[tip: core/rcu] rcutorture: Make kvm-recheck-rcu.sh handle truncated lines

[tip-bot2 for Paul E. McKenney]

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

Commit-ID:     b3578186b28da4ed5d0852ec69c13a7bce15b5fd
Gitweb:        https://git.kernel.org/tip/b3578186b28da4ed5d0852ec69c13a7bce15b5fd
Author:        Paul E. McKenney <paulmck@xxxxxxxxxx>
AuthorDate:    Fri, 14 Feb 2020 14:43:44 -08:00
Committer:     Paul E. McKenney <paulmck@xxxxxxxxxx>
CommitterDate: Mon, 27 Apr 2020 11:05:13 -07:00

rcutorture: Make kvm-recheck-rcu.sh handle truncated lines

System hangs or killed rcutorture guest OSes can result in truncated
"Reader Pipe:" lines, which can in turn result in false-positive
reader-batch near-miss warnings.  This commit therefore adjusts the
reader-batch checks to account for possible line truncation.

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
 tools/testing/selftests/rcutorture/bin/kvm-recheck-rcu.sh | 16 ++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcu.sh b/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcu.sh
index 9d9a416..1706cd4 100755
--- a/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcu.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcu.sh
@@ -41,7 +41,21 @@ else
 		title="$title ($ngpsps/s)"
 	fi
 	echo $title $stopstate $fwdprog
-	nclosecalls=`grep --binary-files=text 'torture: Reader Batch' $i/console.log | tail -1 | awk '{for (i=NF-8;i<=NF;i++) sum+=$i; } END {print sum}'`
+	nclosecalls=`grep --binary-files=text 'torture: Reader Batch' $i/console.log | tail -1 | \
+		awk -v sum=0 '
+		{
+			for (i = 0; i <= NF; i++) {
+				sum += $i;
+				if ($i ~ /Batch:/) {
+					sum = 0;
+					i = i + 2;
+				}
+			}
+		}
+
+		END {
+			print sum
+		}'`
 	if test -z "$nclosecalls"
 	then
 		exit 0