the following code causes Apache processes to segfault:

        $xsl_handle = xslt_create();
        echo $xsl_handle; // returns a valid xslt processor handle
        // $xslData and $xmlData contain valid information
        xslt_process($xslData, $xmlData, $result);
        echo xslt_error($xsl_handle);
        xslt_free($xsl_handle);

This piece of code also returns a "Warning: Supplied argument is not a valid XSLT Processor resource in *** on line 27", where line 27 is "xslt_process($xslData, $xmlData, $result);
"

Backtrace:

Program received signal SIGSEGV, Segmentation fault.
0x404b251b in strlen (str=0x0) at ../sysdeps/i386/strlen.c:27
27      ../sysdeps/i386/strlen.c: No such file or directory.
(gdb) bt
#0  0x404b251b in strlen (str=0x0) at ../sysdeps/i386/strlen.c:27
#1  0x8114a6d in zif_xslt_error (ht=1, return_value=0x8367dfc, this_ptr=0x0,
    return_value_used=1) at sablot.c:584
#2  0x8155e2a in execute (op_array=0x835694c) at ./zend_execute.c:1590
#3  0x8131419 in zend_execute_scripts (type=8, retval=0x0, file_count=3)
    at zend.c:814
#4  0x8073ae1 in php_execute_script (primary_file=0xbffff358) at main.c:1309
#5  0x813cc6c in apache_php_module_main (r=0x8337ba8, display_source_mode=0)
    at sapi_apache.c:90
#6  0x80700e6 in send_php () at eval.c:88
#7  0x8070142 in send_parsed_php () at eval.c:88
#8  0x81a4819 in ap_invoke_handler () at eval.c:88
#9  0x81b9b6f in process_request_internal () at eval.c:88
#10 0x81b9fd6 in ap_internal_redirect () at eval.c:88
#11 0x8196a2d in mod_gzip_redir1_handler () at eval.c:88
#12 0x81952c2 in mod_gzip_handler () at eval.c:88
#13 0x81a4819 in ap_invoke_handler () at eval.c:88
#14 0x81b9b6f in process_request_internal () at eval.c:88
#15 0x81b9bd6 in ap_process_request () at eval.c:88
#16 0x81b09f6 in child_main () at eval.c:88
#17 0x81b0bd5 in make_child () at eval.c:88
#18 0x81b0d4c in startup_children () at eval.c:88
#19 0x81b13dd in standalone_main () at eval.c:88
#20 0x81b1c5c in main () at eval.c:88
#21 0x4045a2eb in __libc_start_main (main=0x81b18a8 <main>, argc=2,
    ubp_av=0xbffffb34, init=0x806cdec <_init>, fini=0x81d83ac <_fini>,
    rtld_fini=0x4000c130 <_dl_fini>, stack_end=0xbffffb2c)
    at ../sysdeps/generic/libc-start.c:129

Specs:

Slackware-8.0 glibc-2.2.3 (Linux osiris 2.4.14 #1 Thu Nov 8 15:02:47 CET 2001 i686 unknown)
apache_1.3.22
php-4.1.0RC5
expat-1.95.2
Sablot-0.71

PHP config:

./configure \
--with-apache=../apache_1.3.22 \
--with-mysql=/usr/local/mysql \
--with-gd=/usr/local \
--with-freetype-dir=/usr/local \
--with-jpeg-dir=/usr \
--with-png-dir=/usr \
--with-zlib \
--with-openssl \
--with-curl \
--enable-xslt \
--with-xslt-sablot \
--enable-sysvsem \
--enable-sysvshm \
--enable-track-vars \
--enable-memory-limit \
--enable-debug=yes

Apache config:

EAPI_MM=../mm-1.1.3 \
SSL_BASE=/usr \
./configure \
--with-layout=Apache \
--prefix=/usr/local/apache \
--enable-module=rewrite \
--enable-module=ssl \
--add-module=/root/downloads/mod_gzip.c \
--activate-module=src/modules/php4/libphp4.a