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Re: XFS locking issues in 3.18-rc3+

To: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Subject: Re: XFS locking issues in 3.18-rc3+
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Fri, 14 Nov 2014 16:25:23 +1100
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <CALCETrWN71T1JsSNix52+ez_Sxt4i+vL-fX_2RTNbt8Ex1p=vw@xxxxxxxxxxxxxx>
References: <CALCETrWN71T1JsSNix52+ez_Sxt4i+vL-fX_2RTNbt8Ex1p=vw@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Thu, Nov 13, 2014 at 04:57:11PM -0800, Andy Lutomirski wrote:
> I'm running a kernel somewhere between 3.18-rc3 and 3.18-rc4.  I got
> the warnings below.  Is this a known issue?

Yup, false positive. shmem is instantiating an inode under the
mmap_sem and in doing so taking inode locks under the mmap_sem,
which triggers other filesystems to issue false warnings about
mmap_sem <-> inode lock order.

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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