ktest: Sync before reboot

Before rebooting the target, run the sync command, as it seems that
either Grub2 or systemd gets screwed up if you update to reboot a kernel
once and do a reboot without doing a sync.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index 63245a56aca3..f4b8f96a9430 100755
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -1147,6 +1147,9 @@ sub wait_for_monitor;
 sub reboot {
     my ($time) = @_;
 
+    # Make sure everything has been written to disk
+    run_ssh("sync");
+
     if (defined($time)) {
         start_monitor;
         # flush out current monitor