On Fri, Nov 10, 2017 at 6:41 PM, Douglas Duckworth <dod2014@xxxxxxxxxxxxxxx> wrote: > Hi > > I am running old PHP under Apache httpd-2.4. [...] > Though, ever few weeks, we see sudden increase in workers who never seem to > retire: > > [Fri Nov 10 02:43:20.019924 2017] [mpm_prefork:error] [pid 13584] AH00161: > server reached MaxRequestWorkers setting, consider raising the > MaxRequestWorkers setting > > user@server[/var/www]$ ps aux | grep [h]ttpd | wc -l > 257 If the php locks up while processing your request, no logs will be written. You may be running into a bug where circular, unresolvable dependencies for a lock prevent the processes from completing their requests. To check what's going on, install gdb, the debug info for your php and httpd and find the .gdbinfo that came with the httpd and php version you're using. Then attach gdb to any of the hanging processes (gdb `which httpd` PID), source both .gdbinit files, do a "zbacktrace" and a "bt full", and repeat for some other hanging processes. Depending on the type of lock, you may be able to identify the first process that has acquired that lock that all others are waiting for, and the php code and / or php module that causes it. rainer --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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