make -C tools/testing/selftests TARGETS="net/forwarding" TEST_PROGS=ip6gree_flat.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: ip6gre_flat.sh
# 22.54 [+22.54] TEST: GRE flat IPv4-in-IPv6                                         [ OK ]
# 25.59 [+3.05] TEST: GRE flat IPv6-in-IPv6                                         [ OK ]

DETECTED CRASH, lowering timeout
# 29.65 [+4.06] TEST: ping GRE IPv6, packet size 1800 after MTU change              [ OK ]
# 33.32 [+3.67] TEST: GRE flat IPv4-in-IPv6 (new remote)                            [ OK ]
# 36.43 [+3.11] TEST: GRE flat IPv6-in-IPv6 (new remote)                            [ OK ]
# 40.61 [+4.18] TEST: GRE flat IPv4-in-IPv6 (old remote)                            [ OK ]
# 43.65 [+3.03] TEST: GRE flat IPv6-in-IPv6 (old remote)                            [ OK ]
ok 1 selftests: net/forwarding: ip6gre_flat.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__->