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Subject: Re: Real-Time Preemption, -RT-2.6.12-final-V0.7.50-24
From: Daniel Walker <dwalker@mvista.com>
Reply-To: dwalker@mvista.com
To: Chuck Harding <charding@llnl.gov>
Cc: Linux Kernel Discussion List <linux-kernel@vger.kernel.org>
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Organization: MontaVista
Date: Mon, 27 Jun 2005 13:09:51 -0700
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On Mon, 2005-06-27 at 12:01 -0700, Chuck Harding wrote:
> What can be causing the following message to appear in dmesg and
> how can I fix it?
> 
> BUG: scheduling with irqs disabled: kapmd/0x00000000/46
> caller is schedule_timeout+0x51/0x9e
>   [<c02b3bc9>] schedule+0x96/0xf6 (8)
>   [<c02b43f7>] schedule_timeout+0x51/0x9e (28)
>   [<c01222ed>] process_timeout+0x0/0x5 (32)
>   [<c0112063>] apm_mainloop+0x7a/0x96 (24)
>   [<c0115e45>] default_wake_function+0x0/0x16 (12)
>   [<c0115e45>] default_wake_function+0x0/0x16 (32)
>   [<c0111485>] apm_driver_version+0x1c/0x38 (16)
>   [<c01126f7>] apm+0x0/0x289 (8)
>   [<c01127a6>] apm+0xaf/0x289 (8)
>   [<c010133c>] kernel_thread_helper+0x0/0xb (20)
>   [<c0101341>] kernel_thread_helper+0x5/0xb (4)
> 
> This was also present in earlier final-V0.7.50 version I've tried
> (since -00) I don't get hangs but that doesn't look like it should
> be happening. Thanks.

If you have PREEMPT_RT enabled, it looks like interrupts are hard
disabled then there is a schedule_timeout() requested. You could try
turning off power management and see if you still have problems.

Daniel