On Fri, Jun 24, 2022 at 6:26 AM Jakub Kicinski [off-list ref] wrote:

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What socket type is the ping you have using?

I use SOCK_DGRAM

Strange.

Why is it strange?

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I want to find out, the creation of gre and ip header twice, is it a
feature or a bug?

I can't think why that'd be a feature. Could add this case to selftests
to show how to repro and catch regressions?

I don't really know how to do it, but I'll try
If we just talk about selftests/net, then everything has passed

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I did everything according to the instructions, hope everything is
correct this time.

Nope, still mangled.

Strangely, everything works fine for me