From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <glibc-bugs-return-16506-listarch-glibc-bugs=sources.redhat.com@sourceware.org>
Received: (qmail 4779 invoked by alias); 20 Aug 2012 03:26:54 -0000
Received: (qmail 4771 invoked by uid 22791); 20 Aug 2012 03:26:53 -0000
X-SWARE-Spam-Status: No, hits=-2.5 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00,URI_HEX
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO sourceware.org) (127.0.0.1)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Mon, 20 Aug 2012 03:26:41 +0000
From: "vapier at gentoo dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug network/14498] New: default /var/db/services.db triggers infinite CPU loop with getaddrinfo()
Date: Mon, 20 Aug 2012 03:26:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: glibc
X-Bugzilla-Component: network
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: vapier at gentoo dot org
X-Bugzilla-Status: NEW
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at sourceware dot org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-14498-131@http.sourceware.org/bugzilla/>
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Mailing-List: contact glibc-bugs-help@sourceware.org; run by ezmlm
Precedence: bulk
List-Id: <glibc-bugs.sourceware.org>
List-Subscribe: <mailto:glibc-bugs-subscribe@sourceware.org>
List-Post: <mailto:glibc-bugs@sourceware.org>
List-Help: <mailto:glibc-bugs-help@sourceware.org>, <http://sourceware.org/lists.html#faqs>
Sender: glibc-bugs-owner@sourceware.org
X-SW-Source: 2012-08/txt/msg00120.txt.bz2

http://sourceware.org/bugzilla/show_bug.cgi?id=14498

             Bug #: 14498
           Summary: default /var/db/services.db triggers infinite CPU loop
                    with getaddrinfo()
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
        AssignedTo: unassigned@sourceware.org
        ReportedBy: vapier@gentoo.org
                CC: toolchain@gentoo.org
    Classification: Unclassified
              Host: x86_64-linux-gnu


using the default /var/db/Makefile provided by glibc:
cd /var/db
rm -f *.db
make

then running a simple getaddrinfo() request:
wget https://432020.bugs.gentoo.org/attachment.cgi?id=321736 -O test.c
gcc test.c
./a.out
<hang>

seems like we trigger an infinite cpu loop somewhere in the look up logic

(all details and example code provided by Maxim Kammerer)

reproduced with glibc-2.15 and 2.16

-- 
Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.