Bug in RAIDframe

[Armin Ollig <armin_(_at_)_metzelkueche_(_dot_)_tabu_(_dot_)_uni-bonn_(_dot_)_de>]

Hi there,

obsd version is 2.7.
For demonstration purposes i use the same config as described in
raidctl(8) which is a raid5 with only 3 disks and one spare. 
Configure the raid works fine (raidctl -C, -I, -i is OK).
Here is what the thing looks at after the build:
# raidctl  -s raid0
Components:
           /dev/sd2e: optimal
           /dev/sd5e: optimal
           /dev/sd8e: optimal

When runing raidctl -u to unconfigure the device the kernel (generic with
hardwired sd, scsibusses and ahc plus raid pseudo) crashes.

uvm_fault (0xbla)
kernel: page fault trap, code=0
Stopped at _rf_DispatchKernelIO+0x1e8: ...

I made a crash dump from the debugger, but i cant read the smbols :(
(gdb)              target kcore /var/crash/bsd.0.core
#0  0x1000 in ?? ()

IB plan to use this raid device in a production environment :)

Any suggestions ?

Thanks in advance,
--Armin