Bug #61083 [Opn->Csd]: Apache/mod_php ignores SIGHUP
Edit report at https://bugs.php.net/bug.php?id=61083&edit=1
ID: 61083
Updated by: laruence@php.net
Reported by: dmitry@php.net
Summary: Apache/mod_php ignores SIGHUP
-Status: Open
+Status: Closed
Type: Bug
Package: Scripting Engine problem
Operating System: Linux
PHP Version: 5.4SVN-2012-02-14 (SVN)
Block user comment: N
Private report: N
New Comment:
Automatic comment on behalf of laruence
Revision: http://git.php.net/?p=php-src.git;a=commit;h=fd5a756ad44124ffa7e9a5810a31ff49e91708cf
Log: Revive Zend Signals handler (and fixed bug #61083)
Previous Comments:
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[2012-02-14 14:34:00] dmitry@php.net
Description:
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Test Case
---------
1) Just start Apache with mod_php
2) generate some load (e.g. ab -t 120 http://.../hello.php)
3) run 'apachectl restart' for few times
4) 'apachectl stop'
5) Check Apache error_log
You will see warning and error messages:
[warn] child process 15317 still did not exit, sending a SIGTERM
[error] child process 15317 still did not exit, sending a SIGKILL
The reason of these errors is the fact that Apache/mod_php worker processws ignore SIGHIP and the
main Apache process kills them using SIGTERM or SIGKILL.
I tried to analyze and debug zend_signal.c and found very wired behavior.
On first request zend_signal_activate() sets its own signal handler for SIGHUP and stores the
original handler in SIGG(handlers)[SIGHUP-1].handler, but on second request the same
zend_signal_activate() overwrites the original signal handler by handler from parent process.
zend_signal.c:284
memcpy(&SIGG(handlers), &global_orig_handlers, sizeof(global_orig_handlers));
As result the original signal handler for SIGHUP is never called.
Even worse after restart and two request SIGG(handlers)[SIGHUP-1].handler becomes SIG_IGN and SIGHUP
is ignored at all.
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Edit this bug report at https://bugs.php.net/bug.php?id=61083&edit=1
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