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workqueue: skip nr_running sanity check in worker_enter_idle() if trustee is active

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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@kernel.org>
Reported-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2012-05-14 15:04:50 -07:00 committed by Greg Kroah-Hartman
parent d560ed31a5
commit f93a328855
1 changed files with 7 additions and 2 deletions
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9
kernel/workqueue.c
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@ -1215,8 +1215,13 @@ static void worker_enter_idle(struct worker *worker)
} 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)));
}