Running this test on jammy 5.15, it passes if the vrf module is missing,
the ping will come back with the expected response of Packet too big.
With the vrf module loaded, we won't get the message back. Looking at
the strace of the command working vs failing, this is a difference
spotted:

vrf loaded: 
recvmsg(3, {msg_namelen=128}, 0)        = -1 EAGAIN (Resource temporarily 
unavailable)
recvmsg(3, {msg_namelen=128}, 0)        = -1 EINTR (Interrupted system call)
--- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---

vrf missing: 
recvmsg(3, {msg_namelen=128}, 0)        = -1 EMSGSIZE (Message too long)

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https://bugs.launchpad.net/bugs/1928890

Title:
  vrf_route_leaking.sh in net from ubuntu_kernel_selftests linux ADT
  test failure with linux/5.11.0-18.19 (Ping received ICMP Packet too
  big)

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