[DragonFlyBSD - Bug #2349] (Resolved) fork() after signal(SIGCHLD, SIG_IGN) produces zombies

[Francois Tigeot via Redmine]

Issue #2349 has been updated by Francois Tigeot.

Status changed from New to Resolved
% Done changed from 50 to 100

Patch committed, thanks!
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Bug #2349: fork() after signal(SIGCHLD, SIG_IGN) produces zombies
http://bugs.dragonflybsd.org/issues/2349

Author: Matthias Rampke
Status: Resolved
Priority: Normal
Assignee: 
Category: 
Target version: 


The code in the attached zombifier.c makes every exiting child into a zombie on master[1]. This doesn't happen on any non-DragonFly system I could test it on, and from what I gather from this discussion[2] and what Wikipedia says about SUSv3/POSIX-1.2001 the correct behaviour is not to keep them around if the SIGCHLD handler is explicitly set to SIG_IGN.

This has realworldly bitten me because the FCGI-to-CGI-wrapper I use[4] relies on this behaviour and I couldn't SSH into my server as a non-root user due to PID exhaustion.

[1] DragonFly zz.2pktfkt.net 3.1-DEVELOPMENT DragonFly v3.1.0.545.g4c42b-DEVELOPMENT #6: Tue Apr 17 21:24:31 CEST 2012     matthias at zz.2pktfkt.net:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64
[2] http://markmail.org/message/3s4jj7dpgw34yvmh
[3] http://en.wikipedia.org/wiki/Zombie_process
[4] http://pkgsrc.se/wip/fcgiwrap


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