linux-kernel - Re: 2.6.24-rc7-rt2

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Message-Id: <200801151810.28279.m.kozlowski@tuxland.pl>
Date:	Tue, 15 Jan 2008 18:10:27 +0100
From:	Mariusz Kozlowski <m.kozlowski@...land.pl>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.24-rc7-rt2

> > > We are pleased to announce the 2.6.24-rc7-rt2 tree, which can be
> > > downloaded from the location:
> > >
> > >   http://rt.et.redhat.com/download/
> >
> > Compiles fine but I run into another problem. On startup kernel oopses
> > early and this 'oops' loops over and over again on the screen until you
> > shut down the box. So I can't (easily) capture the output. I tried different
> > boot_delay values but it seems that it doesn't work as intended. Seems that
> > it delays only the first printk from oops, then the rest loops over the screen
> > without delay - again it becomes unreadable. I used my usual config with a bunch
> > of debug options enabled so that maybe is not real rt system case. Also tried to
> > bisect it with quilt but that is hard. Lots of patches depends on another patches
> > so bisection brakes things. I'll look into this tommorow and reply if I get
> > anything substantial.
> >
> > I attached my config in case anybody wants to try to reproduce that.
> >
> 
> Turn off LOCKDEP and see if you still have the same problems. This might
> be fixed with Daniel's patch.

Ok. It works.

I found this in dmesg:

BUG: swapper:0 task might have lost a preemption check!
Pid: 0, comm: swapper Not tainted 2.6.24-rc7-rt2 #3
 [<c010386b>] show_trace_log_lvl+0x1d/0x3b
 [<c01042f3>] show_trace+0x12/0x14
 [<c0104a2f>] dump_stack+0x6a/0x70
 [<c0115419>] preempt_enable_no_resched+0x5c/0x5e
 [<c0100e35>] cpu_idle+0x6d/0x82
 [<c0323b6e>] rest_init+0x66/0x68
 [<c043aba6>] start_kernel+0x20c/0x276
 [<00000000>] 0x0
 =======================
---------------------------
| preempt count: 00000000 ]
| 0-level deep critical section nesting:
----------------------------------------

Box runs fine though.

Regards,

	Mariusz
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