linux-kernel - Fwd: UBIFS recovery taking too long

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Message-ID: <CACwUX0PGGM99-2H41S0eqOVLsh-7+Dan+gcy9deK1movx_wWPQ@mail.gmail.com>
Date:	Mon, 9 Dec 2013 13:53:00 -0700
From:	David Mosberger-Tang <dmosberger@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: Fwd: UBIFS recovery taking too long

I've had no luck getting any response from the linux-mtd mailing list
regarding the issue reported below.
I think it is a very serious issue since it can easily render an
embedded system unusable.

  --david

---------- Forwarded message ----------
From: David Mosberger-Tang <dmosberger@...il.com>
Date: Thu, Nov 7, 2013 at 11:44 AM
Subject: UBIFS recovery taking too long
To: "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>

We recently encountered a strange issue where UBIFS recovery is
suddenly taking a lot longer than usual (v3.7-based kernel).  In our
case, recovery took about 30 seconds.  This caused a serious problem
because our watchdog timer was set to 15 seconds, effectively
rendering the devices unbootable.

Does anybody know what triggers this slow recovery mode?  Also, how
can we calculate a worst-case recovery time for a given flash
chip-size.

Thanks,

  --david
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