linux-kernel - [ 36/91] workqueue: skip nr_running sanity check in worker_enter

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Message-Id: <20120527002514.690779089@linuxfoundation.org>
Date:	Sun, 27 May 2012 09:25:42 +0900
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Tejun Heo <tj@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [ 36/91] workqueue: skip nr_running sanity check in worker_enter_idle() if trustee is active

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tejun Heo <tj@...nel.org>

commit 544ecf310f0e7f51fa057ac2a295fc1b3b35a9d3 upstream.

worker_enter_idle() has WARN_ON_ONCE() which triggers if nr_running
isn't zero when every worker is idle.  This can trigger spuriously
while a cpu is going down due to the way trustee sets %WORKER_ROGUE
and zaps nr_running.

It first sets %WORKER_ROGUE on all workers without updating
nr_running, releases gcwq->lock, schedules, regrabs gcwq->lock and
then zaps nr_running.  If the last running worker enters idle
inbetween, it would see stale nr_running which hasn't been zapped yet
and trigger the WARN_ON_ONCE().

Fix it by performing the sanity check iff the trustee is idle.

Signed-off-by: Tejun Heo <tj@...nel.org>
Reported-by: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/workqueue.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1210,8 +1210,13 @@ static void worker_enter_idle(struct wor
 	} else
 		wake_up_all(&gcwq->trustee_wait);

-	/* sanity check nr_running */
-	WARN_ON_ONCE(gcwq->nr_workers == gcwq->nr_idle &&
+	/*
+	 * Sanity check nr_running.  Because trustee releases gcwq->lock
+	 * between setting %WORKER_ROGUE and zapping nr_running, the
+	 * warning may trigger spuriously.  Check iff trustee is idle.
+	 */
+	WARN_ON_ONCE(gcwq->trustee_state == TRUSTEE_DONE &&
+		     gcwq->nr_workers == gcwq->nr_idle &&
 		     atomic_read(get_gcwq_nr_running(gcwq->cpu)));
 }

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