Hello folks, I'm experiencing a weird issue. I'm running a current master with linux-cp plugin enabled. I create a loopback interface, set it as BVI for a bridge, and create a lcp for the loop. Almost everywhere it's working just fine. Usually, the trace looks like this:
virtio-input -> ethernet-input -> ip4-input -> linux-cp-xc-ip4 -> loop20-output -> l2-input -> etc But on 2 machines I observe a crash almost immediately as some traffic comes from the tap interface (which is lcp interface for the loop). It happens in the "l2-input" node. But the tap interface isn't a part of any bridge (and obviously it doesn't have any l2 config, and that's why vpp crashes). I even enabled VLIB_BUFFER_TRACE_TRAJECTORY to check how the trace looks like. I can see that the packet goes directly from "ethernet-input" to "l2-input" (which obviously shouldn't happen). I double-checked the sources of ethernet-input and the only reason could be if in ethernet_main.main_intfs[sw_if_index] there's a flag SUBINT_CONFIG_L2 for an untagged subinterface. I checked that in gdb and I don't have such a flag for my tap interface. Since I run out of ideas on what to check I'm asking for the help of the community. So, any ideas/inputs are much appreciated. -- Best regards Stanislav Zaikin
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