linux-kernel - [PATCH] locking/hung_task: Defer showing held locks

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Date:   Tue, 13 Dec 2016 23:45:25 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     linux-kernel@...r.kernel.org
Cc:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mandeep Singh Baines <msb@...omium.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>
Subject: [PATCH] locking/hung_task: Defer showing held locks

When I was running my testcase which may block hundreds of threads
on fs locks, I got lockup due to output from debug_show_all_locks()
added by commit b2d4c2edb2e4f89a ("locking/hung_task: Show all locks").

I think we don't need to call debug_show_all_locks() on each blocked
thread. Let's defer calling debug_show_all_locks() till before panic()
or leaving for_each_process_thread() loop.

Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc: Vegard Nossum <vegard.nossum@...cle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mandeep Singh Baines <msb@...omium.org>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
---
 kernel/hung_task.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 2b59c82..a9ada5d 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -40,6 +40,7 @@
 int __read_mostly sysctl_hung_task_warnings = 10;
 
 static int __read_mostly did_panic;
+static bool hung_task_show_lock;
 
 static struct task_struct *watchdog_task;
 
@@ -116,12 +117,14 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
 		pr_err("\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\""
 			" disables this message.\n");
 		sched_show_task(t);
-		debug_show_all_locks();
+		hung_task_show_lock = true;
 	}
 
 	touch_nmi_watchdog();
 
 	if (sysctl_hung_task_panic) {
+		if (hung_task_show_lock)
+			debug_show_all_locks();
 		trigger_all_cpu_backtrace();
 		panic("hung_task: blocked tasks");
 	}
@@ -168,6 +171,7 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout)
 	if (test_taint(TAINT_DIE) || did_panic)
 		return;
 
+	hung_task_show_lock = false;
 	rcu_read_lock();
 	for_each_process_thread(g, t) {
 		if (!max_count--)
@@ -183,6 +187,8 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout)
 	}
  unlock:
 	rcu_read_unlock();
+	if (hung_task_show_lock)
+		debug_show_all_locks();
 }
 
 static long hung_timeout_jiffies(unsigned long last_checked,
-- 
1.8.3.1