bin/55346: /bin/sh eats memory and CPU infinitely

[Eugene Grosbein]

The following reply was made to PR bin/55346; it has been noted by GNATS.

From: Eugene Grosbein <eugen at kuzbass.ru>
To: Doug White <dwhite at gumbysoft.com>
Cc: Eugene Grosbein <eugen at grosbein.pp.ru>, stable at freebsd.org,
	bug-followup at freebsd.org
Subject: Re: bin/55346: /bin/sh eats memory and CPU infinitely
Date: Fri, 15 Aug 2003 11:14:31 +0800

 Doug White wrote:
 
 > > It seems /bin/sh in 4.8-STABLE has problem with SIGCHLD processing.
 > > In short, it often fails to process it correctly, zombies float
 > > around, jobs are not marked as finished in jobtab[] that fills memory
 > > and takes much CPU to be processed.
 > >
 > > Run this one-liner using /bin/sh and see hundreds of zombies:
 > >
 > > #!/bin/sh
 > > while :; do : & done
 > 
 > Considering that with this script you are forkbombing your machine as
 > root, I think this falls into the "doctor it hurts when I shoot my foot"
 > category.
 
 Perhaps. Anyway, debug shows that jobtab[] in /bin/sh grows indefinitely
 in some scenarios and the reason should be SIGCHLD processing problem.
 
 Eugene