[tip: core/rcu] rcutorture: Handle non-statistic bang-string error messages

[tip-bot2 for Paul E. McKenney]

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     59359e4f2a0906920389ec1e33296ac9a19178ba
Gitweb:        https://git.kernel.org/tip/59359e4f2a0906920389ec1e33296ac9a19178ba
Author:        Paul E. McKenney <paulmck@xxxxxxxxxx>
AuthorDate:    Sun, 26 Apr 2020 16:51:56 -07:00
Committer:     Paul E. McKenney <paulmck@xxxxxxxxxx>
CommitterDate: Mon, 29 Jun 2020 12:01:44 -07:00

rcutorture: Handle non-statistic bang-string error messages

The current console parsing assumes that console lines containing "!!!"
are statistics lines from which it can parse the number of rcutorture
too-short grace-period failures.  This prints confusing output for
other problems, including memory exhaustion.  This commit therefore
differentiates between these cases and prints an appropriate error string.

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
 tools/testing/selftests/rcutorture/bin/parse-console.sh | 18 ++++++--
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/rcutorture/bin/parse-console.sh b/tools/testing/selftests/rcutorture/bin/parse-console.sh
index 4bf62d7..1c64ca8 100755
--- a/tools/testing/selftests/rcutorture/bin/parse-console.sh
+++ b/tools/testing/selftests/rcutorture/bin/parse-console.sh
@@ -44,11 +44,23 @@ then
 		tail -1 |
 		awk '
 		{
-			for (i=NF-8;i<=NF;i++)
+			normalexit = 1;
+			for (i=NF-8;i<=NF;i++) {
+				if (i <= 0 || i !~ /^[0-9]*$/) {
+					bangstring = $0;
+					gsub(/^\[[^]]*] /, "", bangstring);
+					print bangstring;
+					normalexit = 0;
+					exit 0;
+				}
 				sum+=$i;
+			}
 		}
-		END { print sum }'`
-		print_bug $title FAILURE, $nerrs instances
+		END {
+			if (normalexit)
+				print sum " instances"
+		}'`
+		print_bug $title FAILURE, $nerrs
 		exit
 	fi