2
uptime: 1h44m35s
cannot dump.  Device not defined or unavailable


Both systems use the stock GENERIC kernel, i.e. -9 had full diagnostics bui=
lt=20
in (and was run under VirtualBox) and -8 had no diagnostics (and was run=20
native). =20

A LOR is produces prior to freezing under -9 (quiet a time prior).  See=20
kern/141950. =20

The script uses unionfs to build ports (in an attempt to create a tinderbox=
=20
without the need to delete and/or extract packages).  To use the script to:

# mkdir /tmp/localbase /tmp/builddir
# env LOCALBASE=3D/tmp/localbase BUILDDIR=3D/tmp/builddir ./ports-union-bui=
lder.sh


This will try build everything for x11/xorg. =20

Is it possible that VirtualBox is interfering in getting usable diagnostics=
=20
for -9 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%


Any advice?

Regards

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