From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 12438 invoked by alias); 18 Jan 2012 20:53:14 -0000 Received: (qmail 12429 invoked by uid 22791); 18 Jan 2012 20:53:13 -0000 X-SWARE-Spam-Status: No, hits=-2.9 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Wed, 18 Jan 2012 20:53:00 +0000 From: "jakub at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/51845] [4.7 regression] 23_containers/unordered_multimap/erase/24061-multimap.cc segfault Date: Wed, 18 Jan 2012 22:01:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: libstdc++ X-Bugzilla-Keywords: wrong-code X-Bugzilla-Severity: normal X-Bugzilla-Who: jakub at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 4.7.0 X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2012-01/txt/msg02034.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51845 --- Comment #19 from Jakub Jelinek 2012-01-18 20:52:27 UTC --- Other alternatives to fix this would be to add size_t __prev_bkt = _M_bucket_index(__prev_n); before the for (;;) loop and change the if (__n && __n_bkt != __bkt) test to if (__n && __prev_bkt != __n_bkt) or remove the __is_bucket_begin = true; line and do instead __is_bucket_begin = __n_bkt != __bkt; before the if (__n == __last_n) test and then test just __n && __is_bucket_begin after the for (;;) loop. But I think the patch I'm bootstrapping/regtesting right now is cheaper than that.