From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 30770 invoked by alias); 25 May 2005 12:32:04 -0000 Mailing-List: contact gdb-help@sources.redhat.com; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sources.redhat.com Received: (qmail 30660 invoked by uid 22791); 25 May 2005 12:31:48 -0000 Received: from nevyn.them.org (HELO nevyn.them.org) (66.93.172.17) by sourceware.org (qpsmtpd/0.30-dev) with ESMTP; Wed, 25 May 2005 12:31:48 +0000 Received: from drow by nevyn.them.org with local (Exim 4.50) id 1Dav34-00013B-4T; Wed, 25 May 2005 08:31:46 -0400 Date: Wed, 25 May 2005 12:32:00 -0000 From: Daniel Jacobowitz To: Kaarthik Sivakumar Cc: gdb@sources.redhat.com Subject: Re: gdb and too many threads causes SIGTRAP Message-ID: <20050525123145.GA3917@nevyn.them.org> Mail-Followup-To: Kaarthik Sivakumar , gdb@sources.redhat.com References: <200505251551.06907.kaarthik@clovissolutions.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200505251551.06907.kaarthik@clovissolutions.com> User-Agent: Mutt/1.5.8i X-SW-Source: 2005-05/txt/msg00316.txt.bz2 On Wed, May 25, 2005 at 03:51:06PM -0700, Kaarthik Sivakumar wrote: > Hi > > We are developing a multi-threaded application on RH9 which creates and > deletes a large number of threads in a short time. After this program runs > for sometime, gdb fails with a SIGTRAP in a thread that is at > __ntpl_death_event() (when the thread wants to quit). Following some of the > mails at gdb-patches, I noticed a thread (subject: [RFC]: fix for recycled > thread ids) that seems to address this issue. > > According to that mail thread, and this specific mail > http://sources.redhat.com/ml/gdb-patches/2004-03/msg00672.html, a fix was > issued to check for TD_DEATH when possible and to attach to threads sooner > when thread ids are being reused. This fix seems to be available in gdb > 6.2.1, so we used that to debug the application. But this still does not seem > to have fixed the problem. I can confirm that the code to test for TD_DEATH > is activated and that glibc version is 2.3.2, so this fix should apply and > work. But it doesnt. > > Is there anything else I should be checking? If you need more information, > please let me know. The OS is RH 9, with just the gdb 6.2.1 tar.bz2 compiled > and being used. Thanks. If you are compiling a new version of GDB anyway, please try a more current release - if possible, a current CVS snapshot. After that, if you still have trouble, it may be a kernel problem. Current versions of GDB should not have this problem. -- Daniel Jacobowitz CodeSourcery, LLC