From owner-freebsd-hackers  Tue Aug 28  9:16:37 2001
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From: Andrew Gallatin <gallatin@cs.duke.edu>
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Date: Tue, 28 Aug 2001 12:16:02 -0400 (EDT)
To: Steve Ames <steve@virtual-voodoo.com>
Cc: "David O'Brien" <obrien@FreeBSD.ORG>,
	Jim Bryant <kc5vdj@yahoo.com>, Charlie & <root@virtual-voodoo.com>,
	FreeBSD-hackers@FreeBSD.ORG
Subject: Re: TCSH bug...
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Steve Ames writes:
 > > We *do* know who that is.  This however is a more tcsh-specific issue,
 > > and raising it with the tcsh author would probably lead you to faster
 > > happiness.  Is there some reason you wont email him about this?
 > 
 > Except it isn't tcsh specific really. 
 > 
 > Our config.h in /usr/src/bin/csh defines SYSMALLOC. The port does not.
 > The port works, the system version doesn't. If you comment out SYSMALLOC
 > in /usr/src/bin/csh/config.h and recompile then the TCSH bug goes away.
 > 
 > Now you could argue that perhaps the definition of SYSMALLOC just exposes
 > a bug in tcsh? OTOH, since the system version in -STABLE also defines
 > SYSMALLOC and still manages to work... you could also argue that this points
 > to some other bug in -CURRENT... lastly it could be argued that I'm barking
 > up completely the wrong tree. *shrug*

Actually, it is a tcsh bug. Try playing with the MALLOC_OPTIONS
env. variable in -stable.  Specifically, set it to 'AJ' & I bet it will
drop core in -stable.  Eg:

	<12:10pm>thunder/gallatin:/tmp>uname -sr
	FreeBSD 4.4-RC
	<12:10pm>thunder/gallatin:/tmp>setenv MALLOC_OPTIONS 'AJ'
	<12:10pm>thunder/gallatin:/tmp>tcsh
	tcsh 6.10.00 (Astron) 2000-11-19 (alpha-digital-FreeBSD) options
	8b,nls,dl,al,kan,sm,rh,color,dspm
	<12:10pm>thunder/gallatin:/tmp>set rmstar
	<12:10pm>thunder/gallatin:/tmp>rm *
	Do you really want to delete all files? [n/y] n
	Segmentation fault (core dumped)

Note that -current has malloc options 'AJ' on by default to catch just
this kind of bug. 

Drew

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