From owner-freebsd-threads@FreeBSD.ORG  Mon Nov 22 05:55:48 2004
Return-Path: <owner-freebsd-threads@FreeBSD.ORG>
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 DB0D616A4CE
	for <freebsd-threads@freebsd.org>;
	Mon, 22 Nov 2004 05:55:48 +0000 (GMT)
Received: from mail.ntplx.net (mail.ntplx.net [204.213.176.10])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 7D42243D49
	for <freebsd-threads@freebsd.org>;
	Mon, 22 Nov 2004 05:55:48 +0000 (GMT)
	(envelope-from deischen@freebsd.org)
Received: from sea.ntplx.net (sea.ntplx.net [204.213.176.11])
	iAM5tlOM008574;	Mon, 22 Nov 2004 00:55:47 -0500 (EST)
Date: Mon, 22 Nov 2004 00:55:47 -0500 (EST)
From: Daniel Eischen <deischen@freebsd.org>
X-X-Sender: eischen@sea.ntplx.net
To: Steve Kargl <sgk@troutmask.apl.washington.edu>
In-Reply-To: <20041122003244.GA80638@troutmask.apl.washington.edu>
Message-ID: <Pine.GSO.4.43.0411220051360.29589-100000@sea.ntplx.net>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Virus-Scanned: by AMaViS and Clam AntiVirus (mail.ntplx.net)
cc: freebsd-threads@freebsd.org
Subject: Re: firefox stuck in kserel
X-BeenThere: freebsd-threads@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
Reply-To: Daniel Eischen <deischen@freebsd.org>
List-Id: Threading on FreeBSD <freebsd-threads.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-threads>,
	<mailto:freebsd-threads-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-threads>
List-Post: <mailto:freebsd-threads@freebsd.org>
List-Help: <mailto:freebsd-threads-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-threads>,
	<mailto:freebsd-threads-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 22 Nov 2004 05:55:49 -0000

On Sun, 21 Nov 2004, Steve Kargl wrote:

> On Sun, Nov 21, 2004 at 06:37:00PM -0500, Daniel Eischen wrote:
> > > > > >
> > > > > > You can try the patch at:
> > > > > >
> > > > > >   http://people.freebsd.org/~deischen/kse/libpthread.diffs
> > > > > >
> > >
> > > kargl[281] firefox
> > > Fatal error 'Recurse on a private mutex.' at line 988 in file /usr/src/lib/libpthread/thread/thr_mutex.c (errno = 0)
> > > Abort trap (core dumped)
> >
> > What page?  I was running at firefox at work with this patch.
> > The recurse shouldn't happen.  Are you still using plugins?
> >
>
> One more tidbit.  I re-installed your patch and deleted
> linuxpluginwrapper and linux-flashplugin6.  The above
> patch works fine.  Of course, any web page that use flash 6
> becomes somewhat useless.

I don't think it's anything libpthread is doing.

> I also rebuilt libpthread with debugging option -g.  The
> trace shows
>
> (gdb) bt
> #0  0x48a77a2b in kse_thr_interrupt () at kse_thr_interrupt.S:2
> #1  0x48a65d1e in sig_daemon (arg=0x0)
>     at /usr/src/lib/libpthread/thread/thr_sig.c:214
> #2  0x48a6fae7 in kse_sched_single (kmbx=0x17f)
>     at /usr/src/lib/libpthread/thread/thr_kern.c:880

Something is hosed because the mailbox in kse_sched_single() is
garbage.

> #3  0x00000000 in ?? ()
> Current language:  auto; currently asm
> (gdb) quit
>
> This doesn't make any sense to me, so maybe gdb is having
> trouble tracing the core dump.

I don't know.  The backtrace looks OK 'cause kse_sched_single()
is the upcall entry point, but the KSE mailbox (kmbx) is not
correct -- it should be a pointer and looks more like what %gs
would be.

-- 
DE