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Date: Sat, 24 Jan 2009 16:34:52 +0000
From: "Bruce M. Simpson" <bms@FreeBSD.org>
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To: Andriy Gapon <avg@icyb.net.ua>
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Cc: freebsd-stable@FreeBSD.ORG
Subject: Re: panic in destroy_devl: null si_devsw
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Andriy Gapon wrote:
> ...
> About the code that called destroy_dev(): it created cdev probably too
> early, failed to allocate some system resource, so it went to destroy
> the newly created cdev. Non-null cdevsw was definitely provided to make_dev.
>
>   

I saw a very, very similar panic with 7.1 sources and jhb's ppc locking 
patch yesterday.

Could this be related to a difference in unit numbers between 8.x and 8.x?