RE: UBIFS corruption in empty space during mount

From: Barak Adam <BAdam@adva.com>
To: Richard Weinberger <richard.weinberger@gmail.com>
Cc: "linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>
Subject: RE: UBIFS corruption in empty space during mount
Date: Thu, 29 Oct 2020 14:52:07 +0000	[thread overview]
Message-ID: <1ffeedca15604810936ebb032b9af57c@adva.com> (raw)
In-Reply-To: <CAFLxGvyZUBgXyNkj0EO5pWntjfn7jObqU7XKZXxvjsQ=RN9WKw@mail.gmail.com>

<Barak,

<<On Thu, Oct 29, 2020 at 5:54 AM Barak Adam <BAdam@adva.com> wrote:
<> ubi_leb_read calls lower layer nand driver functions but finally returns with -EBADMSG error code indicating that the MTD driver has detected a data integrity problem (unrecoverable ECC checksum mismatch in case of NAND).

<So, your driver is facing ECC errors while reading empty space?
<This is something UBIFS does not expect.

<If this is really the case, please double check, you can try to backport the patches you've listed.
<Or change the driver. In any case UBIFS does not want to see ECC errors when reading eased pages.

<--
<Thanks,
<//Richard

Thanks Richard.

I already applied those patches, but the issue is not yet covered / resolved.

What kind of a fix should I apply to the driver layer - raise ECC errors for the upper layers even when ready empty / erased area ?

Thanks,
Barak

-----Original Message-----
From: Richard Weinberger <richard.weinberger@gmail.com>
Sent: Thursday, October 29, 2020 12:36 PM
To: Barak Adam <BAdam@adva.com>
Cc: linux-mtd@lists.infradead.org
Subject: Re: UBIFS corruption in empty space during mount

External email: [richard.weinberger@gmail.com]

......................................................................
Barak,

On Thu, Oct 29, 2020 at 5:54 AM Barak Adam <BAdam@adva.com> wrote:
> ubi_leb_read calls lower layer nand driver functions but finally returns with -EBADMSG error code indicating that the MTD driver has detected a data integrity problem (unrecoverable ECC checksum mismatch in case of NAND).

So, your driver is facing ECC errors while reading empty space?
This is something UBIFS does not expect.

If this is really the case, please double check, you can try to backport the patches you've listed.
Or change the driver. In any case UBIFS does not want to see ECC errors when reading eased pages.

--
Thanks,
//richard
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