From owner-freebsd-threads@FreeBSD.ORG Sun Oct 19 14:50:55 2003 Return-Path: Delivered-To: freebsd-threads@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id D04C616A4B3 for ; Sun, 19 Oct 2003 14:50:55 -0700 (PDT) Received: from mail.pcnet.com (mail.pcnet.com [204.213.232.4]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1BCEE43F75 for ; Sun, 19 Oct 2003 14:50:55 -0700 (PDT) (envelope-from eischen@vigrid.com) Received: from mail.pcnet.com (mail.pcnet.com [204.213.232.4]) by mail.pcnet.com (8.12.10/8.12.1) with ESMTP id h9JLosBR027134; Sun, 19 Oct 2003 17:50:54 -0400 (EDT) Date: Sun, 19 Oct 2003 17:50:54 -0400 (EDT) From: Daniel Eischen X-Sender: eischen@pcnet5.pcnet.com To: Morten Rodal In-Reply-To: <20031019183129.GA94145@slurp.rodal.no> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: threads@freebsd.org Subject: Re: libkse and bus error X-BeenThere: freebsd-threads@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Threading on FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 19 Oct 2003 21:50:56 -0000 On Sun, 19 Oct 2003, Morten Rodal wrote: > On Sun, Oct 19, 2003 at 02:16:27PM -0400, Daniel Eischen wrote: > > On Sun, 19 Oct 2003, Morten Rodal wrote: > > > > > I seem to be able to crash almost every pthread program that uses > > > pthread_mutex'es. First I thought it was a problem with > > > pthread_testcancel(), until I compiled libkse with DEBUG_FLAGS=-g on > > > one of machines. > > > > > > Backtrace from a machine with DEBUG_FLAGS=-g and libkse: > > > > > > #0 0x28e6ed1b in kse_thr_interrupt () at {standard input}:15 > > > #1 0x28e5f990 in _thr_sig_add (pthread=0x81fab00, sig=136293172, > > > info=0x0) > > > at /usr/src/lib/libpthread/thread/thr_sig.c:885 > > > #2 0x28e687cb in kse_check_completed (kse=0x81fab00) > > > at /usr/src/lib/libpthread/thread/thr_kern.c:1558 > > > #3 0x28e6721c in kse_sched_multi (kmbx=0x17e) > > > at /usr/src/lib/libpthread/thread/thr_kern.c:1021 > > > > This is a problem. The mailbox pointer is invalid. > > > > I thought it looked a bit strange. Any clues to what might have > caused this? When I've seen it before, it's when %gs becomes corrupted. Nvidia uses static ldt allocation and this can screw things up. If you are getting any static ldt allocations out of the kernel, that is the problem. > > > > One machine is running a kernel from > > > > > > FreeBSD slurp.rodal.no 5.1-CURRENT FreeBSD 5.1-CURRENT #3: Tue Oct 14 20:47:45 CEST 2003 root@slurp.rodal.no:/usr/obj/usr/src/sys/slurp i386 > > > > > > the other from > > > > > > FreeBSD hauk10.idi.ntnu.no 5.1-CURRENT FreeBSD 5.1-CURRENT #2: Fri Sep 26 09:12:55 CEST 2003 root@hauk10.idi.ntnu.no:/usr/obj/usr/src/sys/hauk10 i386 > > > > > > > > > > I'm not having any of these problems with a -current from Oct 12th > > on both SMP and UP systems. I'm using KDE and mozilla. > > > > The backtrace with debugging symbols is the dcgui-qt port (net/dc-gui) > which seems to use pthread mutexes quite heavily. It only starts 1 > out of 10 times. I haven't tried this. If it doesn't depend on everything in the world, I'll try it. -- Dan Eischen