Hi All.
The patch 5c069b6dedef "selftests: Move test output to diagnostic lines" from Apr 24, 2019,
leads to `make run_tests -C bpf` hanging forever.
Bpf includes many subtest, when cmd `make run_tests -C bpf` runs to test_lwt_seg6local.sh, task will hang and runner.sh never run next task. I checked ps aux, prefix.pl will never exit.
```
91058 [ 811.451584] # [25] VAR __license type_id=24 linkage=1 91059 [ 811.451586]- 91060 [ 811.455365] # [26] DATASEC license size=0 vlen=1 size == 0 91061 [ 811.455367]- 91062 [ 811.457424] #- 91063 [ 811.457425]- 91064 [ 811.460912] # selftests: test_lwt_seg6local [PASS] 91065 [ 811.460914]- 91066 [ 3620.461986] Thu Oct 17 14:54:05 CST 2019 detected soft_timeout
```
Ignore test_lwt_seg6local and run `make run_tests -C bpf` again, task will hang on test_tc_tunnel.sh.
Kushwaha also meet this issue, `make run_tests -C bpf` hang on test_lwt_ip_encap.sh (This test failed on my localhost).