php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #68229 FastCGI process management doesn't work if SIGCHLD is inherited as SIG_INT
Submitted: 2014-10-15 01:16 UTC Modified: -
From: fredrik at dolda2000 dot com Assigned:
Status: Open Package: CGI/CLI related
PHP Version: master-Git-2014-10-15 (Git) OS: Any POSIX
Private report: No CVE-ID: None
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: fredrik at dolda2000 dot com
New email:
PHP Version: OS:

 

 [2014-10-15 01:16 UTC] fredrik at dolda2000 dot com 
Description:
------------
If PHP is started in FastCGI mode managing several child workers, and the SIGCHLD handler is inherited as SIG_IGN from the parent process, the wait() loop doesn't work as intended, since wait() does not report auto-reaped children.

Instead, it will start looping indefinitely once all children have exited, since wait() will start returning ECHILD before exit_signal has been set, eating CPU until killed.

Inheriting SIGCHLD as SIG_IGN may arguably be a rare condition, but it probably doesn't hurt to reset it to SIG_DFL, since PHP does depend on it for proper behavior.

Patches

Pull Requests
 
PHP Copyright © 2001-2025 The PHP Group
All rights reserved. 		Last updated: Wed Jul 09 09:01:35 2025 UTC