linux-kernel - Re: WARN_ON_ONCE in fs/iomap.c:993

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Message-ID: <20170911164629.4kuuqgklyelld7am@codemonkey.org.uk>
Date:   Mon, 11 Sep 2017 12:46:29 -0400
From:   Dave Jones <davej@...emonkey.org.uk>
To:     Shankara Pailoor <sp3485@...umbia.edu>
Cc:     linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        Andrew Zhu Aday <andrew.aday@...umbia.edu>,
        syzkaller <syzkaller@...glegroups.com>, viro@...iv.linux.org.uk
Subject: Re: WARN_ON_ONCE in fs/iomap.c:993

On Mon, Sep 11, 2017 at 06:56:05AM -0400, Shankara Pailoor wrote:
 > Hi,
 > 
 > I am fuzzing linux 4.13-rc7 with XFS using syzkaller on x86_64 and I
 > found the following warning:
 > 
 > WARNING: CPU: 2 PID: 5391 at fs/iomap.c:993 iomap_dio_rw+0xc79/0xe70
 > 
 > Here is a reproducer program: https://pastebin.com/tc014k97

pwrite in one thread, sendfile on another. Same thing trinity has been hitting.
 
See thread "Subject: Re: iov_iter_pipe warning".

	Dave