/bin/sh eats memory and CPU infinitely

[Eugene Grosbein]

>Submitter-Id:	current-users
>Originator:	Eugene Grosbein
>Organization:	JSC Svyaz-Service
>Confidential:	no
>Synopsis:	/bin/sh eats memory and CPU infinitely
>Severity:	serious
>Priority:	medium
>Category:	bin
>Class:		sw-bug
>Release:	FreeBSD 4.8-STABLE i386
>Environment:
System: FreeBSD grosbein.pp.ru 4.8-STABLE FreeBSD 4.8-STABLE #3: Wed Aug 6 21:50:36 KRAST 2003 eu at grosbein.pp.ru:/usr/local/obj/usr/local/src/sys/DADV i386
	CPUTYPE=i686 and no other optimizations
	
>Description:
	/bin/sh leaks memory and can eat all CPU cycles when
	it become very big.

>How-To-Repeat:

	Test script is 15K in size so it comes gzipped
	and uuencoded. Yes, it is compressed very well.

begin 644 test.sh.gz
M'XL(`"5H,C\"`^W3P0F#`!``L/]-<2+T*WYUF^*!@FBI%=<O=(B"D.R0MNF>
MR]8=<\0U+VOEYWU6CCGMD3]#]L!-Y$-<$!<0%Q`7Q`7$!<0%<0%Q`7%!7$!<
;0%Q`7!`7^&_<8ZUZ91_3OE5\`=@<)[J\.P``
`
end
		
	Run it and watch how /bin/sh slowly increases
	its SIZE, RES, WCPU and CPU values.

	This is an exapmle. My real script grows upto 70Mb in size
	and eats all of idle Pentium-III 866Mhz cycles, it is
	machine-generated and runs 24x7x365. It's twice smaller
	than this test case.
	Now I have to restart it from time to time.

>Fix:

	Unknown for me.

Eugene Grosbein