The latest fio after the commit 1d282baecd68 ("fio: make sure that child
process output is comitted") often prints the warning messages about
random generator selection:

    fio: file test.0.0 exceeds 32-bit tausworthe random generator.
    fio: Switching to tausworthe64. Use the random_generator= option to get rid of this warning.

This causes fio output parse failure at the test case block/004. To
avoid the failure, ignore the messages.

Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
---
 common/fio | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/common/fio b/common/fio
index 91f4b23..8d95e5a 100644
--- a/common/fio
+++ b/common/fio
@@ -229,7 +229,9 @@ _fio_perf_report() {
 			echo "_fio_perf: too many terse lines" >&2
 			return
 		fi
-	} <"$TMPDIR/fio_perf"
+		# Fio often spits out message about random generator switch from
+		# tausworthe to tausworthe64. Ignore the message.
+	} < <(grep --invert-match tausworthe "$TMPDIR/fio_perf")
 
 	for name in "${FIO_PERF_FIELDS[@]}"; do
 		field="${FIO_TERSE_FIELDS["$name"]}"
-- 
2.52.0