Problem summary: Apache instantly crashes.

Note: No problem with PHP 3.0.13 (everything else being equal).

Base system: Red Hat 6.1.
Kernel upgraded to Red Hat Rawhide's 2.2.14-1.1.0

glibc, gd, egcs as Red Hat 6.1 default

Hardware:
i686SMP (two equally clocked CPUs)

MySQL versions tried:
3.22.30
3.22.32
(both gave segfault)

Apache-version:
apache-mod_ssl (Apache 1.3.12, modssl 2.6.0.)
openssl version 0.9.5
Ordinary (non-modssl) Apache not tried.

Starting Apache with either ("httpd" or "httpd -DSSL" makes no difference).

PHP configure options:
        --with-apxs \
        --prefix=/usr \
        --with-config-file-path=/etc/httpd/conf \
        --with-mysql \
        --with-system-regex \
        --with-memory-limit \
        --with-gd \
        --enable-url-includes \
        --with-xml

Removing "--with-mysql" cures the problem.

Compiler optimization flags tried (trouble with both sets of options):

-O3 -march=pentiumpro -mcpu=pentiumpro -malign-loops=2 -malign-jumps=2 -malign-functions=2

-O2 -m486


Backtrace:
[root@developer SPECS]# httpd -X
Segmentation fault (core dumped)
[root@developer SPECS]# gdb /usr/sbin/httpd core 
GNU gdb 4.18
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This GDB was configured as "i386-redhat-linux"...(no debugging symbols found)...
Core was generated by `httpd -X'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/libm.so.6...done.
Reading symbols from /lib/libcrypt.so.1...done.
Reading symbols from /lib/libdb.so.3...done.
Reading symbols from /lib/libdl.so.2...done.
Reading symbols from /lib/libc.so.6...done.
Reading symbols from /lib/ld-linux.so.2...done.
Reading symbols from /lib/libnss_files.so.2...done.
Reading symbols from /usr/lib/apache/mod_mmap_static.so...done.
Reading symbols from /usr/lib/apache/mod_vhost_alias.so...done.
Reading symbols from /usr/lib/apache/mod_env.so...done.
Reading symbols from /usr/lib/apache/mod_define.so...done.
Reading symbols from /usr/lib/apache/mod_log_config.so...done.
Reading symbols from /usr/lib/apache/mod_mime_magic.so...done.
Reading symbols from /usr/lib/apache/mod_mime.so...done.
Reading symbols from /usr/lib/apache/mod_negotiation.so...done.
Reading symbols from /usr/lib/apache/mod_status.so...done.
Reading symbols from /usr/lib/apache/mod_info.so...done.
Reading symbols from /usr/lib/apache/mod_include.so...done.
Reading symbols from /usr/lib/apache/mod_autoindex.so...done.
Reading symbols from /usr/lib/apache/mod_dir.so...done.
Reading symbols from /usr/lib/apache/mod_cgi.so...done.
Reading symbols from /usr/lib/apache/mod_asis.so...done.
Reading symbols from /usr/lib/apache/mod_imap.so...done.
Reading symbols from /usr/lib/apache/mod_actions.so...done.
Reading symbols from /usr/lib/apache/mod_userdir.so...done.
Reading symbols from /usr/lib/apache/mod_alias.so...done.
Reading symbols from /usr/lib/apache/mod_rewrite.so...done.
Reading symbols from /usr/lib/apache/mod_access.so...done.
Reading symbols from /usr/lib/apache/mod_auth.so...done.
Reading symbols from /usr/lib/apache/mod_digest.so...done.
Reading symbols from /usr/lib/apache/mod_cern_meta.so...done.
Reading symbols from /usr/lib/apache/mod_expires.so...done.
Reading symbols from /usr/lib/apache/mod_headers.so...done.
Reading symbols from /usr/lib/apache/mod_setenvif.so...done.
Reading symbols from /usr/lib/apache/libphp3.so...done.
Reading symbols from /usr/lib/libgd.so.1...done.
Reading symbols from /usr/lib/libttf.so.2...done.
Reading symbols from /usr/lib/libmysqlclient.so.6...done.
Reading symbols from /usr/lib/libgdbm.so.2...done.
Reading symbols from /lib/libpam.so.0...done.
Reading symbols from /lib/libresolv.so.2...done.
Reading symbols from /lib/libnsl.so.1...done.
Reading symbols from /usr/lib/libz.so.1...done.
Reading symbols from /lib/libpthread.so.0...done.
#0  0x40457f05 in php3_constants () from /usr/lib/apache/libphp3.so
(gdb) bt
#0  0x40457f05 in php3_constants () from /usr/lib/apache/libphp3.so
#1  0x4046ba96 in _nss_files_getservbyname_r (name=0x4042db96 "mysql", proto=0x4042de30 "tcp", result=0x4019115c, 
    buffer=0x80bb458 "mysql", buflen=1024, errnop=0x4018efe0) at nss_files/files-service.c:43
#2  0x40165fa8 in __getservbyname_r (name=0x4042db96 "mysql", proto=0x4042de30 "tcp", resbuf=0x4019115c, buffer=0x80bb458 "mysql", 
    buflen=1024, result=0xbfffb92c) at ../nss/getXXbyYY_r.c:182
#3  0x40165e24 in getservbyname (name=0x4042db96 "mysql", proto=0x4042de30 "tcp") at ../nss/getXXbyYY.c:123
#4  0x403f2935 in php3_minit_mysql () from /usr/lib/apache/libphp3.so
#5  0x403d34ae in module_startup_modules () from /usr/lib/apache/libphp3.so
#6  0x403cb9ff in php3_module_startup () from /usr/lib/apache/libphp3.so
#7  0x403c9f35 in php3_create_dir () from /usr/lib/apache/libphp3.so
#8  0x8056518 in ap_single_module_configure ()
#9  0x8050259 in ap_get_server_built ()
#10 0x8054eaa in ap_add_named_module ()
#11 0x8055520 in ap_handle_command ()
#12 0x80556f2 in ap_process_resource_config ()
#13 0x8055fc8 in ap_read_config ()
#14 0x805d866 in ap_update_child_status ()
#15 0x805e38b in main ()
#16 0x400b81eb in __libc_start_main (main=0x805df7c <main>, argc=2, argv=0xbffffc74, init=0x804f734 <_init>, fini=0x808231c <_fini>, 
    rtld_fini=0x4000a610 <_dl_fini>, stack_end=0xbffffc6c) at ../sysdeps/generic/libc-start.c:90
(gdb)