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List:       freebsd-hackers
Subject:    RE: panic in device driver strategy function: bp->b_dev==NULL
From:       "Norbert Koch" <NKoch () demig ! de>
Date:       2005-05-27 13:34:15
Message-ID: 000301c562c0$c6825400$4801a8c0 () ws-ew-3 ! W2KDEMIG
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> Hello,
> 
> I have written a small device driver for a static ram
> based disk. The code is - more or less - derived from
> Poul Henning Kamp's md device.
> It is written for FreeBSD 4.X.
> 
> This device is kld-loaded and runs without any problems
> with my 'standard' kernel configuration.
> 
> As soon as I boot a kernel with some debug settings the
> driver crashes due to a failed assertion in my strategy
> routine.
> 

Hello again,

I played around with configuration switches and found,
that without "option DEBUG_LOCKS" all is ok.
Any idea?

Norbert Koch

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