[Bug 221122] Attatching vxlan interfaces to a bridge stops all traffic on it

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221122

            Bug ID: 221122
           Summary: Attatching vxlan interfaces to a bridge stops all
                    traffic on it
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: heinz at project-fifo.net

Running the following test case leads to the bridge0 to become unresponsive
(this includes other interfraces on the bridge):

while true
do
   PAIR=`ifconfig epair create | sed 's/a\$//'`
   ifconfig bridge0 addm ${PAIR}a
   jail -i -c name=crash persist vnet=new vnet.interface=${PAIR}b
exec.start="/sbin/ifconfig ${PAIR}b name net0p"
   jail -r crash
   ifconfig ${PAIR}a destroy
done


The test setup:

                               ┌───────────────────────────────────┐
                               │             BSD Box               │
                  ┌──────┐     │     ┌──────────────┬─────────────┐│
┌───────────┐     │      │     │     │      em0     │             ││
│ ping host │────▶│switch│─────┼───▶│ 192.168.1.22 │             ││
└───────────┘     │      │     │     └──────────────┤             ││
                  └──────┘     │                    │             ││
                               │                    │   bridge0   ││
                               │                    │             ││
                               │                    │             ││
                               │                    │             ││
                               │                    │             ││
                               │                    └─────────────┘│
                               └───────────────────────────────────┘

The kernel is the 11.1-RELEASE kernel with the following patch applied:
https://reviews.freebsd.org/D11782

The compiling config is:

include GENERIC
ident FIFOKERNEL

nooptions       SCTP   # Stream Control Transmission Protocol
options         VIMAGE # VNET/Vimage support
options         RACCT  # Resource containers
options         RCTL   # same as above


The system is a Supermicro X9SCL/X9SCM with an Intel(R) Xeon(R) CPU E3-1220 V2
@ 3.10GHz CPU and an intel 1G network card.

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