Filesystem panic in 5.2.1-RELEASE

[DrumFire]

>I'll see if that makes anything more stable, but otherwise I'd be 
>interested in other people's comments about the crashes I've seen.

I've a kernel panic on ffs_copyonwrite on a 5.2.1 FreeBSD Box, If i 
try to access to filesystem, while fsck in background try to mark it
clean.

For a blackout, my /dev/ad0s1d on /usr gone broken. When I rebooted, 
after login, in ps I've seen that was a fsck in background. Then 
i tried to install ports with sysinstall while fsck cleening the 
filesystem, and after 4-5 minutes kernel gone in panic.

I've put background_fsck="NO" in /etc/rc.conf so when filesystem is 
broken, I'll check and clean it before login.

If needed I can reproduce the problem and post here dmesg etc.

Bye.