psql -c tends to core dump if interrupted

In current sources, try the following:

while true; do
psql -c "checkpoint" yourdb
done

(any SQL command will do, it needn't be a checkpoint)

Press control-C while it's cycling. A fair fraction of the time
I get a SEGV coredump from psql.

I've been able to replicate this on both HPUX and LinuxPPC, but I can't
get a useful traceback from either; apparently the stack is trashed.
For example HPUX just gives me

Core was generated by `psql'.
Program terminated with signal 11, Segmentation fault.

#0 0xc0149e14 in ?? () from /usr/lib/libc.1
(gdb) bt
#0 0xc0149e14 in ?? () from /usr/lib/libc.1
Cannot access memory at address 0xffffffac
(gdb)

Anyone else see this? Can anyone else get a more helpful stack trace?

regards, tom lane