freebsd stable - Nov 2007 - System unbootable after upgrade to FBSD 7

Hi,

I just upgraded my first system from 6-stable to 7. installkernel and
installworld went well. However, the system won't boot anymore. :-(
The bootloader still appears, grabs kernel and modules, followed by

Can't work out which disk we are booting from.
Guessed BIOS device 0xffffffff not found by probes, defaulting to disk0:

panic: free: guard1 fail @ 0x6c23c
from /usr/src/sys/boot/i386/loader/../../common/module.c:959

press any key to reboot



Maybe I did something stupid during the update, though I cannot imagine
what it might have been. Any hints how to get my system back online?


cu
  Gerrit

On Tue, 13 Nov 2007 09:38:00 +0100 Gerrit K?hn
<gerrit@pmp.uni-hannover.de> wrote about System unbootable after upgrade
to FBSD 7:

GK> Can't work out which disk we are booting from.
GK> Guessed BIOS device 0xffffffff not found by probes, defaulting to
GK> disk0:
GK> panic: free: guard1 fail @ 0x6c23c
GK> from /usr/src/sys/boot/i386/loader/../../common/module.c:959

For the record: I just managed to find the solution for this on -current
(don't know why I couldn't find this already yesterday): Bad CFLAGS in
make.conf.


cu
  Gerrit