From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 5176 invoked by alias); 24 Jul 2002 21:36:01 -0000 Mailing-List: contact gcc-prs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-prs-owner@gcc.gnu.org Received: (qmail 5158 invoked by uid 71); 24 Jul 2002 21:36:01 -0000 Resent-Date: 24 Jul 2002 21:36:01 -0000 Resent-Message-ID: <20020724213601.5157.qmail@sources.redhat.com> Resent-From: gcc-gnats@gcc.gnu.org (GNATS Filer) Resent-To: nobody@gcc.gnu.org Resent-Cc: gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org Resent-Reply-To: gcc-gnats@gcc.gnu.org, lclay@ecustomers.com Received: (qmail 2629 invoked by uid 61); 24 Jul 2002 21:28:06 -0000 Message-Id: <20020724212806.2628.qmail@sources.redhat.com> Date: Wed, 24 Jul 2002 14:36:00 -0000 From: lclay@ecustomers.com Reply-To: lclay@ecustomers.com To: gcc-gnats@gcc.gnu.org X-Send-Pr-Version: gnatsweb-2.9.3 (1.1.1.1.2.31) Subject: other/7399: Exception object destructors called pre-maturely. X-SW-Source: 2002-07/txt/msg00662.txt.bz2 List-Id: >Number: 7399 >Category: other >Synopsis: Exception object destructors called pre-maturely. >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Wed Jul 24 14:36:01 PDT 2002 >Closed-Date: >Last-Modified: >Originator: Larry Clay; Ecustomers Inc. >Release: g++ 2.96 >Organization: >Environment: linux 2.4.2-2 #1 on i686 >Description: The context of this bug is a method that throws an exception containing an error message and a calling method that "catch"es the exception. The exception object "news" some memory in its constructor, and "deletes" it in its destructor. The destructor is called and the memory is deleted in the method that does the throw. Thus the catching method gets an exception object with a corrupted message buffer. For what its worth... the program the test program was based on works on windows when compiled with the visual c++ compiler. The test program fails on both linux and cygwin. >How-To-Repeat: Compile and run the program that comprises the second part of the attachment. Set and export the environment variable "MALLOC_CHECK_=1". When the test program is run, usually the message attached to the exception object has been corrupted when it is caught. Also, MALLOC_CHECK will report that the message buffer is free'd after already being free'd. >Fix: I worked around this in our production code by giving the exception object a fixed length buffer that it can store the exception error message in. >Release-Note: >Audit-Trail: >Unformatted: ----gnatsweb-attachment---- Content-Type: text/x-csrc; name="OUT" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="OUT" UmVhZGluZyBzcGVjcyBmcm9tIC91c3IvbGliL2djYy1saWIvaTM4Ni1yZWRoYXQtbGludXgvMi45 Ni9zcGVjcwpnY2MgdmVyc2lvbiAyLjk2IDIwMDAwNzMxIChSZWQgSGF0IExpbnV4IDcuMSAyLjk2 LTgxKQogL3Vzci9saWIvZ2NjLWxpYi9pMzg2LXJlZGhhdC1saW51eC8yLjk2L2NwcDAgLWxhbmct YysrIC1EX19HTlVHX189MiAtRF9fRVhDRVBUSU9OUyAtdiAtRF9fR05VQ19fPTIgLURfX0dOVUNf TUlOT1JfXz05NiAtRF9fR05VQ19QQVRDSExFVkVMX189MCAtRF9fRUxGX18gLUR1bml4IC1EbGlu dXggLURfX0VMRl9fIC1EX191bml4X18gLURfX2xpbnV4X18gLURfX3VuaXggLURfX2xpbnV4IC1B c3lzdGVtKHBvc2l4KSAtQWNwdShpMzg2KSAtQW1hY2hpbmUoaTM4NikgLURpMzg2IC1EX19pMzg2 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