make -C tools/testing/selftests TARGETS="net/forwarding" TEST_PROGS=min_maax_mtu.sh TEST_GEN_PROGS="" run_tests
make: Entering directory '/home/virtme/testing-4/tools/testing/selftests'
make[1]: Entering directory '/home/virtme/testing-4/tools/testing/selftests/net/forwarding'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/home/virtme/testing-4/tools/testing/selftests/net/forwarding'
make[1]: Entering directory '/home/virtme/testing-4/tools/testing/selftests/net/forwarding'
TAP version 13
1..1
# overriding timeout to 21600
# selftests: net/forwarding: min_max_mtu.sh
# 11.17 [+11.17] TEST: ping                                                          [ OK ]
# 12.58 [+1.41] TEST: ping6                                                         [ OK ]

DETECTED CRASH, lowering timeout
# 14.84 [+2.26] TEST: Test maximum MTU configuration                                [ OK ]
# 22.63 [+7.79] TEST: Test traffic, packet size is maximum MTU                      [ OK ]
# 25.00 [+2.36] TEST: Test minimum MTU configuration                                [ OK ]
# 28.58 [+3.58] TEST: Test traffic, packet size is minimum MTU                      [ OK ]
ok 1 selftests: net/forwarding: min_max_mtu.sh
make[1]: Leaving directory '/home/virtme/testing-4/tools/testing/selftests/net/forwarding'
make: Leaving directory '/home/virtme/testing-4/tools/testing/selftests'
xx__-> echo $?
0
xx__->