kselftest/arm64: Log unexpected asynchronous MTE faults

Help people figure out problems by printing a diagnostic when we get an
unexpected asynchronous fault.
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20220419103243.24774-3-broonie@kernel.orgSigned-off-by: Catalin Marinas <catalin.marinas@arm.com>

tools/testing/selftests/arm64/mte/mte_common_util.c

@@ -37,6 +37,10 @@ void mte_default_handler(int signum, siginfo_t *si, void *uc)
 		if (si->si_code == SEGV_MTEAERR) {
 			if (cur_mte_cxt.trig_si_code == si->si_code)
 				cur_mte_cxt.fault_valid = true;
+			else
+				ksft_print_msg("Got unexpected SEGV_MTEAERR at pc=$lx, fault addr=%lx\n",
+					       ((ucontext_t *)uc)->uc_mcontext.pc,
+					       addr);
 			return;
 		}
 		/* Compare the context for precise error */