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 3.4-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-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 80df28476505ed4e6701c3448c63c9229a50c655 Mon Sep 17 00:00:00 2001
From: Liu Hua <[email protected]>
Date: Mon, 7 Apr 2014 15:38:57 -0700
Subject: hung_task: check the value of "sysctl_hung_task_timeout_sec"
From: Liu Hua <[email protected]>
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 <[email protected]>
Tested-by: Satoru Takeuchi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
kernel/sysctl.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -142,6 +142,11 @@ 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
@@ -897,6 +902,7 @@ 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 [email protected] are
queue-3.4/arm-8030-1-arm-kdump-add-arch_crash_save_vmcoreinfo.patch
queue-3.4/hung_task-check-the-value-of-sysctl_hung_task_timeout_sec.patch
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