Using tc to mirror outbound traffic from a given physical interface to a tunnel interface which traverses the original physical interface causes a deadlock and soft lockup warnings

Solution Verified - Updated -


  • Using tc to mirror outbound traffic can cause a deadlock (soft lockup) if the traffic is mirrored onto a GRE tunnel whose traffic is routed over the same underlying interface as the original traffic.
  • Can presumably affect other types of tunnels.


  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • IP Tunnels

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