linux-ext4 - Re: process hangs in ext4_sync

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Message-ID: <CAEfL3K=TZYW0GQgqUBPjaL1T4y8tEG-Kxkdn2_gv+N_rdK3fLg@mail.gmail.com>
Date:	Mon, 6 Jan 2014 20:38:05 +0530
From:	Sandeep Joshi <sanjos100@...il.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: process hangs in ext4_sync_file

On Mon, Jan 6, 2014 at 8:02 PM, Theodore Ts'o <tytso@....edu> wrote:
> 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

Ted,

Forgot to mention that in this case the loop device was on a hard
device on my laptop.
No SSD involved in this failure.

-Sandeep
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