linux-ext4 - Re: [PATCH 2/2] jbd: fix fsync() tid wraparound bug

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Message-ID: <20110502190441.GK4556@quack.suse.cz>
Date:	Mon, 2 May 2011 21:04:41 +0200
From:	Jan Kara <jack@...e.cz>
To:	Ted Ts'o <tytso@....edu>
Cc:	Jan Kara <jack@...e.cz>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Martin_Zielinski@...fee.com
Subject: Re: [PATCH 2/2] jbd: fix fsync() tid wraparound bug

On Mon 02-05-11 14:29:45, Ted Tso wrote:
> On Mon, May 02, 2011 at 05:07:58PM +0200, Jan Kara wrote:
> >   The patch looks OK in any case. I'll take it in my tree.
> Great, thanks.
> 
> > It would take
> > about 24 days of constant 1000 trans/s load to trigger this. That's a quite
> > heavy load but not so unrealistic with today's HW.
> 
> True; but one of the reason why I'm not sure I believe that is this
> bug is showing up on some Android devices, where (a) 1000 trans/second
> *is* a not just a huge load, but almost impossible to believe, and (b)
> if we really are doing 2**31 commits, we would be wearing out the
> flash storage being used on the Android devices!  (And we're seeing a
> handful of failures every week from the testers who participate in a
> kerneloops-like reporting system.)
  Ah, OK. I didn't know it's so many reports. Indeed it looks like there's
another bug. But then the WARN you have added should tell us more about
who's causing the problem, right?

								Honza

-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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