From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-376821-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 14816 invoked by alias); 13 Dec 2011 16:33:46 -0000
Received: (qmail 14762 invoked by uid 22791); 13 Dec 2011 16:33:42 -0000
X-SWARE-Spam-Status: No, hits=-2.5 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00,SUBJ_OBFU_PUNCT_MANY
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; Tue, 13 Dec 2011 16:33:29 +0000
From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/51529] New: gfortran.dg/class_to_type_1.f03 is miscompiled: Uninitialized variable used
Date: Tue, 13 Dec 2011 17:46:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: burnus at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-51529-4@http.gcc.gnu.org/bugzilla/>
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: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2011-12/txt/msg01387.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51529

             Bug #: 51529
           Summary: gfortran.dg/class_to_type_1.f03 is miscompiled:
                    Uninitialized variable used
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: burnus@gcc.gnu.org
                CC: pault@gcc.gnu.org


$ gfortran -g gfortran.dg/class_to_type_1.f03
$ MALLOC_PERTURB_= ./a.out
$ MALLOC_PERTURB_=33 ./a.out

A fatal error occurred! Backtrace for this error:
...
#6  0x400929 in __copy_MAIN___T2 at class_to_type_1.f03:5
#7  0x4013D1 in MAIN__ at class_to_type_1.f03:17


That's a typical sign for code which requires that "malloc" returns '\0'-set
memory, i.e. gfortran generates code which uses an uninitialized variable.