From: Austin Schuh <austin-U/e3ovGPoBiXmMXjJBpWqg@public.gmane.org>
Subject: Re: Hang writing to nfs-mounted filesystem from client, all nfsd
 tasks on server blocked in D
Date: Fri, 17 Oct 2014 11:58:00 -0700
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Cc: linux-nfs <linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"J. Bruce Fields" <bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>,
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To: Chris Friesen <chris.friesen-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org>
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On Fri, Oct 17, 2014 at 10:50 AM, Chris Friesen
<chris.friesen-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org> wrote:
> Where generic_file_aio_write() is calling mutex_lock(&inode->i_mutex).


Use the 121 patch.  This sounds very similar to the issue that I
helped debug with XFS.  There ended up being a deadlock due to a bug
in the kernel work queues.  You can search the RT archives for more
info.
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