Bug 43696

Summary:	race condition when trying to shutdown httpd immediately after starting it
Product:	Apache httpd-2	Reporter:	Arun Bhalla <arun>
Component:	mpm_prefork	Assignee:	Apache HTTPD Bugs Mailing List <bugs>
Status:	RESOLVED FIXED
Severity:	normal	Keywords:	FixedInTrunk, PatchAvailable
Priority:	P2
Version:	2.2.3
Target Milestone:	---
Hardware:	All
OS:	other
Attachments:	patch to prefork.c

Description Arun Bhalla 2007-10-24 15:52:12 UTC

This was first noticed while using httpd 2.2.3 on Solaris SPARC, but the bug is
still present in httpd 2.2.6 and could surface on any platform using prefork.

The issue is that the signal handlers are installed before the restart_pending
and shutdown_pending variables are initialized.  If httpd receives SIGTERM while
child processes are being spawned, it will be completely ignored.  The following
two commands, one immediately called after the other, can reproduce the situation:

  httpd -k start
  httpd -k stop

Comment 1 Arun Bhalla 2007-10-24 15:53:09 UTC

Created attachment 21040 [details]
patch to prefork.c

Comment 2 Stefan Fritsch 2011-07-26 20:38:48 UTC

fixed in trunk in r1151233

Comment 3 Stefan Fritsch 2012-02-26 16:46:49 UTC

fixed in 2.4.1