backend crashing despite tsearch2 patch

I have applied the recent tsearch2 patch and recompiled the tsearch2
module but I am still experiencing the same backend crashes as I
previously described.

Thanks for any help,

Mat

GDB output:

Core was generated by `postgres: mat test [local] SELECT   '.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/lib/libz.so.1...done.
Loaded symbols for /usr/lib/libz.so.1
Reading symbols from /usr/lib/libreadline.so.4...done.
Loaded symbols for /usr/lib/libreadline.so.4
Reading symbols from /lib/libtermcap.so.2...done.
Loaded symbols for /lib/libtermcap.so.2
Reading symbols from /lib/libcrypt.so.1...done.
Loaded symbols for /lib/libcrypt.so.1
Reading symbols from /lib/libresolv.so.2...done.
Loaded symbols for /lib/libresolv.so.2
Reading symbols from /lib/libnsl.so.1...done.
Loaded symbols for /lib/libnsl.so.1
Reading symbols from /lib/libdl.so.2...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib/tls/libm.so.6.1...done.
Loaded symbols for /lib/tls/libm.so.6.1
Reading symbols from /lib/tls/libc.so.6.1...done.
Loaded symbols for /lib/tls/libc.so.6.1
Reading symbols from /lib/ld-linux-ia64.so.2...done.
Loaded symbols for /lib/ld-linux-ia64.so.2
Reading symbols from /usr/local/pgsql/lib/tsearch2.so...done.
Loaded symbols for /usr/local/pgsql/lib/tsearch2.so
#0  SN_create_env (S_size=0, I_size=2, B_size=1) at api.c:6
6           z->p = create_s();
(gdb) bt
#0  SN_create_env (S_size=0, I_size=2, B_size=1) at api.c:6
#1  0x20000000026be870 in SN_create_env (S_size=40770504, I_size=
40509856,
B_size=1034) at api.c:6