linux-kernel - Re: Threaded interrupt handlers broken?

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Message-Id: <200909042055.55385.mb@bu3sch.de>
Date:	Fri, 4 Sep 2009 20:55:52 +0200
From:	Michael Buesch <mb@...sch.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Threaded interrupt handlers broken?

On Monday 17 August 2009 14:30:31 Michael Buesch wrote:
> Also works. Thanks.
> 
> Tested-by: Michael Buesch <mb@...sch.de>

Hm, I've got a strange problem here related to threaded IRQs and rmmod.

If I do this sequence, it crashes the machine:
request_threaded_irq();
free_irq();
rmmod module
modprobe module
request_threaded_irq();
*boom*

Here are some oops messages. These are almost always different, so I
guess it crashes in IRQ context at random places when the IRQ triggers.
http://bu3sch.de/misc/irq_crash1.JPG
http://bu3sch.de/misc/irq_crash2.JPG

It seems to be a NULL pointer dereference somewhere, but I can't locate it.
Note that it does not happen, if I omit the rmmod.

-- 
Greetings, Michael.
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