osprey dumped core on 8.2

Osprey is a NetBSD running on m68k

http://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=osprey&dt=2007-02-22%2023:00:18

It dumped core running VACUUM:

--- 1,5 ----
VACUUM;
! server closed the connection unexpectedly
! This probably means the server terminated abnormally
! before or while processing the request.
! connection to server was lost

The stack trace report looks incomplete:

================== stack trace: pgsql.27009/src/test/regress/tmp_check/data/postgres.core ==================
Core was generated by `postgres'.
Program terminated with signal 11, Segmentation fault.
#0 0x001f74d6 in AllocSetAlloc (context=0x307d10, size=16777212) at aset.c:546
546 if (set->blocks != NULL)

It's missing the "bt" part.

I don't understand how can this happen, given that "set" cannot be NULL
at this point.

--
Alvaro Herrera http://www.amazon.com/gp/registry/CTMLCN8V17R4
"Puedes elegir el color de tu auto -- siempre y cuando sea negro."
(Henry Ford)