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| author | Liu Hua <sdu.liu@huawei.com> | 2014-04-07 15:38:57 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-06 07:59:35 -0700 |
| commit | dfe468daba552b4d474db75ff54562691150bb78 (patch) | |
| tree | 7248942c8852c6c37297fd3b2dcfd43fa2d310a3 /Documentation | |
| parent | 05b36270c305cf8e4d0d2b29b89c42f7ecd77d1c (diff) | |
| download | linux-stable-dfe468daba552b4d474db75ff54562691150bb78.tar.gz linux-stable-dfe468daba552b4d474db75ff54562691150bb78.tar.bz2 linux-stable-dfe468daba552b4d474db75ff54562691150bb78.zip | |
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@huawei.com>
Tested-by: Satoru Takeuchi <satoru.takeuchi@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/sysctl/kernel.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index e55124e7c40c..855d9b37bf76 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -317,6 +317,7 @@ 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}. ============================================================== |