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
# 17.58 [+17.58] TEST: GRE flat IPv4-in-IPv6                                         [ OK ]
# 19.82 [+2.25] TEST: GRE flat IPv6-in-IPv6                                         [ OK ]
# 22.74 [+2.92] TEST: ping GRE IPv6, packet size 1800 after MTU change              [ OK ]
# 25.40 [+2.66] TEST: GRE flat IPv4-in-IPv6 (new remote)                            [ OK ]
# 27.55 [+2.16] TEST: GRE flat IPv6-in-IPv6 (new remote)                            [ OK ]
# 30.56 [+3.01] TEST: GRE flat IPv4-in-IPv6 (old remote)                            [ OK ]
# 32.75 [+2.19] TEST: GRE flat IPv6-in-IPv6 (old remote)                            [ OK ]

DETECTED CRASH, lowering timeout
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__->