linux-kernel - Re: [patch] Re: [regression bisect -next] BUG: using smp_processor_id() in preemptible [00000000] code: rmmod

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Message-Id: <1256807967.7158.58.camel@marge.simson.net>
Date:	Thu, 29 Oct 2009 10:19:27 +0100
From:	Mike Galbraith <efault@....de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org,
	hpa@...or.com, a.p.zijlstra@...llo.nl, tglx@...utronix.de
Subject: Re: [patch] Re: [regression bisect -next] BUG: using
 smp_processor_id() in preemptible [00000000] code: rmmod

On Thu, 2009-10-29 at 10:14 +0100, Ingo Molnar wrote:

> hm, the problem is kthread_bind(). It is rummaging around in scheduler 
> internals without holding the runqueue lock - and this now got exposed. 
> Even though it is operating on (supposedly ...) inactive tasks, the guts 
> of that function should be moved into sched.c and it should be fixed to 
> have proper locking.

Yeah, I was thinking that nobody should ever be able to hit that without
it being a bug.. but wimped out.

	-Mike

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