bin/90334: /bin/sh trap problem

[Dmitriy Kirhlarov]

>Number:         90334
>Category:       bin
>Synopsis:       /bin/sh trap problem
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Dec 13 14:40:02 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Dmitriy Kirhlarov
>Release:        FreeBSD 5.4-STABLE i386
>Organization:
dimma
>Environment:
System: FreeBSD dimma.mow.oilspace.com 5.4-STABLE FreeBSD 5.4-STABLE #0: Sun Sep 25 23:26:13 MSD 2005 root at dimma.mow.oilspace.com:/usr/obj/usr/src/sys/dimma i386

FreeBSD fbsd.mow.oilspace.com 6.0-STABLE FreeBSD 6.0-STABLE #6: Thu Nov 24 15:26:53 GMT 2005     root at fbsd.mow.oilspace.com:/usr/obj/usr/src/sys/oilspace  i386

>Description:
	on FreeBSD 5.* and FreeBSD 6.* sh scripts hanging with high
	CPU load, when SIGCHLD used.
	problem not present on 4-STABLE
>How-To-Repeat:
	run simple script
---
	#!/bin/sh
	trap "" 20
	var=`echo anytext | sed 's/text/any/'`
---

>Fix:

	don't know


>Release-Note:
>Audit-Trail:
>Unformatted: