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Date: Wed, 30 Sep 2009 10:22:11 +0200
From: Beat Gaetzi <beat@FreeBSD.org>
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To: Fredrik Lindberg <fli@shapeshifter.se>
References: <alpine.BSF.2.00.0909221337580.13791@thor.farley.org>	<4AC120F6.7090701@shapeshifter.se>	<alpine.BSF.2.00.0909282037290.1735@thor.farley.org>
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Cc: freebsd-emulation@FreeBSD.org
Subject: Re: Panic with vboxnet drivers
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Hi Fredrik,

Fredrik Lindberg wrote:
> Sean C. Farley wrote:
>>>> 2. The next three logs are LOR's (sleepable after non-sleepable)
>>>>    concerning VirtualBox's "IPRT Fast Mutex Semaphore" which is an
>>>>    sx.  I am not sure I am reading the backtrace correctly.  It looks
>>>>    like the call to RTSemFastMutexRequest(), which calls sx_xlock(),
>>>>    is the effect.  I just do not know where the cause, i.e.,
>>>>    RTSemFastMutexRequest(), is being called.
>>>
>>> Yeah, this was a real one. The call to RTSemFastMutexRequest is
>>> inside the virtual ethernet switch.  I've attached a patch that
>>> defers processing to avoid the sleepable after non-sleepable case. 
>>> Hopefully this fixes the panic you're seeing as well.
>>
>> Thank you!  :)  This does fix the panic.
>>
> 
> Great, I'll submit it upstreams as soon as possible.

Thanks for this patch. We already added the patch to the port. To fix a
build failure on FreeBSD 7/amd64 we had to increase abPadding[] size in
patch-src-VBox-HostDrivers-VBoxNetFlt-VBoxNetFltInternal.h:

http://tmp.chruetertee.ch/virtualbox-amd64-build-fix.patch

Beat