linux-kernel - [PATCH] RFC: hung

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Date:   Thu,  2 May 2019 22:46:48 +0200
From:   Daniel Vetter <daniel.vetter@...ll.ch>
To:     Intel Graphics Development <intel-gfx@...ts.freedesktop.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Valdis Kletnieks <valdis.kletnieks@...edu>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "Liu, Chuansheng" <chuansheng.liu@...el.com>
Subject: [PATCH] RFC: hung_task: taint kernel

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.

v2: Works much better when I put the else { add_taint() } at the right
place.

Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: "Paul E. McKenney" <paulmck@...ux.ibm.com>
Cc: Valdis Kletnieks <valdis.kletnieks@...edu>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Vitaly Kuznetsov <vkuznets@...hat.com>
Cc: "Liu, Chuansheng" <chuansheng.liu@...el.com>
---
 kernel/hung_task.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index f108a95882c6..d90d98f53ccb 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -117,6 +117,8 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
 		console_verbose();
 		hung_task_show_lock = true;
 		hung_task_call_panic = true;
+	} else {
+		add_taint(TAINT_WARN, LOCKDEP_STILL_OK);
 	}
 
 	/*
-- 
2.20.1