DragonFly bugs List (threaded) for 2012-04
[DragonFlyBSD - Bug #2349] fork() after signal(SIGCHLD, SIG_IGN) produces zombies
Issue #2349 has been updated by Matthias Rampke.
File dragonfly-SIGCHLD.patch added
% Done changed from 0 to 50
Here's a patch against master I cargoculted from FreeBSD-current, taking the patches in that old thread as pointers. The kernel boots and works for me and the test case no longer generates zombie processes.
Bug #2349: fork() after signal(SIGCHLD, SIG_IGN) produces zombies
Author: Matthias Rampke
The code in the attached zombifier.c makes every exiting child into a zombie on master. This doesn't happen on any non-DragonFly system I could test it on, and from what I gather from this discussion 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 relies on this behaviour and I couldn't SSH into my server as a non-root user due to PID exhaustion.
 DragonFly zz.2pktfkt.net 3.1-DEVELOPMENT DragonFly v18.104.22.1685.g4c42b-DEVELOPMENT #6: Tue Apr 17 21:24:31 CEST 2012 firstname.lastname@example.org:/usr/obj/usr/src/sys/X86_64_GENERIC x86_64
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