Re: Oops with PREEMPT-RT on

From: Scott Wood
Date: Mon May 19 2008 - 17:10:44 EST

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.


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