linux-kernel - Re: [ANNOUNCE] 3.0-rt6 : BUG at kernel/trmutex.c:724!

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Message-ID: <1312475829.16729.45.camel@twins>
Date:	Thu, 04 Aug 2011 18:37:09 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tim Sander <tim.sander@....com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [ANNOUNCE] 3.0-rt6 : BUG at kernel/trmutex.c:724!

On Thu, 2011-08-04 at 18:34 +0200, Tim Sander wrote:
> I was really happy to find 6 preempt rt releases for the 3.0 kernel after holliday :-).
> 
> So i went for a testdrive and found an error: The error occurs in a non released non 
> mainline kernel and is available from me upon request. It has been working on 
> (2.6.39,3.0) but is not working on 3.0-rt6. It fails in an interrupt which calls: 
> 
> wake_up_interruptible(&hbm_device.wait);
> 
> The waitque has been initialized with:
> init_waitqueue_head(&hbm_device.wait);
> before interrupts where enabled. So i don't think its a race. 

looks like it tries to use waitqueues from hardirq context, that's a
no-no for -rt. That interrupt should be a threaded interrupt.
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