linux-kernel - [PATCH] watchdog: print all locks on a softlock

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Message-Id: <1398970535-6880-1-git-send-email-eparis@redhat.com>
Date:	Thu,  1 May 2014 14:55:35 -0400
From:	Eric Paris <eparis@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Eric Paris <eparis@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Don Zickus <dzickus@...hat.com>, Michal Hocko <mhocko@...e.cz>,
	Ben Zhang <benzh@...omium.org>
Subject: [PATCH] watchdog: print all locks on a softlock

If the CPU hits a softlockup this patch will also have it print the
information about all locks being held on the system.  This might help
determine if a lock is being held too long leading to this problem.

Signed-off-by: Eric Paris <eparis@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Michal Hocko <mhocko@...e.cz>
Cc: Ben Zhang <benzh@...omium.org>
---
 kernel/watchdog.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 516203e..a027240 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -322,6 +322,7 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
 			current->comm, task_pid_nr(current));
 		print_modules();
 		print_irqtrace_events(current);
+		debug_show_all_locks();
 		if (regs)
 			show_regs(regs);
 		else
-- 
1.9.0

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