threaded process failing with "memcluster.c:436: INSIST(stats..." error

I'm trying to run a sendmail/milter threaded applicaton on openssi
1.2.1/debian.

The process fails with this error:

memcluster.c:436: INSIST(stats[size].gets != 0U) failed.

The process' libs:
        libbind.so.3 => /usr/local/lib/libbind.so.3 (0x00b0e000)
        libmilter.so.0 => /usr/lib/libmilter.so.0 (0x00793000)
        libpthread.so.0 => /lib/libpthread.so.0 (0x00111000)
        libpq.so.4 => /usr/local/pgsql/lib/libpq.so.4 (0x0017d000)
        libc.so.6 => /lib/libc.so.6 (0x00218000)
        libdl.so.2 => /lib/libdl.so.2 (0x005e0000)
        libnsl.so.1 => /lib/libnsl.so.1 (0x00882000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x00201000)
        libcrypt.so.1 => /lib/libcrypt.so.1 (0x005a9000)
        libresolv.so.2 => /lib/libresolv.so.2 (0x0050e000)

Any ideas what this could be?  The app works on other standard distros.


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