Patch "hung_task: check the value of "sysctl_hung_task_timeout_sec"" has been added to the 3.10-stable tree

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This is a note to let you know that I've just added the patch titled

    hung_task: check the value of "sysctl_hung_task_timeout_sec"

to the 3.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     hung_task-check-the-value-of-sysctl_hung_task_timeout_sec.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 80df28476505ed4e6701c3448c63c9229a50c655 Mon Sep 17 00:00:00 2001
From: Liu Hua <sdu.liu@xxxxxxxxxx>
Date: Mon, 7 Apr 2014 15:38:57 -0700
Subject: hung_task: check the value of "sysctl_hung_task_timeout_sec"

From: Liu Hua <sdu.liu@xxxxxxxxxx>

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@xxxxxxxxxx>
Tested-by: Satoru Takeuchi <satoru.takeuchi@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 kernel/sysctl.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -144,6 +144,11 @@ 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
@@ -966,6 +971,7 @@ 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",


Patches currently in stable-queue which might be from sdu.liu@xxxxxxxxxx are

queue-3.10/arm-8030-1-arm-kdump-add-arch_crash_save_vmcoreinfo.patch
queue-3.10/hung_task-check-the-value-of-sysctl_hung_task_timeout_sec.patch
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