From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 0BD98384B13D; Mon,  5 Apr 2021 14:49:06 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 0BD98384B13D
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug analyzer/99886] Delay loop in -fanalyzer seen on
 gcc.dg/analyzer/malloc-1.c with -fanalyzer-verbosity=0
Date: Mon, 05 Apr 2021 14:49:05 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: analyzer
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: cvs-commit at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: dmalcolm at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-99886-4-1ulfRuroSh@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-99886-4@http.gcc.gnu.org/bugzilla/>
References: <bug-99886-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Mon, 05 Apr 2021 14:49:06 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99886

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by David Malcolm <dmalcolm@gcc.gnu.org>:

https://gcc.gnu.org/g:69b66ff02353a87585329bb3cf4ac20d6dee1b16

commit r11-7987-g69b66ff02353a87585329bb3cf4ac20d6dee1b16
Author: David Malcolm <dmalcolm@redhat.com>
Date:   Mon Apr 5 10:48:01 2021 -0400

    analyzer: fix apparent hang with -fanalyzer-verbosity=3D0 [PR analyzer/=
99886]

    The analyzer appeared to enter an infinite loop on malloc-1.c
    when -fanalyzer-verbosity=3D0 was used.  In fact, it was slowly
    counting from 0 to 0xffffffff.

    Root cause is looping up to effectively ((unsigned)0) - 1 in
    diagnostic_manager::consolidate_conditions when there are no events
    in the path.

    Fixed by the following, which uses signed integers when subtracting
    from path->num_events () when simplifying checker_paths.

    gcc/analyzer/ChangeLog:
            PR analyzer/99886
            * diagnostic-manager.cc
            (diagnostic_manager::prune_interproc_events): Use signed intege=
rs
            when subtracting one from path->num_events ().
            (diagnostic_manager::consolidate_conditions): Likewise.  Convert
            next_idx to a signed int.

    gcc/testsuite/ChangeLog:
            PR analyzer/99886
            * gcc.dg/analyzer/pr99886.c: New test.=