linux-ext4 - Re: Hang writing to nfs-mounted filesystem from client, all nfsd tasks on server blocked in D

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Message-ID: <CANGgnMYqgaCDPAr7Q8qx3BW5_w9HsNv-uHcVERphfMxcak7vvg@mail.gmail.com>
Date:	Fri, 17 Oct 2014 11:58:00 -0700
From:	Austin Schuh <austin@...oton-tech.com>
To:	Chris Friesen <chris.friesen@...driver.com>
Cc:	linux-nfs <linux-nfs@...r.kernel.org>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	linux-ext4 <linux-ext4@...r.kernel.org>, tytso <tytso@....edu>,
	"adilger.kernel" <adilger.kernel@...ger.ca>,
	rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: Hang writing to nfs-mounted filesystem from client, all nfsd
 tasks on server blocked in D

On Fri, Oct 17, 2014 at 10:50 AM, Chris Friesen
<chris.friesen@...driver.com> 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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