Date: Sun, 19 Oct 2003 17:50:54 -0400 (EDT) From: Daniel Eischen <eischen@vigrid.com> To: Morten Rodal <morten@rodal.no> Cc: threads@freebsd.org Subject: Re: libkse and bus error Message-ID: <Pine.GSO.4.10.10310191747540.26554-100000@pcnet5.pcnet.com> In-Reply-To: <20031019183129.GA94145@slurp.rodal.no>
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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
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