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Subject: Re: 2.6.15-rc5-rt4: BUG: swapper:0 task might have lost
	a	preemption check!
From: Steven Rostedt <rostedt@goodmis.org>
To: "K.R. Foley" <kr@cybsft.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
       Lee Revell <rlrevell@joe-job.com>, John Rigg <lk@sound-man.co.uk>
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On Fri, 2005-12-23 at 10:29 -0600, K.R. Foley wrote:

> 
> OK. The BUG still exists (output below) but it does boot now with the
> above patch applied (THANKS Steven!), which would seem to imply the two
> weren't related. ARGH! :)
> 
> Dec 23 10:16:27 porky kernel: Event source lapic installed with caps set: 06
> Dec 23 10:16:27 porky kernel: BUG: swapper:0 task might have lost a
> preemption check!
> Dec 23 10:16:27 porky kernel: Brought up 2 CPUs
> Dec 23 10:16:27 porky kernel: checking if image is initramfs... it is
> Dec 23 10:16:27 porky kernel:  [<c010424e>] dump_stack+0x1e/0x20 (20)
> Dec 23 10:16:27 porky kernel:  [<c011c9cf>]
> preempt_enable_no_resched+0x5f/0x70 (20)
> Dec 23 10:16:27 porky kernel:  [<c0100ff2>] cpu_idle+0xb2/0x100 (40)
> Dec 23 10:16:27 porky kernel:  [<c0111446>]
> start_secondary+0x296/0x340<6>Freeing initrd memory: 452k freed
> 

Yeah, I've seen the "might have lost a preemption check" too. But since
this didn't seem to cause a problem booting my kernel (yet), it went to
the end of the todo list.

Does this cause any other problems?

-- Steve


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