linux-kernel - [PACTH v1] kernel/hung_task.c: Dump all UNINTERUPTIBLE tasks

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Message-Id: <1470151391-16420-1-git-send-email-robert.foss@collabora.com>
Date:	Tue,  2 Aug 2016 11:23:11 -0400
From:	robert.foss@...labora.com
To:	adurbin@...omium.org, penguin-kernel@...ove.SAKURA.ne.jp,
	robert.foss@...labora.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: [PACTH v1] kernel/hung_task.c: Dump all UNINTERUPTIBLE tasks

From: Aaron Durbin <adurbin@...omium.org>

When the panic path is taken for khungtaskd dump all
tasks with the UNINTERUPTIBLE state. That way, any
inter-dependent tasks that caused one another to hang
will be saved in the crash output.

Signed-off-by: Aaron Durbin <adurbin@...omium.org>
Tested-by: Robert Foss <robert.foss@...labora.com>
Signed-off-by: Robert Foss <robert.foss@...labora.com>
---
 kernel/hung_task.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index d234022..946caf9 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -122,6 +122,8 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
 	touch_nmi_watchdog();
 
 	if (sysctl_hung_task_panic) {
+		/* Dump all tasks. */
+		show_state_filter(TASK_UNINTERRUPTIBLE);
 		trigger_all_cpu_backtrace();
 		panic("hung_task: blocked tasks");
 	}
-- 
2.7.4