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Re: iwlagn: crash when unloading the module

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On Tue, 2011-05-03 at 07:42 -0700, wwguy wrote:

> > http://www.adurom.com/~kvalo/tmp/iwlagn/rmmod-iommu-crash/1.png
> > http://www.adurom.com/~kvalo/tmp/iwlagn/rmmod-iommu-crash/2.png
> > 
> > This is a new laptop and most likely I haven't removed iwlagn module
> > before. So this shouldn't be a regression.
> > 
> 
> it is new to me as well, I never see that happen on my system. Could you
> share some more information with me? such as laptop model, kernel
> version, 32 or 64 bits.
> 
> Also is there any activity while you unload the iwlagn, is it in connect
> state or not? 

Dave looked at this and it turned out to most likely be a bug in the
intel-iommu code. A tentative patch to fix it from him is here:
http://david.woodhou.se/double-unmap-check.patch

johannes

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