The patch titled
Subject: hung_task: allow hung_task_panic when hung_task_warnings is 0
has been added to the -mm tree. Its filename is
hung_task-allow-hung_task_panic-when-hung_task_warnings-is-0.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/hung_task-allow-hung_task_panic-when-hung_task_warnings-is-0.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/hung_task-allow-hung_task_panic-when-hung_task_warnings-is-0.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: John Siddle <jsiddle@xxxxxxxxxx>
Subject: hung_task: allow hung_task_panic when hung_task_warnings is 0
Previously hung_task_panic would not be respected if enabled after
hung_task_warnings had already been decremented to 0.
Permit the kernel to panic if hung_task_panic is enabled after
hung_task_warnings has already been decremented to 0 and another task
hangs for hung_task_timeout_secs seconds.
Check if hung_task_panic is enabled so we don't return prematurely, and
check if hung_task_warnings is non-zero so we don't print the warning
unnecessarily.
Link: http://lkml.kernel.org/r/1473450214-4049-1-git-send-email-jsiddle@xxxxxxxxxx
Signed-off-by: John Siddle <jsiddle@xxxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/hung_task.c | 24 +++++++++++++-----------
1 file changed, 13 insertions(+), 11 deletions(-)
diff -puN kernel/hung_task.c~hung_task-allow-hung_task_panic-when-hung_task_warnings-is-0 kernel/hung_task.c
--- a/kernel/hung_task.c~hung_task-allow-hung_task_panic-when-hung_task_warnings-is-0
+++ a/kernel/hung_task.c
@@ -98,7 +98,7 @@ static void check_hung_task(struct task_
trace_sched_process_hang(t);
- if (!sysctl_hung_task_warnings)
+ if (!sysctl_hung_task_warnings && !sysctl_hung_task_panic)
return;
if (sysctl_hung_task_warnings > 0)
@@ -108,16 +108,18 @@ static void check_hung_task(struct task_
* Ok, the task did not get scheduled for more than 2 minutes,
* complain:
*/
- pr_err("INFO: task %s:%d blocked for more than %ld seconds.\n",
- t->comm, t->pid, timeout);
- pr_err(" %s %s %.*s\n",
- print_tainted(), init_utsname()->release,
- (int)strcspn(init_utsname()->version, " "),
- init_utsname()->version);
- pr_err("\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\""
- " disables this message.\n");
- sched_show_task(t);
- debug_show_held_locks(t);
+ if (sysctl_hung_task_warnings) {
+ pr_err("INFO: task %s:%d blocked for more than %ld seconds.\n",
+ t->comm, t->pid, timeout);
+ pr_err(" %s %s %.*s\n",
+ print_tainted(), init_utsname()->release,
+ (int)strcspn(init_utsname()->version, " "),
+ init_utsname()->version);
+ pr_err("\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\""
+ " disables this message.\n");
+ sched_show_task(t);
+ debug_show_held_locks(t);
+ }
touch_nmi_watchdog();
_
Patches currently in -mm which might be from jsiddle@xxxxxxxxxx are
hung_task-allow-hung_task_panic-when-hung_task_warnings-is-0.patch
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