UBIFS CRC error, calculated from ubifs_check_node

[Richard Weinberger]

Am 20.04.2014 23:24, schrieb Tanya Brokhman:
> On 4/20/2014 11:55 PM, Richard Weinberger wrote:
>> 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?
>>
> 
> 
> mtd-tests: yes.

Good. :)

> ubi-tests: never run those. Where can I find them? I see only debug.c at mtd/ubi with helping functions but no tests.
> 
> We're just switching to ubifs from yaffs2. I looked at the diff between linux-next and our branch (3.10 based) and tried to bring in all of the fixes in mtd and ubi layers.
> I'll try running ubi-tests and update on the result.
> 
> Do you think we should run ubifs tests as well? Are there such tests?

Yes. Fetch mtd-utils source.
See tests/ubi-tests directory.
It contains UBI and UBIFS tests.

Please run first ubi tests (runtests.sh).

Thanks,
//richard