From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 7164 invoked by alias); 9 Jan 2019 10:46:10 -0000 Mailing-List: contact gcc-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-owner@gcc.gnu.org Received: (qmail 126552 invoked by uid 89); 9 Jan 2019 10:45:57 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_LOW,TIME_LIMIT_EXCEEDED autolearn=unavailable version=3.3.2 spammy=H*i:sk:5C35C2A, H*f:sk:5C35C2A, HContent-Transfer-Encoding:8bit X-HELO: mout.gmx.net Received: from mout.gmx.net (HELO mout.gmx.net) (212.227.15.19) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Wed, 09 Jan 2019 10:45:46 +0000 Received: from [10.2.7.137] ([62.213.40.60]) by mail.gmx.com (mrgmx002 [212.227.17.184]) with ESMTPSA (Nemesis) id 0MaqeA-1h1TMm1EPC-00KTBY; Wed, 09 Jan 2019 11:45:30 +0100 Subject: Re: Garbage collection bugs To: Joern Wolfgang Rennecke , "gcc@gcc.gnu.org >> GCC Development" References: <5C35C2AE.7080001@riscy-ip.com> From: Arseny Solokha Message-ID: <429b79cc-a665-6b25-9471-00f4de36321b@gmx.com> Date: Wed, 09 Jan 2019 10:46:00 -0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <5C35C2AE.7080001@riscy-ip.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-IsSubscribed: yes X-SW-Source: 2019-01/txt/msg00049.txt.bz2 > First problem: > > The g++.dg/pr85039-2.C tests (I've looked in detail at -std=c++98, but > -std=c++11 and -std=c++14 appear to follow the same pattern) see gcc > garbage-collecting a live vector.  A subsequent access to the vector with > vec_quick_push causes a segmentation fault, as m_vecpfx.m_num is 0xa5a5a5a5 . > The vec data is also being freed / poisoned. The vector in question is an > auto-variable of cp_parser_parenthesized_expression_list, which is declared as: > vec *expression_list; It looks like PR88180 to me.