hi,

playing more with unionfs on my ss20 I get the above panic shutting
down the system (shutdown -r now) w/o umounting my union mounted
/usr/src. it's no real problem, as it doesn't affect the running
system (just did a "make build" last night which went flowlessly and
building a new kernel using "make -j 7" was successfull, too).

so here's the ddb-trace:

_lockmgr
_ufs_lock
_vn_lock
_vrele
_union_freevp
_union_reclaim
_vclean
_vgonel
_vflush
_union_umount
_dounmount
_vfs_unmountall
_vfs_shutdown
_cpu_reboot
_sys_reboot
_syscall
syscall

what can i do to help debugging this?

-kurt