geom_journal panic: wrong offset 500107860990 for sectorsize 512

After running:

gjournal load
gjournal label -s 4G /dev/mirror/data

I got this panic, and now every time I load geom_journal.ko, the system 
panics this same way.

GEOM_JOURNAL: Journal 4239489025: mirror/data contains data.
GEOM_JOURNAL: Journal 4239489025: mirror/data contains journal.
GEOM_JOURNAL: Journal mirror/data clean.
panic: wrong offset 500107860990 for sectorsize 512

I have a crash dump to look at if needed.
Looks something like this:
#8  0xc06e0f13 in kdb_enter (msg=0x12 <Address 0x12 out of bounds>) at 
cpufunc.h:60
#9  0xc06c2334 in panic (fmt=0xc0943b8b "wrong offset %jd for sectorsize 
%u") at /usr/src/sys/kern/kern_shutdown.c:547
#10 0xc0685316 in g_io_request (bp=0xc2edaad4, cp=0xc2485140) at 
/usr/src/sys/geom/geom_io.c:356
#11 0xc0685aae in g_write_data (cp=0xc2485140, offset=Unhandled dwarf 
expression opcode 0x93) at /usr/src/sys/geom/geom_io.c:643


This is running -CURRENT's latest snapshot (from March).

Eric


-- 
------------------------------------------------------------------------
Eric Anderson        Sr. Systems Administrator        Centaur Technology
An undefined problem has an infinite number of solutions.
------------------------------------------------------------------------