linux-kernel - Re: MTD : Kernel oops when remounting ubifs as read/write

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Message-ID: <51419E3A.8030007@mimc.co.uk>
Date:	Thu, 14 Mar 2013 09:54:02 +0000
From:	Mark Jackson <mpfj-list@...c.co.uk>
To:	dedekind1@...il.com
CC:	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>, adrian.hunter@...el.com
Subject: Re: MTD : Kernel oops when remounting ubifs as read/write

On 14/03/13 09:13, Artem Bityutskiy wrote:
> On Wed, 2013-03-13 at 11:12 +0000, Mark Jackson wrote:
>> Sorry ... this just locks up the unit.
> 
> OK, I've reproduced the issue with 3.9-rc2 in nandsim, see the details
> below. The patch I proposed did not get the error path correctly, but it
> does fix the issue.
> 
> I think what you treat as "lockup" is the fixup process. UBIFS basically
> reads the entire UBI volume and writes it back. And it uses the atomic
> change UBI service, which means it also calculates CRC of everything it
> writes. And this all just takes a lot of time. This has to be done only
> once on the first mount.

Okay ... I've retried, but how long is "a lot of time" ?

I've waited 15 minutes and still nothing.

And I can see that there's no activity on the NAND chip select !?!

I'll put some debug info into the fixup routines to see if I can trace what's going on.

Regards
Mark J.

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