netd_integration_test - assertBpfContext - make test failure easier to debug

Bug: 258879079
Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I6815166d605ef69d80106efebd454a9d7c935e3b
diff --git a/tests/netd_test.cpp b/tests/netd_test.cpp
index 169fa2b..0fb1a51 100644
--- a/tests/netd_test.cpp
+++ b/tests/netd_test.cpp
@@ -78,7 +78,9 @@
                                                   target, label, target);
 
     // NOLINTNEXTLINE(cert-env33-c)
-    ASSERT_EQ(W_EXITCODE(0, 0), system(cmd.c_str())) << cmd << " - did not return success(0)";
+    ASSERT_EQ(W_EXITCODE(0, 0), system(cmd.c_str())) << cmd << " - did not return success(0)"
+        " - is kernel missing https://android-review.googlesource.com/c/kernel/common/+/1831252"
+        " 'UPSTREAM: security: selinux: allow per-file labeling for bpffs' ?";
 }
 
 // This test will fail if kernel is missing: