UBI VID header corruption, offset data

[Richard Weinberger]

On Thu, Dec 19, 2013 at 5:39 AM, Iwo Mergler
<Iwo.Mergler at netcommwireless.com> wrote:
>
> Hi all,
>
>
> I'm encountering a rather surprising VID header corruption. Kernel
> version is derived from 3.5.0-preempt, with a bunch of probably
> unrelated vendor patches.

Let's start simple. Is your MTD driver sane?
UBI/UBIFS issues are often related to subtle NOR/NAND driver bugs.

> After the system has operated normally for a while (=days), the initial
> UBI block scan at boot time reports this:
>
> [    2.390000] UBI error: check_corruption: PEB 402 contains corrupted VID header, and the data does not contain all 0xFF, this may be a non-UBI PEB or a severe VID header corruption which requires manual inspection
> [    3.860000] UBI error: check_corruption: PEB 1176 contains corrupted VID header, and the data does not contain all 0xFF, this may be a non-UBI PEB or a severe VID header corruption which requires manual inspection
> [    4.040000] UBI error: check_corruption: PEB 1177 contains corrupted VID header, and the data does not contain all 0xFF, this may be a non-UBI PEB or a severe VID header corruption which requires manual inspection
> [    5.430000] UBI error: late_analysis: 3 PEBs are corrupted and preserved
>
> All three header pages (2K) are corrupted the same way (see below).
>
> The page starts with 29 0-bytes, followed by 11 0xff-bytes. An
> otherwise normal looking header starts at an offset of 40 bytes
> from its normal position. Finally, there is an unexpected 0xFF
> byte at the end of the page.
>
> Has anyone encountered such a thing before?
>
>
> Best regards,
>
> Iwo
>
> ====
>
> Here is a good VID page example for reference:
>
> PEB257
> 00000000  55 42 49 21 01 01 01 00  00 00 00 00 00 00 02 45  |UBI!...........E|
> 00000010  00 00 00 00 00 01 80 00  00 00 00 00 00 00 00 00  |................|
> 00000020  00 83 72 fa 00 00 00 00  00 00 00 00 00 00 03 cb  |..rú...........Ë|
> 00000030  00 00 00 00 00 00 00 00  00 00 00 00 d4 08 5a bd  |............Ô.Z½|
> 00000040  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> *
> 00000800
>
> These are the bad header pages:
>
> PEB402
> 00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 ff ff ff  |.............ÿÿÿ|
> 00000020  ff ff ff ff ff ff ff ff  55 42 49 21 01 01 01 00  |ÿÿÿÿÿÿÿÿUBI!....|
> 00000030  00 00 00 01 00 00 02 20  00 00 00 00 00 01 70 00  |....... ......p.|
> 00000040  00 00 00 00 00 00 00 00  de 85 51 17 00 00 00 00  |........Þ.Q.....|
> 00000050  00 00 00 00 00 00 13 4a  00 00 00 00 00 00 00 00  |.......J........|
> 00000060  00 00 00 00 36 d4 f2 89  00 00 00 00 00 00 00 00  |....6Ôò.........|
> 00000070  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> *
> 000007f0  00 00 00 00 00 00 00 ff  00 00 00 00 00 00 00 00  |.......ÿ........|
> 00000800
>
> PEB1176
> 00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 ff ff ff  |.............ÿÿÿ|
> 00000020  ff ff ff ff ff ff ff ff  55 42 49 21 01 01 01 00  |ÿÿÿÿÿÿÿÿUBI!....|
> 00000030  00 00 00 01 00 00 01 bc  00 00 00 00 00 00 d0 00  |.......¼......Ð.|
> 00000040  00 00 00 00 00 00 00 00  ff ec 1f a6 00 00 00 00  |........ÿì.¦....|
> 00000050  00 00 00 00 00 00 13 4b  00 00 00 00 00 00 00 00  |.......K........|
> 00000060  00 00 00 00 20 4b 90 e7  00 00 00 00 00 00 00 00  |.... K.ç........|
> 00000070  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> *
> 000007f0  00 00 00 00 00 00 00 ff  00 00 00 00 00 00 00 00  |.......ÿ........|
> 00000800
>
> PEB1177
> 00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 ff ff ff  |.............ÿÿÿ|
> 00000020  ff ff ff ff ff ff ff ff  55 42 49 21 01 01 00 00  |ÿÿÿÿÿÿÿÿUBI!....|
> 00000030  00 00 00 01 00 00 00 07  00 00 00 00 00 00 00 00  |................|
> 00000040  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00000050  00 00 00 00 00 00 13 4c  00 00 00 00 00 00 00 00  |.......L........|
> 00000060  00 00 00 00 1d 0d 60 c5  00 00 00 00 00 00 00 00  |......`Å........|
> 00000070  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> *
> 000007f0  00 00 00 00 00 00 00 ff  00 00 00 00 00 00 00 00  |.......ÿ........|
> 00000800
>
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-- 
Thanks,
//richard