Mailing-List:	contact cygwin-help AT sourceware DOT cygnus DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-subscribe AT sources DOT redhat DOT com>
List-Archive:	<http://sources.redhat.com/ml/cygwin/>
List-Post:	<mailto:cygwin AT sources DOT redhat DOT com>
List-Help:	<mailto:cygwin-help AT sources DOT redhat DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender:	cygwin-owner AT sources DOT redhat DOT com
Delivered-To:	mailing list cygwin AT sources DOT redhat DOT com
Date:	Tue, 9 Oct 2001 21:42:03 +0400
From:	egor duda <deo AT logos-m DOT ru>
X-Mailer:	The Bat! (v1.53 RC/4)
Reply-To:	egor duda <cygwin AT cygwin DOT com>
Organization:	deo
X-Priority:	3 (Normal)
Message-ID:	<8122066680.20011009214203@logos-m.ru>
To:	John Peacock <jpeacock AT rowman DOT com>
CC:	cygwin AT cygwin DOT com
Subject:	Re: Perl 5.7.2
In-Reply-To:	<3BC333FF.23E05C83@rowman.com>
References:	<3BC30401 DOT 2D09A965 AT rowman DOT com> <3BC341F5 DOT 12093 DOT C1DD7 AT localhost>
	<20011009125532 DOT A24952 AT redhat DOT com> <3BC333FF DOT 23E05C83 AT rowman DOT com>
MIME-Version:	1.0

Hi!

Tuesday, 09 October, 2001 John Peacock jpeacock AT rowman DOT com wrote:

>> I suspect that there might be some problem with a misconfigured perl,
>> maybe?  I know that perl can use its own version of malloc.  I wonder
>> if some memory that is allocated by perl's malloc has been passed to
>> cygwin's malloc for freeing.  If so, then *boom*.

JP> That is a distinct possibility.  I could see that Perl_safesysfree was 
JP> being called, but all of those things should have been created with 
JP> Perl_safemalloc.  These are both wrappers around the system malloc()
JP> and free() so it is an avenue of investigation at least.  I'll look at
JP> the wrapper code and see if there is anything that has changed recently.

JP> But, would this mean that if miniperl is being run under gdb, there 
JP> would be no core dump?  Because that is the behavior I am seeing
JP> (once I downgraded to CygWin 1.3.2-2).

free() does not necessarily crash on wrong pointer. whether it crashes
or not depends heavily on heap layout, which certainly changes between
different dll versions.

Egor.            mailto:deo AT logos-m DOT ru ICQ 5165414 FidoNet 2:5020/496.19


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/

- Raw text -