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Subject: workqueue destruction BUG_ON
From: Johannes Berg <johannes@sipsolutions.net>
To: Tejun Heo <tj@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>
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Date: Tue, 24 Aug 2010 10:55:56 +0200
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Tejun, all,

In our testing with iwlwifi, we keep running into this BUG_ON:

	BUG_ON(cwq->nr_active);

in destroy_workqueue(). This is quite unhelpful, and since the code
flushes the workqueue I really don't see how this could be happening,
unless maybe there's cross-talk between this and other workqueues?

johannes