linux-ext4 - Re: process hangs in ext4_sync

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Message-ID: <20140106143203.GA13648@thunk.org>
Date:	Mon, 6 Jan 2014 09:32:03 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Sandeep Joshi <sanjos100@...il.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: process hangs in ext4_sync_file

On Mon, Jan 06, 2014 at 03:58:58PM +0530, Sandeep Joshi wrote:
> I reported a problem with process hanging in ext4 sync on a SSD a few weeks ago
> See this thread http://www.spinics.net/lists/linux-ext4/msg40369.html
> 
> That was on a SSD with discard option enabled.  I was asked to turn
> that off which I did and never hit the issue again.
> 
> Today I saw the same problem on an ext4 filesystem mounted on a loop
> device.  The stack is *identical*.

What model SSD are you using?  This looks like the we're just waiting
for the SSD to acknowledge that the write has been completed.  This
really smells like a case of a crappy SSD....

					- Ted
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