From: Joe Stringer <joe@wand.net.nz>
Date: Wed, 14 Feb 2018 13:50:34 -0800
Subject: selftests/bpf: Print unexpected output on fail
Patch-mainline: v4.17-rc1
Git-commit: 95f87a9706d0a55ff02a652bc8f1b3f7d51bf5eb
References: bsc#1109837

This makes it easier to debug off-hand when the error message isn't
exactly as expected.

Signed-off-by: Joe Stringer <joe@wand.net.nz>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 tools/testing/selftests/bpf/test_verifier.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -11375,7 +11375,8 @@ static void do_test_single(struct bpf_te
 			goto fail_log;
 		}
 		if (!strstr(bpf_vlog, expected_err) && !reject_from_alignment) {
-			printf("FAIL\nUnexpected error message!\n");
+			printf("FAIL\nUnexpected error message!\n\tEXP: %s\n\tRES: %s\n",
+			      expected_err, bpf_vlog);
 			goto fail_log;
 		}
 	}