strange panic: freebsd 6.3: ffs_alloccg: map corrupted [SOLVED]

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> during copying ~350GB from one volume to another on
> the local machine (separate disks, separate fs's) i
> get the following panic:

> start = 0, len = 23691, fs = /newdata
> panic: ffs_alloccg: map corrupted
> KDB: enter: panic
> [ thread pid 835 tid 10070 ]
> stopped at kdb_enter +0x2c:  leave

for those, who are interested in:

this issue was not related to UFS but to GELI.
we were trying to use a 8KB sector size on the geli
provider, which caused the panic.
using 4KB as sector size works.

the command before:
geli init -bP -e 3DES -K /my/test.key -s 8192 /dev/da0

and after:
geli init -bP -e 3DES -K /my/test.key -s 4096 /dev/da0

cheers...