Comment 1 for bug 1933969

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Guilherme G. Piccoli (gpiccoli) wrote : Re: test_pmtu_vti4_link_add_mtu() test from net/pmtu.sh in ubuntu_kernel_selftests cannot finish properly on Groovy

Thanks for the report!! We may be missing this patch:

https://git.kernel.org/linus/0d7a7b2014b1 ("ipv6: remove extra dev_hold() for fallback tunnels")

It has a fixes tag for upstream 40cb881b5aaa, which was merged in our newer 5.8 kernels - can you test with the fix @cypressyew and let us know?
Thanks!