Mount related panic with FreeBSD 6?

[Václav Haisman]

Hi,
I got this panic on freshly installed FreeBSD 6. I did this df -h and
noticed that /mnt/oldroot/home is somewhat mangled. The /mnt/oldroot is
root of FreeBSD 4.11 system. I successfully copied some settings and all
user accounts from that /mnt/oldroot/home earlier today. This is what I
did before the panic:

logout::wilx:~> df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/ad0s1a           496M   57M  399M  13% /
devfs                 1.0k  1.0k     0 100% /dev
/dev/ad0s1e           989M   12k  910M   1% /tmp
/dev/ad0s1f           163G   29G  120G  20% /usr
/dev/ad0s1d           4.8G  2.0G  2.4G  45% /var
/dev/ad2s1a           492M  317M  136M  70% /mnt/oldroot
df: `/mnt/oldroot/hom': No such file or directory
/dev/ad2s1f           6.7G  5.3G 1013M  85% /mnt/oldroot/usr
/dev/ad2s1e           2.9G  2.2G  476M  83% /mnt/oldroot/var

logout::root:~> mount /mnt/oldroot/home

Notice that /mnt/oldroot/home is mounted twice here:

logout::root:~> mount
/dev/ad0s1a on / (ufs, local)
devfs on /dev (devfs, local)
/dev/ad0s1e on /tmp (ufs, local, soft-updates)
/dev/ad0s1f on /usr (ufs, local, soft-updates)
/dev/ad0s1d on /var (ufs, local, soft-updates)
/dev/ad2s1a on /mnt/oldroot (ufs, local, read-only)
/dev/ad2s1g on /mnt/oldroot/home (ufs, local, read-only)
/dev/ad2s1f on /mnt/oldroot/usr (ufs, local, read-only)
/dev/ad2s1e on /mnt/oldroot/var (ufs, local, read-only)
/dev/ad2s1g on /mnt/oldroot/home (ufs, local, read-only)

logout::root:~> umount /mnt/oldroot/home

logout::root:~> mount
/dev/ad0s1a on / (ufs, local)
devfs on /dev (devfs, local)
/dev/ad0s1e on /tmp (ufs, local, soft-updates)
/dev/ad0s1f on /usr (ufs, local, soft-updates)
/dev/ad0s1d on /var (ufs, local, soft-updates)
/dev/ad2s1a on /mnt/oldroot (ufs, local, read-only)
/dev/ad2s1g on /mnt/oldroot/home (ufs, local, read-only)
/dev/ad2s1f on /mnt/oldroot/usr (ufs, local, read-only)
/dev/ad2s1e on /mnt/oldroot/var (ufs, local, read-only)

logout::root:~> cd /mnt/oldroot/home

logout::root:/mnt/oldroot/home> ls

After the ls it panicked. The only thing I see in logs is this:

Nov 20 12:42:02 logout savecore: reboot after panic: page fault
Nov 20 12:42:02 logout savecore: writing core to vmcore.0

Unfortunatelly trying gdb on the core didn't help.  The kernel is still
the generic one from the release CD:

warning: "/var/crash/vmcore.0": no core file handler recognizes format,
using default
Can't fetch registers from this type of core file
Can't fetch registers from this type of core file
#0  0x00000000 in ?? ()

I realise that this might have been already fixed after the release. I
will try to cvsup the sources and build a new kernel.

Vaclav Haisman
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