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The reference implementation of Dhcp6Dxe in EDK2 has a fatal flaw: the code in EfiDhcp6Stop() will poll the network in a tight loop until either a response is received or a timer tick (at TPL_CALLBACK) occurs. When EfiDhcp6Stop() is called at TPL_CALLBACK or higher, this will result in an endless loop and an apparently frozen system. Since this is the reference implementation of Dhcp6Dxe, it is likely that almost all platforms have the same problem. Fix by vetoing the broken driver. If the upstream driver is ever fixed and a new version number issued, then we could plausibly test against the version number exposed via the driver binding protocol. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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