Re: Kernel 3.3.0 autofs v5 packet size change

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On Mon, 2012-02-27 at 09:46 +0800, Ian Kent wrote:
> Hi all,
> 
> Just a heads up for everyone regarding a recent kernel change.
> 
> The description from the autofs user space patch describes the issue:
> 
> "Kernel 3.3.0 has a patch to allow for the original missdesign of
> the autofs v5 kernel packet.
> 
> The problem is that while all the structure fields are alligned
> correctly structure allignment on x86-64 causes the packet size
> to be 4 bytes larger than on x86. So when running an x86 binary
> on an x86-64 install the packet size did not match causing user
> space pipe reads to hang."
> 
> If you are an upstream package maintainer and your distro is likley to
> migrate to kernel 3.3.0 or later or you are planning using kernel 3.3.0
> or later then you will need these patches:
> http://www.kernel.org/pub/linux/daemons/autofs/v5/patches-5.0.7/autofs-5.0.6-add-kernel-verion-check-function.patch
> http://www.kernel.org/pub/linux/daemons/autofs/v5/patches-5.0.7/autofs-5.0.6-allow-for-kernel-packet-size-change.patch

and, of course, a fix for mistakes I made:
http://www.kernel.org/pub/linux/daemons/autofs/v5/patches-5.0.7/autofs-5.0.6-fix-allow-for-kernel-packet-size-change.patch

> 
> If you use rc kernels and you plan on using 3.3.0-rc5 you will also need
> commit 3c761ea05a8900a907f32b628611873f6bef24b2 from the linus kernel
> tree to fix a compile mistake.
> 
> Sorry for the inconvenience.
> Ian


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