linux-kernel - Re: net/bluetooth: workqueue destruction WARNING in hci_unregister

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Message-ID: <20160218174427.GG13177@mtj.duckdns.org>
Date:	Thu, 18 Feb 2016 12:44:27 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Jiri Slaby <jslaby@...e.cz>, Marcel Holtmann <marcel@...tmann.org>,
	Gustavo Padovan <gustavo@...ovan.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-bluetooth@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Takashi Iwai <tiwai@...e.com>
Subject: Re: net/bluetooth: workqueue destruction WARNING in
 hci_unregister_dev

Hello,

Can you please do the followings?

1. Remove WQ_MEM_RECLAIM from the affected workqueue and see whether
   the problem is reproducible.  WQ_MEM_RECLAIM on anything bluetooth
   doesn't make sense btw.  Why is it there?

2. If WQ_MEM_RECLAIM makes the issue go away, see whether the attached
   patch works too.

Thanks.

-- 
tejun

View attachment "patch" of type "text/plain" (1184 bytes)