From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 22659 invoked by alias); 12 Sep 2011 21:33:31 -0000 Received: (qmail 22650 invoked by uid 22791); 12 Sep 2011 21:33:30 -0000 X-SWARE-Spam-Status: No, hits=-2.8 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,TW_RW 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, 12 Sep 2011 21:33:17 +0000 From: "bugdal at aerifal dot cx" To: glibc-bugs@sources.redhat.com Subject: [Bug nptl/13184] rwlocks can go into dead lock Date: Mon, 12 Sep 2011 21:33:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: glibc X-Bugzilla-Component: nptl X-Bugzilla-Keywords: X-Bugzilla-Severity: critical X-Bugzilla-Who: bugdal at aerifal dot cx X-Bugzilla-Status: NEW X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: drepper.fsp at gmail dot com X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: CC Message-ID: In-Reply-To: References: 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: List-Subscribe: List-Post: List-Help: , Sender: glibc-bugs-owner@sourceware.org X-SW-Source: 2011-09/txt/msg00067.txt.bz2 http://sourceware.org/bugzilla/show_bug.cgi?id=13184 Rich Felker changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |bugdal at aerifal dot cx --- Comment #1 from Rich Felker 2011-09-12 21:32:43 UTC --- Please fix your test case; as is, it's invalid because it invokes undefined behavior as soon as thread_main tries to read automatic storage from spawn_threads which may have already returned. (I'm getting immediate assertion failure in cache_get due to n containing nonsense.) You could fix this by passing n by value (casting it to (void *)) rather than by reference. I'm very interested in race condition bugs like this since I'm writing a threads implementation and bugs in glibc/NPTL often end up either pointing to similar bugs in my code, or lead to ideas for superior implementations. But I'm not yet convince you've found a bug, since your test code is at least mildly buggy... -- 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.