Re: [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm2-V0.7.7

[Michael J. Cohen]

On Thu, 2004-11-04 at 07:59 -0500, Michael J. Cohen wrote:
> On Thu, 2004-11-04 at 12:45 +0100, Ingo Molnar wrote:
> > * Michael J. Cohen <mjc@xxxxxxx> wrote:
> > 
> > > Turned off the debugging stuff to fix this one :/
> > > 
> > > might_sleep issue at swap_on and firefox causes oopsen.
> > > 
> > > dmesg is 120k+ so here:
> > > 
> > > http://325i.org/software/2.6.10-rc1-mm2-RT-V0.7.8.dmesg
> > 
> > does the patch below fix the fbcon problem? (if any new oops happens or
> > old one triggers again then please re-post the syslog or serial console
> > capture)
> > 
> > 	Ingo
> > 
> > --- linux/drivers/video/console/fbcon.c.orig
> > +++ linux/drivers/video/console/fbcon.c
> > @@ -1051,7 +1051,14 @@ static void fbcon_cursor(struct vc_data 
> >  	struct display *p = &fb_display[vc->vc_num];
> >  	int y = real_y(p, vc->vc_y);
> >   	int c = scr_readw((u16 *) vc->vc_pos);
> > +#ifdef CONFIG_PREEMPT_REALTIME
> > +	unsigned long flags;
> > +#endif
> >  
> > +#ifdef CONFIG_PREEMPT_REALTIME
> > +	local_save_flags(flags);
> > +	local_irq_enable();
> > +#endif
> >  	ops->cursor_flash = 1;
> >  	if (mode & CM_SOFTBACK) {
> >  		mode &= ~CM_SOFTBACK;
> > @@ -1069,6 +1076,9 @@ static void fbcon_cursor(struct vc_data 
> >  	ops->cursor(vc, info, p, mode, get_color(vc, info, c, 1),
> >  		    get_color(vc, info, c, 0));
> >  	vbl_cursor_cnt = CURSOR_DRAW_DELAY;
> > +#ifdef CONFIG_PREEMPT_REALTIME
> > +	local_irq_restore(flags);
> > +#endif
> >  }
> >  
> >  static int scrollback_phys_max = 0;
> 
> Works fine so far. still have to deal with e1000 though...
> 
> ------

I just managed to hardlock it reproducibly with no useful output on
serial.

light network activity, bonnie++, and using xmms w/ jack.  Locks up
within a few seconds of starting bonnie++

tried my hardest (sysreq, even kgdb) and I couldn't get it to let me do
anything :(

------
Michael Cohen

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