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Subject[PATCH 5/5] ktest: Test if target machine is up before install
From: Steven Rostedt <>

Sometimes a test kernel will crash or hang on reboot (this is even more
apparent when testing a config without CGROUPS on a box running
systemd). When this happens, on the next iteration of installing a
kernel, ktest will fail when it tries to install.

Have ktest do a check to see if the target can be connected to via ssh
before it tries to install. If it can't connect, then reboot again.
This time the reboot will fail because it can't connect and will force a
power cycle.

Signed-off-by: Steven Rostedt <>
tools/testing/ktest/ | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/tools/testing/ktest/ b/tools/testing/ktest/
index 6b1e0c5..35fc584 100755
--- a/tools/testing/ktest/
+++ b/tools/testing/ktest/
@@ -1807,6 +1807,14 @@ sub do_post_install {
dodie "Failed to run post install";

+# Sometimes the reboot fails, and will hang. We try to ssh to the box
+# and if we fail, we force another reboot, that should powercycle it.
+sub test_booted {
+ if (!run_ssh "echo testing connection") {
+ reboot $sleep_time;
+ }
sub install {

return if ($no_install);
@@ -1819,6 +1827,8 @@ sub install {

my $cp_target = eval_kernel_version $target_image;

+ test_booted;
run_scp_install "$outputdir/$build_target", "$cp_target" or
dodie "failed to copy image";


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