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Subject: Re: 2.6.17-rt8 crash amd64
From: Daniel Walker <dwalker@mvista.com>
To: Bill Huey <billh@gnuppy.monkey.org>
Cc: Steven Rostedt <rostedt@goodmis.org>, Ingo Molnar <mingo@elte.hu>,
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Date: Wed, 02 Aug 2006 10:16:44 -0700
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On Wed, 2006-08-02 at 00:13 -0700, Bill Huey wrote:

>   [ 3254.657547] BUG: scheduling while atomic: mv/0x00000001/5222
>   [ 3254.663380]
>   [ 3254.663381] Call Trace:
>   [ 3254.667255]        <ffffffff8025ef25>{__schedule+155}
>   [ 3254.672491]
>   <ffffffff802616cb>{_raw_spin_unlock_irqrestore+81}

>   [ 3254.836278]        <ffffffff8025df02>{ia32_sysret+0}
>   [ 3254.841606] ---------------------------
>   [ 3254.845554] | preempt count: 00000001 ]
>   [ 3254.849503] | 1-level deep critical section nesting:
>   [ 3254.854614] ----------------------------------------
>   [ 3254.859725] .. [<ffffffff8025ef3d>] .... __schedule+0xb3/0xb2a
>   [ 3254.865743] .....[<ffffffff8025fbab>] ..   ( <=
>   preempt_schedule+0x55/0x8f)


_raw_spin_unlock_irqrestore() calls preempt_schedule() which calls
__schedule() , maybe (should be impossible though)? 

Are you using a 32-bit userspace and a 64-bit kernel ?

Daniel

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