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Subject: Re: 2.6.13-rc6-rt6
From: Steven Rostedt <rostedt@goodmis.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org
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Organization: Kihon Technologies
Date: Wed, 17 Aug 2005 01:46:20 -0400
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On Wed, 2005-08-17 at 00:20 -0400, Steven Rostedt wrote:
> Ingo,
> 
> FYI, I ran this on my laptop (Pentium4 HT) and it locked up shortly
> after it started INIT.  I rebooted, and now it's up and running 
> with no problems!?!  I'll reboot it a few more times to see if it will
> lock up again.

With a small change it locks up all the time :-)

> 
> Unfortunately, my laptop doesn't have any serial so I don't have much to
> debug with it.  I'll set up netconsole, but this is not as reliable
> under RT, or was this fixed. I remember before that it could call things
> that would schedule and had some hooks to keep interrupts on.
> 
> Oh, I also did get the message when it started:
> 
> WARNING: kstopmachine/859 changed soft IRQ-flags.
>  [<c0149e0b>] stop_machine+0x11b/0x160 (8)
>  [<c0149e7e>] do_stop+0xe/0x70 (32)
>  [<c0139c5a>] kthread+0xba/0xc0 (16)
>  [<c0139ba0>] kthread+0x0/0xc0 (28)
>  [<c0101385>] kernel_thread_helper+0x5/0x10 (16)

I replaced this with raw_local_irq_disable and it really locks up
everytime now.  I need to look into how this is best done.

> The kernel I used was rt6 with my latest patch to the
> raw_local_save_flags.

I just got the NMI working, but since it is now 1:44am my time, I'm
going to bed.  I'll run it again tomorrow and hopefully the NMI will
show where and why it's locking up.

-- Steve