netdev - Re: possible circular locking dependency detected

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Message-ID: <20160902175347.GW2356@ZenIV.linux.org.uk>
Date:   Fri, 2 Sep 2016 18:53:48 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Rainer Weikusat <rweikusat@...eradapt.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        CAI Qian <caiqian@...hat.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        Eric Sandeen <esandeen@...hat.com>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: possible circular locking dependency detected

On Fri, Sep 02, 2016 at 06:40:59PM +0100, Rainer Weikusat wrote:

> The original deadlock occurred because of some code path locking the
> superblock followed by trying to acquire the af_unix readlock while

Not even that - one code path takes ->readlock under pipe lock, while
another takes pipe lock under sb_start_write...