https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit?id=927e3cfb52b58fbdf217d84204d653db101c137a This commit changed how percentages in to netem were parsed. A percentage of 0.0% now raises an error. This may make sense in the context of the commit but it also applies to loss and duplicate. In that context 0.0% is a valid entry and one that has worked before. This therefore breaks userspace applications such as the CORE Emulator. As an example this command gives an error >"tc qdisc replace dev veth2.0.34 root handle 10: netem delay 120000us 0us 25% >loss 0.0% duplicate 0.0%" when it should be valid and used to work prior to the referenced commit.
Patch submitted for next version: https://patchwork.ozlabs.org/patch/915857/