Hello, I'm seeing a problem with an installation of PHP4/Apache2 and I don't know where the cause of the problem is.
I'm using the Debian Sarge versions of apache2/php4 which are ii libapache2-mod-php4 4.3.10-16 ii apache2-mpm-prefork 2.0.54-5 I have the problem that sometimes an apache-Process is locking a PHP-Session file and is "hanging" in a poll() without releasing the lock. All other apache processes are trying to FLOCK the file and hang too. I don't know what is causing that effect, two backtraces of the apache2 processes showed the following: (gdb) bt #0 0xb7bfe4d9 in poll () from /lib/tls/libc.so.6 #1 0xb7ccc4fd in apr_poll () from /usr/lib/libapr-0.so.0 #2 0xb7cccc33 in apr_wait_for_io_or_timeout () from /usr/lib/libapr-0.so.0 #3 0xb7cc224f in apr_socket_sendv () from /usr/lib/libapr-0.so.0 #4 0xb7cc26c4 in apr_sendv () from /usr/lib/libapr-0.so.0 #5 0x0808da52 in ap_add_output_filters_by_type () #6 0x0808eff7 in ap_core_translate () #7 0x08086111 in ap_pass_brigade () #8 0x08086111 in ap_pass_brigade () #9 0x080676d1 in ap_http_header_filter () #10 0x08086111 in ap_pass_brigade () #11 0x08088bae in ap_content_length_filter () #12 0x08086111 in ap_pass_brigade () #13 0x08069128 in ap_byterange_filter () #14 0x08086111 in ap_pass_brigade () #15 0xb7e11c94 in apr_brigade_write () from /usr/lib/libaprutil-0.so.0 #16 0x08088f8d in ap_old_write_filter () #17 0x0808909b in ap_rwrite () #18 0xb7857128 in execute () from /usr/lib/apache2/modules/libphp4.so #19 0xb7826585 in php_ob_get_length () from /usr/lib/apache2/modules/libphp4.so #20 0x0888fbac in ?? () #21 0x000063d7 in ?? () #22 0xbfdb0608 in ?? () #23 0xb79e8274 in ?? () from /usr/lib/apache2/modules/libphp4.so #24 0xb79ed4a0 in phpinfo_logo_hash () from /usr/lib/apache2/modules/libphp4.so #25 0xbfdb0690 in ?? () #26 0xbfdb0628 in ?? () #27 0xb782664f in php_ob_get_length () from /usr/lib/apache2/modules/libphp4.so #28 0x0888fbac in ?? () #29 0x000063d7 in ?? () #30 0xb7c61840 in __after_morecore_hook () from /lib/tls/libc.so.6 #31 0xb7c61840 in __after_morecore_hook () from /lib/tls/libc.so.6 #32 0xb79e8274 in ?? () from /usr/lib/apache2/modules/libphp4.so #33 0x087ebe5c in ?? () #34 0xbfdb0648 in ?? () #35 0xb78253b9 in php_body_write () from /usr/lib/apache2/modules/libphp4.so Previous frame inner to this frame (corrupt stack?) and (gdb) bt #0 0xb7bfe4d9 in poll () from /lib/tls/libc.so.6 #1 0xb7ccc4fd in apr_poll () from /usr/lib/libapr-0.so.0 #2 0xb7cccc33 in apr_wait_for_io_or_timeout () from /usr/lib/libapr-0.so.0 #3 0xb7cc224f in apr_socket_sendv () from /usr/lib/libapr-0.so.0 #4 0xb7cc26c4 in apr_sendv () from /usr/lib/libapr-0.so.0 #5 0x0808da52 in ap_add_output_filters_by_type () #6 0x0808eff7 in ap_core_translate () #7 0x08086111 in ap_pass_brigade () #8 0x08086111 in ap_pass_brigade () #9 0x080676d1 in ap_http_header_filter () #10 0x08086111 in ap_pass_brigade () #11 0x08088bae in ap_content_length_filter () #12 0x08086111 in ap_pass_brigade () #13 0x08069128 in ap_byterange_filter () #14 0x08086111 in ap_pass_brigade () #15 0xb7e11c94 in apr_brigade_write () from /usr/lib/libaprutil-0.so.0 #16 0x08088f8d in ap_old_write_filter () #17 0x0808909b in ap_rwrite () #18 0xb7857128 in execute () from /usr/lib/apache2/modules/libphp4.so #19 0xb7826585 in php_ob_get_length () from /usr/lib/apache2/modules/libphp4.so #20 0x0891a674 in ?? () #21 0x00006c93 in ?? () #22 0xbfdb3108 in ?? () #23 0xb79e8274 in ?? () from /usr/lib/apache2/modules/libphp4.so #24 0xb79ed4a0 in phpinfo_logo_hash () from /usr/lib/apache2/modules/libphp4.so #25 0x00000000 in ?? () #26 0xbfdb3128 in ?? () #27 0xb782664f in php_ob_get_length () from /usr/lib/apache2/modules/libphp4.so #28 0x0891a674 in ?? () #29 0x00006c93 in ?? () #30 0xb7ba1e24 in mallopt () from /lib/tls/libc.so.6 After 3-5 minutes the process will return from the poll and deliver the site. Has anyone any ideas how to solve that problem? I've never seen such a problem before. With kind regards, Sebastian -- GPG Key-ID: 0x76B79F20 (0x1B6034F476B79F20) Wehret den Anfaengen: http://odem.org/informationsfreiheit/ 'Are you Death?' ... IT'S THE SCYTHE, ISN'T IT? PEOPLE ALWAYS NOTICE THE SCYTHE. -- Terry Pratchett, The Fifth Elephant -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
