linux-kernel - Re: Oops with PREEMPT-RT on 2.6.25.4

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Message-ID: <4831ECF0.5090101@freescale.com>
Date:	Mon, 19 May 2008 16:11:12 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Rune Torgersen <runet@...ovsys.com>
CC:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org
Subject: Re: Oops with PREEMPT-RT on 2.6.25.4

Rune Torgersen wrote:
> Scott Wood wrote:
>> You're recursively entering lock_timer_base, which does a
>> spin_lock_irqsave().  Either interrupts are enabled when they should
>> not be, or an interrupt was supposed to be threaded that isn't.
> 
> Sort of figured. How do I figure out which one, and how to fix it?

Almost certainly the latter.  Is the disk interrupt shared with any 
other interrupts, that are marked IRQF_NODELAY?  The -rt patch doesn't 
seem to handle mixing the two well.

Oh, and just to be sure: you do have CONFIG_PREEMPT_RT turned on, and 
not just CONFIG_PREEMPT, right?  The non-preempt-rt versions in the -rt 
patch don't look like they disable interrupts, though I may just be 
getting lost in a sea of underscores and ifdefs.

-Scott

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