From d3920cdd0490d39f1303a5751ce666c5685bda25 Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu, 2 May 2019 22:46:48 +0200
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.
References: https://gitlab.freedesktop.org/drm/intel/-/issues/8034
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: "Paul E. McKenney" <paulmck@linux.ibm.com>
Cc: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: "Liu, Chuansheng" <chuansheng.liu@intel.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk> (for core-for-CI)
Link: https://patchwork.freedesktop.org/patch/msgid/20190502204648.5537-1-daniel.vetter@ffwll.ch
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
kernel/hung_task.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index c18717189f322..d08ebe9c27ef7 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -132,6 +132,8 @@ 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);
}
/*
--
GitLab