On Mon, 21 Dec 2020 19:46:23 +0100 Eric Dumazet wrote: > So maybe the issue is coming from traffic coming from a VM through a > tun device or something, > and our handling of GSO_ROBUST / DODGY never cared about setting > SKB_GSO_TCPV4 or SKB_GSO_TCPV6 if not already given by user space ? > > Or a plain bug somewhere, possibly overwriting gso_type with 0 or garbage... Hm, the Arch Linux forum thread linked from the kernel bugzilla has the user complaining about NFS performance.