linux-ext4 - Re: Regular ext4 error warning with HD in USB dock

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Message-ID: <AANLkTim_5Yx1RQFHYbmh40xx7c5sU9XsXZEzegC4G=1x@mail.gmail.com>
Date:	Tue, 28 Dec 2010 12:30:59 +0200
From:	Amir Goldstein <amir73il@...il.com>
To:	"Ted Ts'o" <tytso@....edu>
Cc:	Rogier Wolff <R.E.Wolff@...wizard.nl>,
	Con Kolivas <kernel@...ivas.org>, linux-kernel@...r.kernel.org,
	adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: Regular ext4 error warning with HD in USB dock

On Tue, Dec 28, 2010 at 10:19 AM, Rogier Wolff <R.E.Wolff@...wizard.nl> wrote:
> On Mon, Dec 27, 2010 at 09:53:43PM -0500, Ted Ts'o wrote:
>> On Tue, Dec 28, 2010 at 09:53:45AM +1100, Con Kolivas wrote:
>> > [1048401.773270] EXT4-fs (sde8): mounted filesystem with writeback data mode.
>> > Opts: (null)
>> > [1048702.736011] EXT4-fs (sde8): error count: 3
>> > [1048702.736016] EXT4-fs (sde8): initial error at 1289053677:
>> > ext4_journal_start_sb:251
>> > [1048702.736018] EXT4-fs (sde8): last error at 1289080948: ext4_put_super:719
>>
>> That's actually not an error.  It's a report which is generated every
>> 24 hours, indicating that there has been 3 errors since the last time
>> the error count has been cleared, with the first error taking place at
>> Sat Nov 6 10:27:57 2010 (US/Eastern) in the function
>> ext4_journal_start_sb(), at line 251, and the most recent error taking
>> place at Sat Nov 6 18:02:28 2010 (US/Eastern), in the function
>> ext4_put_super() at line 719.  This is a new feature which was added
>> in 2.6.36.
>
> Nice. But the issue you're not mentioning is: What errors could have
> happened on the 6th of november? Should Con worry about those errors?
>

Ted,

I would like to use this opportunity to remind you about my
record_journal_errstr()
implementation, see:
https://github.com/amir73il/ext4-snapshots/blob/next3-stable/fs/next3/super.c#L157

It records the initial errors messages (which I found to be the most
interesting),
in a message buffer on the unused space after the journal super block
(3K on a 4K block fs).

fsck prints out those messages and clears the buffer.
In under a year of Next3 fs in beta and production, it has helped me many times
to analyse bugs post-mortem and find the problem.

If there is demand, I can post the patch for Ext4.

Amir.

> OK, the chances are that he has rebooted since november, and that an
> older fsck fixed the errors, but not cleared the "fs errror log". Would
> these errors have triggered a "remount-readonly" if the fs was mounted
> like that?
>
> I don't reboot that often:
>
> obelix:~> uptime
>  09:16:19 up 175 days, 19:04, 19 users,  load average: 110.10, 110.61, 111.22
>
> (and yes, the load is quite high on that machine. I won't polute this
> thread about that....)
>
>        Roger.
>
> --
> ** R.E.Wolff@...Wizard.nl ** http://www.BitWizard.nl/ ** +31-15-2600998 **
> **    Delftechpark 26 2628 XH  Delft, The Netherlands. KVK: 27239233    **
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