From: Ross Zwisler <ross.zwisler-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Subject: Re: [ext4]  e2ae766c1b:
 BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/rwsem.c
Date: Mon, 12 Dec 2016 15:48:51 -0700
Message-ID: <20161212224851.GA691@linux.intel.com>
References: <20161212101321.GA37214@inn.lkp.intel.com>
 <20161212163518.GA20728@quack2.suse.cz>
 <20161212221329.GB3622@linux.intel.com>
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To: Theodore Ts'o <tytso-3s7WtUTddSA@public.gmane.org>, Ross Zwisler <ross.zwisler-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
 Jan Kara <jack-AlSwsSmVLrQ@public.gmane.org>, kernel test robot <xiaolong.ye-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
 LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
 lkp-JC7UmRfGjtg@public.gmane.org, linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org, Dave Chinner <david-FqsqvQoI3Ljby3iVrkZq2A@public.gmane.org>
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On Mon, Dec 12, 2016 at 05:37:36PM -0500, Theodore Ts'o wrote:
> Is this problem likely to happen in other file systems?  Should I take
> this path through the ext4 tree, or would it be better via some other
> git tree?
> 
> 					- Ted

The problem is in the generic DAX code and affects ext4 and xfs equally (ext2
doesn't support PMDs).