linux-kernel - Re: [linux-next][XFS][trinity] WARNING: CPU: 32 PID: 31369 at fs/iomap.c:993

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Message-ID: <20170918154328.GA32076@ZenIV.linux.org.uk>
Date:   Mon, 18 Sep 2017 16:43:29 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Christoph Hellwig <hch@....de>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Abdul Haleem <abdhalee@...ux.vnet.ibm.com>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        linux-next <linux-next@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        chandan <chandan@...ux.vnet.ibm.com>
Subject: Re: [linux-next][XFS][trinity] WARNING: CPU: 32 PID: 31369 at
 fs/iomap.c:993

On Mon, Sep 18, 2017 at 05:39:47PM +0200, Christoph Hellwig wrote:
> On Mon, Sep 18, 2017 at 09:28:55AM -0600, Jens Axboe wrote:
> > If it's expected, why don't we kill the WARN_ON_ONCE()? I get it all
> > the time running xfstests as well.
> 
> Dave insisted on it to decourage users/applications from mixing
> mmap and direct I/O.
> 
> In many ways a tracepoint might be the better way to diagnose these.

sysctl suppressing those two, perhaps?