[3.11.y.z extended stable] Patch "hung_task: check the value of "sysctl_hung_task_timeout_sec"" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    hung_task: check the value of "sysctl_hung_task_timeout_sec"

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 2cd79ccf072a4a4a2397c877700786a1ca6811b0 Mon Sep 17 00:00:00 2001
From: Liu Hua <sdu.liu at huawei.com>
Date: Mon, 7 Apr 2014 15:38:57 -0700
Subject: hung_task: check the value of "sysctl_hung_task_timeout_sec"

commit 80df28476505ed4e6701c3448c63c9229a50c655 upstream.

As sysctl_hung_task_timeout_sec is unsigned long, when this value is
larger then LONG_MAX/HZ, the function schedule_timeout_interruptible in
watchdog will return immediately without sleep and with print :

  schedule_timeout: wrong timeout value ffffffffffffff83

and then the funtion watchdog will call schedule_timeout_interruptible
again and again.  The screen will be filled with

	"schedule_timeout: wrong timeout value ffffffffffffff83"

This patch does some check and correction in sysctl, to let the function
schedule_timeout_interruptible allways get the valid parameter.

Signed-off-by: Liu Hua <sdu.liu at huawei.com>
Tested-by: Satoru Takeuchi <satoru.takeuchi at gmail.com>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
[ luis: backported to 3.11:
  - pick hung_task_timeout_secs documentation from commit 270750d
    ("hung_task: Display every hung task warning") ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 Documentation/sysctl/kernel.txt | 11 +++++++++++
 kernel/sysctl.c                 |  6 ++++++
 2 files changed, 17 insertions(+)

diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 7ea3a96..1bf2a24 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -286,6 +286,17 @@ Default value is "/sbin/hotplug".

 ==============================================================

+hung_task_timeout_secs:
+
+Check interval. When a task in D state did not get scheduled
+for more than this value report a warning.
+This file shows up if CONFIG_DETECT_HUNG_TASK is enabled.
+
+0: means infinite timeout - no checking done.
+Possible values to set are in range {0..LONG_MAX/HZ}.
+
+==============================================================
+
 kptr_restrict:

 This toggle indicates whether restrictions are placed on
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index f252045..8515e5f 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -143,6 +143,11 @@ static int min_percpu_pagelist_fract = 8;
 static int ngroups_max = NGROUPS_MAX;
 static const int cap_last_cap = CAP_LAST_CAP;

+/*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
+#ifdef CONFIG_DETECT_HUNG_TASK
+static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
+#endif
+
 #ifdef CONFIG_INOTIFY_USER
 #include <linux/inotify.h>
 #endif
@@ -972,6 +977,7 @@ static struct ctl_table kern_table[] = {
 		.maxlen		= sizeof(unsigned long),
 		.mode		= 0644,
 		.proc_handler	= proc_dohung_task_timeout_secs,
+		.extra2		= &hung_task_timeout_max,
 	},
 	{
 		.procname	= "hung_task_warnings",
--
1.9.1