linux-kernel - Re: Fwd: [rhashtable] WARNING: CPU: 0 PID: 10 at kernel/locking/mutex.c:570 mutex_lock

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Message-ID: <20150113192847.GP20387@casper.infradead.org>
Date:	Tue, 13 Jan 2015 19:28:47 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Cong Wang <cwang@...pensource.com>
Cc:	Ying Xue <ying.xue@...driver.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	lkp@...org, Netdev <netdev@...r.kernel.org>
Subject: Re: Fwd: [rhashtable] WARNING: CPU: 0 PID: 10 at
 kernel/locking/mutex.c:570 mutex_lock_nested()

On 01/13/15 at 11:14am, Cong Wang wrote:
> On Tue, Jan 13, 2015 at 12:41 AM, Thomas Graf <tgraf@...g.ch> wrote:
> > I can't reproduce it in my KVM box either so far. It looks like a
> > mutex_lock() on an uninitialized mutex or use after free but I can't
> > find such a code path so far.
> 
> Couldn't that be the delayed work is still running after rhashtable
> is destroyed by its caller? I mean, cancel_delayed_work_sync()
> should be called in rhashtable_destroy()?
> 
> Of course, it may be caller's responsibility to ensure that, I haven't
> looked into it that much.

Yes, we came to the very same conclusion in a different email thread
and found the offending race condition.
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