Re: 2.4.22-pre3 and reiserfs boot problem

[Chris Mason <mason@suse.com>]

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On Thu, 2003-07-10 at 14:01, Marcelo Tosatti wrote:
> On Thu, 10 Jul 2003, Stephan von Krawczynski wrote:
> 
> > On Thu, 10 Jul 2003 20:20:02 +0400
> > "Peter Lojkin" <ia6432@inbox.ru> wrote:
> >
> > > Hello,
> > >
> > > here is exact patch i've used. i made it by cutting pre2-pre3 diff,
> > > so apply it o top of 2.4.22-pre3 with -R option to patch...
> >
> > Hello Peter
> > Hello Marcelo
> >
> > I can confirm that pre3 works when reversing the attached patch. Thanks very
> > much, Peter.
> 
> Fine Stephan. Now can youplease get us the task backtraces from sysrq when
> the hang happens?
> 
> Andrea, Chris, any idea of why this is happening?

My first guess is that blk_oversized_queue is false but there aren't any
requests left.  That will pretty much spin in __get_request_wait with
irqs off, which sounds similar to what he's hitting.

I think we need this hunk even if it doesn't fix his problem.

Stephan, if this patch doesn't help, could you please boot with
nmi_watchdog=1?  An earlier email said sysrq wasn't working, so we'll
probably need the nmi_watchdog to get a backtrace.

-chris


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===== drivers/block/ll_rw_blk.c 1.46 vs edited =====
--- 1.46/drivers/block/ll_rw_blk.c	Fri Jul  4 13:35:08 2003
+++ edited/drivers/block/ll_rw_blk.c	Fri Jul 11 08:30:54 2003
@@ -618,7 +618,7 @@
 	do {
 		set_current_state(TASK_UNINTERRUPTIBLE);
 		spin_lock_irq(&io_request_lock);
-		if (blk_oversized_queue(q)) {
+		if (blk_oversized_queue(q) || q->rq.count == 0) {
 			__generic_unplug_device(q);
 			spin_unlock_irq(&io_request_lock);
 			schedule();