Bug #3659: mod_php + apache w/mod_so hangs in sched_yield

From: chrism@ticam.utexas.edu Operating system: redhat linux 5.2 PHP version: 3.0.15 PHP Bug Type: Dynamic loading related Bug description: mod_php + apache w/mod_so hangs in sched_yield i experienced very vexing behavior from php-3.0.{14,15} under apache 1.3.{11,12}. some details on setup: redhat-5.2/x86, kernel 2.2.14, all security and kernel-2.2 requirements from redhat are the only changes to the stock install. apache: configured with '--enable-module=all' php: configured with '--with-mysql'. (installed separately after apache) stock php3.ini file copied from php3.ini-dist w/no changes apache works a-ok until i activate the php3 module with the LoadModule directive; after that the parent (running-as-root) httpd will fork a child, but will itself loop in sched_yield (according to strace) while the child never does anything (including get any brothers or sisters). the parent is at this point eating all CPU and doing nothing but sched_yield'ing an example strace output is available at: http://www.ticam.utexas.edu/~chrism/php_strace as httpd never crashed, there is no corefile available. building php3 into httpd cures the problem, and that's what i resorted to. this appears to be the same bug as ID #1043, except that mod_ssl is not involved, and bug #1043 got closed without any apparent resolution, so i am opening another. again, my problem has been solved by avoiding the DSO setup, but it took me a long time to get around to trying it and i was about to tears by that point.