sd was NULL, next = sd->next  segfaulted.

happened on multiple systems. configure line as follows....
(backtrace below)

tried different configure options, different compile optins.
sessions seem to trigger the segfault. random time intervals.


./configure \
        --prefix=%{_prefix} \
        --with-config-file-path=%{_sysconfdir} \
        --disable-debug \
        --enable-shared \
        --enable-pic \
        --with-db3 \
        --with-exec-dir=%{_bindir} \
        --with-gd \
        --with-gdbm \
        --with-imap-ssl \
        --with-jpeg-dir=%{_prefix} \
        --with-ldap \
        --with-pic \
        --with-pgsql=/usr \
        --with-png \
        --with-regex=system \
        --with-xml \
        --with-zlib \
        --enable-debugger \
        --enable-magic-quotes \
        --enable-inline-optimization \
        --enable-safe-mode \
        --enable-shmop \
        --enable-sysvsem \
        --enable-sysvshm \
        --enable-sockets \
        --enable-track-vars \
        --enable-yp \
        --enable-ftp \
        --enable-wddx \
        --without-mysql \
        --without-oracle \
        --without-oci8 \
        --with-mm \
        --with-pic \
        --with-apxs=%{_sbindir}/apxs

make

# Build individual PHP modules.
build_ext() {
%{__cc} -fPIC -shared $RPM_OPT_FLAGS \
        -DCOMPILE_DL_`echo $1 | tr '[a-z]' '[A-Z]'` \
        -DHAVE_`echo $1 | tr '[a-z]' '[A-Z]'` \
        -I. -I./TSRM -I./main -I`%{_sbindir}/apxs -q INCLUDEDIR` -I./Zend \
        -I/usr/include/freetype -I/usr/include/$1 \
        -I./ext/$1 -I./ext/$1/lib$1 \
        -I./ext/xml/expat/xmltok -I./ext/xml/expat/xmlparse \
        `grep ^CPPFLAGS Zend/Makefile | cut -f2- -d=` \
        $4 $2 -o $1.so -L.libs $3 -lc
}
build_ext imap ext/imap/php_imap.c "%{_libdir}/c-client.a $ssllibs -lpam -ldl"
build_ext ldap ext/ldap/ldap.c "-lldap -llber"
build_ext pgsql ext/pgsql/pgsql.c "-lpq" -DHAVE_PQCMDTUPLES


and here the backtrace.....


#0  ps_mm_destroy (data=0x81e04b8) at mod_mm.c:241
#1  0x405131f8 in zm_shutdown_ps_mm (type=1, module_number=19) at mod_mm.c:293
#2  0x404bcf30 in module_destructor (module=0x81e11c0) at zend_API.c:1127
#3  0x404bf648 in zend_hash_destroy (ht=0x405e3020) at zend_hash.c:541
#4  0x404b9079 in zend_shutdown () at zend.c:490
#5  0x404cb384 in php_module_shutdown () at main.c:1050
#6  0x404cb339 in php_module_shutdown_wrapper (sapi_globals=0x405c36a0) at main.c:1027
#7  0x404c808a in apache_php_module_shutdown_wrapper () at mod_php4.c:795
#8  0x08050a39 in run_cleanups ()
#9  0x0804f990 in ap_clear_pool ()
#10 0x0804fa06 in ap_destroy_pool ()
#11 0x0804f9e0 in ap_clear_pool ()
#12 0x0804fa06 in ap_destroy_pool ()
#13 0x0805aa01 in clean_parent_exit ()
#14 0x0805d13b in standalone_main ()
#15 0x0805d400 in main ()
#16 0x40144f6a in __libc_start_main (main=0x805d140 <main>, argc=42, ubp_av=0xbffff854, init=0x804ea38 <_init>,
    fini=0x40012c8c <_dl_debug_mask>, rtld_fini=0x1, stack_end=0x1ff) at ../sysdeps/generic/libc-start.c:129