Error using savecore: Value too large.

I'm trying to save a crash dump using savecore, and I'm seeing this:

Feb 19 05:31:05 chief2 savecore: reboot after panic: page fault
savecore: unable to open bounds file, using 0
savecore: writing core to vmcore.0
savecore: write error on vmcore.0 file: Value too large to be stored in
data type
savecore: WARNING: vmcore may be incomplete
Feb 19 05:32:17 chief2 savecore: write error on vmcore.0 file: Value too
large to be stored in data type
savecore: unsaved dumps found but not saved

The vmcore.0 created is only 16M.  The system has 4gb of RAM,
and the dump device is about 40gb.

Should I be concerned about this error message, and if so,
how can I work around it?

System is -CURRENT as of yesterday.

Kris Gale