panic: ffx_valloc: dup alloc + SU+J + fsck

[Nikos Vassiliadis]

Hello,

I am seeing this kernel panic on a su+j ufs. It seems that
a su+j aware fsck cannot repair the file system, fsck corrects
all fs-problems it finds but the kernel panics on the first
write operation. The file system is corrected when a full fsck
takes place. This fs lives on a virtual machine and I do have a
snapshot of the fs in this problematic state in case someone
wants to investigate further.

The panic:
http://img135.imageshack.us/img135/1111/panicw.png

and a backtrace:
http://img856.imageshack.us/img856/7516/65759196.png

Thanks, Nikos