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From: Bhuvanchandra DV <bhuvanchandradv@gmail.com>
Subject: Re: UBIFS errors when file-system is full
To: Richard Weinberger <richard@nod.at>,
 Bhuvanchandra DV <bhuvanchandradv@gmail.com>
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Date: Tue, 14 Jul 2015 12:00:18 +0530
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On 07/14/2015 11:43 AM, Richard Weinberger wrote:

> Am 14.07.2015 um 06:23 schrieb Bhuvanchandra DV:
>> Hello Richard,
>>
>> On 07/13/2015 07:39 PM, Richard Weinberger wrote:
>>
>>> On Mon, Jul 13, 2015 at 3:55 PM, Bhuvanchandra DV
>>> <bhuvanchandradv@gmail.com> wrote:
>>>> Hello,
>>>>
>>>> Facing some issues with UBIFS mounting when NAND flash is almost near to
>>>> full.
>>>>
>>>> Hardware:
>>>> SOC: Freescale Vybrid
>>>> COM: Colibri VF50
>>>> Flash: Macronic NAND 128MB, 3.3V, 8-Bit
>>>>
>>>> By default the Linux Image flashed on the NAND flash almost occupies ~93% of
>>>> the flash.
>>>> Observed this issue when power resetting the module for about 500 times,
>>>> with journalctl
>>>> enabled, after around 500 power cycles the debug log fills up the nand
>>>> flash. When the
>>>> flash menory is about to full, the ubifs partation is un-mountable.
>>>>
>>>> The nand flash controller driver is under review and passed all MTD tests.
>>>> https://lkml.org/lkml/2015/6/18/847
>>>>
>>>>
>>>> Debug log during UBIFS mounting from U-Boot:
>>>>
>>>> U-Boot 2015.04 (May 18 2015 - 15:37:34)
>>>>
>>>> CPU: Freescale Vybrid VF500 at 396 MHz
>>>> Reset cause: POWER ON RESET
>>>> DRAM:  128 MiB
>>>> NAND:  128 MiB
>>>> MMC:   FSL_SDHC: 0
>>>> *** Warning - bad CRC, using default environment
>>>>
>>>> In:    serial
>>>> Out:   serial
>>>> Err:   serial
>>>> Model: Toradex Colibri VF50 128MB V1.1A, Serial# 04815679
>>>> Net:   FEC
>>>> Hit any key to stop autoboot:  0
>>>> Booting from NAND...
>>>> UBI: default fastmap pool size: 50
>>>> UBI: default fastmap WL pool size: 25
>>>> UBI: attaching mtd1 to ubi0
>>>> UBI: attached by fastmap
>>> Is this a recent kernel with all fastmap fixes applied?
>> I'm sorry! I didn't mention about the kernel version before.
>>
>> Tested with 4.0.5 kernel[1]. I think your fastmap fixes[2] are not available with
>> this kernel version.
>>
>> Lately also tested on 4.1.1 kernel[3], observed the same issues.
> I'm confused. Does this mean that you can _reproduce_ the issue from a clean
> working UBI image also with 4.1.1?
> Or does it mean that the already broken image does also not work with 4.1.1?

Reproduced the issue with a clean UBI image.

>
> Thanks,
> //richard
>
Best regards,
Bhuvan