No such log is necessary. You simply forgot to backport two critical
patches.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1685416
Title:
Virtio Fixes Not Backported --> Google Cloud Platform Drops Packets
Status in linux package in Ubuntu:
Confirmed
Bug description:
The HWE kernel, and possibly others too, backport some virtio
improvements related to setting VIRTIO_NET_HDR_F_DATA_VALID on
received packets so that the CPU doesn't have to checksum packets that
have already been verified by hardware. In the initial implementation
of this, the kernel erroneously set this flag too for transmitted
packets, which is explicitly forbidden by the virtio spec. It was
rectified in these two commits:
501db511397fd6efff3aa5b4e8de415b55559550
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=501db511397fd6efff3aa5b4e8de415b55559550
6391a4481ba0796805d6581e42f9f0418c099e34
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6391a4481ba0796805d6581e42f9f0418c099e34
Both of these must be backported into your HWE kernel and perhaps
other Ubuntu kernels too. (They were both backported into the
kernel.org stable kernels.) While mostly nobody cares about this
"correctness" issue, it turns out that Google Cloud Platform -- which
uses the HWE kernel by default -- does care and will silently and
mysteriously drop packets. This leads to packets being dropped
entirely when being forwarded between various types of network
drivers.
This issue must be fixed in order to use Ubuntu on Google Cloud
Platform.
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