[PHP-DEV] PHP 4.0 Bug #8446 Updated: PHP/apache process is in infinite loop or appears to suck CPU From: michael <email protected>
Date: 12/28/00

ID: 8446
User Update by: michael <email protected>
Old-Status: Feedback
Status: Open
Bug Type: *General Issues
Description: PHP/apache process is in infinite loop or appears to suck CPU

Below is the requested information on one of the processes. I am not running php with --enable-debug - is this a problem? Should I go back and recompile everything?
Thanks

Attaching to program: /usr/sbin/httpd, Pid 28916
0x2ac1ce2b in ?? ()
(gdb) bt
#0 0x2ac1ce2b in ?? ()
#1 0x2ac1cc94 in ?? ()
#2 0x80dcf59 in do_foreach_cont (value=0xb4b201c, key=0x2acbe8a0, as_token=0x80eecb8) at zend_compile.c:2095
#3 0x80dd41b in do_extended_fcall_begin () at zend_compile.c:2291
#4 0x807e708 in php_execute_script (primary_file=0x0) at main.c:1150
#5 0x807e6bb in php_execute_script (primary_file=0x81a5920) at main.c:1144
#6 0x807cdb5 in php_info_apache (zend_module=0x81ea024) at php_apache.c:269
#7 0x812556e in usage ()
#8 0x812b4fb in ap_read_request ()
#9 0x812e0b2 in ap_rprintf ()
#10 0x812e6fb in ap_send_error_response ()
#11 0x812ea78 in ap_send_error_response ()
#12 0x812efdd in check_safe_file ()
#13 0x812f607 in directory_walk ()
#14 0x2abbae21 in ?? ()

Previous Comments:
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[2000-12-28 05:31:37] derick <email protected>
Rasmus replyed:

We cannot possibly track this down for you based on this. You will need
to attach gdb to one of these looped processes and see where it is
looping.

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[2000-12-27 19:31:40] michael <email protected>
Below is a report from top for a SMP machine. This happens to all of our webservers every day or so a few machine have one two httpd processes eating CPU. This same problem also happens on the last two or more previous versions of php.

A simple kill -9 pid removes it w/o killing the whole webserver. Below are the apache and httpd configuration lines:

./configure --with-mysql --enable-track-vars --with-zlib --with-apache=$apachedir --with-gd=$gddir --with-jpeg-dir=$gddir --with-config-file-path=/common/globalconfig/php --enable-memory-limit

./configure --with-layout=production --activate-module=src/modules/php4/libphp4.a

An interesting aspect that is amount of memory each processing using 100% CPU is around 50megs. We have the memory limit set in php as 30M.

1 processes: 85 sleeping, 6 running, 0 zombie, 0 stopped
CPU0 states: 70.0% user, 4.0% system, 0.0% nice, 25.0% idle
CPU1 states: 53.0% user, 4.0% system, 0.0% nice, 41.0% idle
Mem: 1036464K av, 1006188K used, 30276K free, 149244K shrd, 32068K buff
Swap: 136512K av, 1124K used, 135388K free 677272K cached

  PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
 7763 nobody 9 0 53808 52M 2172 R 99.9 5.1 1527m httpd
 6825 nobody 0 0 4320 4320 2272 S 9.2 0.4 0:00 httpd
 6779 nobody 0 0 4912 4912 2276 S 6.4 0.4 0:00 httpd
 6830 root 4 0 1036 1036 812 R 6.4 0.0 0:00 top

Thanks for your help - this has been a real nagging problem for us that we keep thinking is resolved in the next version.

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Full Bug description available at: http://bugs.php.net/?id=8446 

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