When output_handler is set to ob_gzhandler apache receivs SEGV.
My configuration is as follows
PHP 4.0.4 statically linked with apache 1.3.14

PHP was configured with
'./configure' '--with-apache=../apache_1.3.14' '--without-mysql' '--enable-track-vars'
                            '--with-zlib' '--enable-gd-imgstrttf' '--with-gd' '--with-pgsql'
                            '--with-swf=/usr/local/swf'

zlib version 1.1.3

and backtrace is

Starting program: /usr/local/apache/bin/httpd -X
(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...
Program received signal SIGSEGV, Segmentation fault.
0x80e1c04 in call_user_function_ex ()
(gdb) bt
#0  0x80e1c04 in call_user_function_ex ()
#1  0x80c81ca in php_end_ob_buffer ()
#2  0x80c8386 in php_end_ob_buffers ()
#3  0x80f2f6b in apache_php_module_main ()
#4  0x807da6b in send_php ()
#5  0x807da98 in send_parsed_php ()
#6  0x8116903 in ap_invoke_handler ()
#7  0x812a139 in ap_some_auth_required ()
#8  0x812a19c in ap_process_request ()
#9  0x8121a1e in ap_child_terminate ()
#10 0x8121bac in ap_child_terminate ()
#11 0x8121d09 in ap_child_terminate ()
#12 0x8122336 in ap_child_terminate ()
#13 0x8122ac3 in main ()
#14 0x40135736 in __libc_start_main () from /lib/libc.so.6