freebsd stable - Dec 2012 - 9.1-RC3 reproducible kernel panic in ffs_valloc?

Hello :-)

After days of problem with my system storage (?) I think I have located the
issue, or at least I am able to reproduce it, please take a look at
attached picture (photo of a crash).

http://i45.tinypic.com/23qtcx.jpg

At first I thought that was the Ext2 filesystem issue, but then I have
replaced the filesystem to UFS2-SU+J (which increased transfer efficiency
and dramatically reduced filesystem check time compared to Ext2) but the
issue persisted. This problem occurs also when only / is mounted (no
additional storage locations only the OS).

Right now I am not sure if this is storage related anymore... but there are
some remarks about ffs. Crash occurs after I start Xorg (Kde3 WM, all
packages installed from binary packages with portinstall). Please let me
know if you need additional information/tests :-)

Best regards :-)
Tomek

--
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info

This problem was caused by corrupted UFS2-SU+J (9.x default) filesystem
marked as clean where journal showed no issues, running fsck -t ufs -fy
solved the issue!

http://i47.tinypic.com/35m1qxk.jpg

I guess filesystem related kernel panic should enforce full filesystem
chceck (some filesystem flag or journal date modification to enforce full
check).

Maybe it is possible to stop the OS in that case, perform some sort of fsck
running from memory, and then continue the OS with no crash? :-)

Best regards :-)
Tomek

--
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info