UBIFS CRC error, calculated from ubifs_check_node

[Richard Weinberger]

On Sun, Apr 20, 2014 at 8:39 PM, Tanya Brokhman <tlinder at codeaurora.org> wrote:
> Hi All
>
> I'm hitting "UBIFS error (pid 1026): ubifs_check_node: bad CRC: calculated
> 0x79dbca01, read 0x31afb5d7" and as a result the partition is remounted as
> RO.
>
> I'm using 3.10 based kernel.
> The test scenario to reproduce this is:
> 1. fill the partition tested using dd
> 2. try to write some more data
>
> There are no errors in the log from the ubi layer or from the underlying
> nand driver, both also testing crc.
>
> I've tried disabling compression, mounting the partition as sync and issuing
> the write command with sync param. None of the former has any effect on this
> crash.
> I tried disabling crc on data nodes. This lowered the possibility of hitting
> the above error but eventually, with stress test of concurrent read and
> write we hit the same error with a different node type.
>
> Has any one encountered similar behavior? I'm not that much familiar with
> ubifs so any help will be highly apritiated!

Before we start digging into this, do mtd-tests and ubi-tests pass?

-- 
Thanks,
//richard