[PATCH 1/2] RFC: hung_task: taint kernel

[Daniel Vetter]

There's the hung_task_panic sysctl, but that's a bit an extreme measure.
As a fallback taint at least the machine.

Our CI uses this to decide when a reboot is necessary, plus to figure
out whether the kernel is still happy.

Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxx>
Cc: Valdis Kletnieks <valdis.kletnieks@xxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Cc: "Liu, Chuansheng" <chuansheng.liu@xxxxxxxxx>
---
 kernel/hung_task.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index f108a95882c6..7fae16f1b49c 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -203,6 +203,8 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout)
 	if (hung_task_call_panic) {
 		trigger_all_cpu_backtrace();
 		panic("hung_task: blocked tasks");
+	} else {
+		add_taint(TAINT_WARN, LOCKDEP_STILL_OK);
 	}
 }
 
-- 
2.20.1