Tickets :: Comment on [#11041] PHP process hangs drawing 100% CPU until killed

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Comment	> Helo, > > since upgrading to IMP 5.X we experience the following issue: > > Sporadically one PHP process draws 100% CPU until it reaches > max_execution_time. This happens > 10 times per day on a busy System > serving >100k e-mail-accounts. php errorlog shows that the script > reaches max_execution time while it is in different parts of > imp/lib/Imap/Tree.php like this: > > [27-Feb-2012 10:59:07] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1709 > > You can find more lines from the errorlog below. > > strace on the process that draws 100% CPU does not show anything so > not syscalls are executed. > > Environment: PHP5.3.10, APC. (We got the same behaviour with 5.2.X > and eaccelerator) > > To further diagnose this issue we ran the attached patch > ("diagnose_patch.diff") > > This will alert us if a certain loop in Tree.php gets executed 1.000 > times and save print_r of debug_backtrace to a file. We have verified > at least one instance where this code gets triggered for a process > that suffers from the 100% CPU problem and gets killed after reaching > max_execution_time. You can find the output for this process in > "daignose_output.txt". > > As far as we can tell there seems to be loop in the code of Tree.php, > specifically in getPollList: The foreach does not ever seem to exit > in our case. > > Unfortunately we do not know how to continue in solving this problem. > Can you please point us into the right direction? We are willing to > run more diagnostic code to further narrow down the root cause of > this elusive problem. > > > > > > Some output from php errorlog: > > [27-Feb-2012 10:42:04] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 829 > [27-Feb-2012 10:43:13] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1708 > [27-Feb-2012 10:44:19] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/framework/Prefs/lib/Horde/Prefs.php > on line 317 > [27-Feb-2012 10:44:41] PHP Fatal error: Call to a member function > getName() on a non-object in horde-git/imp/lib/Ajax/Application.php > on line 1349 > [27-Feb-2012 10:44:52] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1827 > [27-Feb-2012 10:45:11] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1827 > [27-Feb-2012 10:45:52] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1676 > [27-Feb-2012 10:45:54] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1827 > [27-Feb-2012 10:45:59] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1279 > [27-Feb-2012 10:46:00] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1709 > [27-Feb-2012 10:46:04] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1277 > [27-Feb-2012 10:46:07] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1709 > [27-Feb-2012 10:46:07] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1709 > [27-Feb-2012 10:46:15] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in > horde-git/framework/Prefs/lib/Horde/Prefs/Scope.php on line 138 > [27-Feb-2012 10:46:16] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1277 > [27-Feb-2012 10:51:09] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1277 > [27-Feb-2012 10:51:11] PHP Fatal error: Call to a member function > getName() on a non-object in horde-git/imp/lib/Ajax/Application.php > on line 1349 > [27-Feb-2012 10:54:41] PHP Fatal error: Call to a member function > getName() on a non-object in horde-git/imp/lib/Ajax/Application.php > on line 1349 > [27-Feb-2012 10:57:34] PHP Fatal error: Call to a member function > getName() on a non-object in horde-git/imp/lib/Ajax/Application.php > on line 1349 > [27-Feb-2012 10:58:45] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1827 > [27-Feb-2012 10:58:50] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1826 > [27-Feb-2012 10:59:07] PHP Fatal error: Maximum execution time of > 300 seconds exceeded in horde-git/imp/lib/Imap/Tree.php on line 1709 >
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