Mounting UBIFS fails intermittently

Mounting UBIFS fails intermittently

[Manish Jain]

Hello All,

In our system , we have created two partition in Nand flash. One is mounted as root and the other(which is quite big)is mounted for keeping data.
The problem is that data mount fails intermittently.

Here is the kernel error log, when we try to mount ubifs.

 error (pid 303): ubifs_scan: corrupt empty space at LEB 1:4160
UBIFS error (pid 303): ubifs_scanned_corruption: corrupted data at LEB 1:4160
00000000: 49269565 00000000 49269553 00000000 00000000 00000000 00000000 00000002  e.&I....S.&I....................
00000020: 00000000 00000000 000041fd 00000000 00000000 00000000 00000000 00000000  .........A......................
00000040: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000  ................................
00000060: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff  ................................
00000080: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff  ................................
000000a0: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff  ................................
 ...
 ...
00000fa0: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff  ................................
00000fc0: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff  ................................
00000fe0: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff  ................................
UBIFS error (pid 303): ubifs_scan: LEB 1 scanning failed
UBIFS error (pid 303): ubifs_recover_master_node: failed to recover master node

Kind Regards,
Manish
Reply

Re: Mounting UBIFS fails intermittently

[Artem Bityutskiy]

On Wed, 2008-12-10 at 12:27 +0000, Manish Jain wrote:
> Hello All,
> 
> In our system , we have created two partition in Nand flash. One is mounted as root and the other(which is quite big)is mounted for keeping data.
> The problem is that data mount fails intermittently.
> 
> Here is the kernel error log, when we try to mount ubifs.

I saw huge amount of e-mails like this, but for JFFS2. In most of the
cases the reporters had one of:
1. flash problems - the driver or HW was broken
2. flashed images incorrectly

Please, check these 2 cases. To check the first ones, please use
mtd-tests git repository:
git://git.infradead.org/users/dedekind/mtd-tests-2.6.git
(http://git.infradead.org/users/dedekind/mtd-tests-2.6.git)

The tests are not in main-line so far, so you have to take the 8 patches
from the above git tree, apply them to your tree, enable the tests and
compile.

The tests are kernel modules. Please, make sure they work without errors
for you. Note, be careful with the torture test - either do not run it
or realize what it is doing before running.

Vs. the second possible issue - just describe how you flash your UBIFS
image to your "data" partition, if you do this at all.

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)

RE: Mounting UBIFS fails intermittently

[Manish Jain]

Thanks Artem.

I'll try tests for case 1.

With respect to case2:

Within our flash, we have two partitions. And there is singe image of flash contents(namely er.ubi).
We flash our file image using ubiformat command.:

Ubiformat /dev/mtd5 -y -s 512 -f /CFCard/er.ubi

Though this problem is intermittent, but it is more likely to happen when we re-format mtd device.

Kind Regards,
Manish



-----Original Message-----
From: Artem Bityutskiy [mailto:dedekind@infradead.org] 
Sent: 10 December 2008 13:00
To: Manish Jain
Cc: linux-mtd@lists.infradead.org
Subject: Re: Mounting UBIFS fails intermittently

On Wed, 2008-12-10 at 12:27 +0000, Manish Jain wrote:
> Hello All,
> 
> In our system , we have created two partition in Nand flash. One is mounted as root and the other(which is quite big)is mounted for keeping data.
> The problem is that data mount fails intermittently.
> 
> Here is the kernel error log, when we try to mount ubifs.

I saw huge amount of e-mails like this, but for JFFS2. In most of the
cases the reporters had one of:
1. flash problems - the driver or HW was broken
2. flashed images incorrectly

Please, check these 2 cases. To check the first ones, please use
mtd-tests git repository:
git://git.infradead.org/users/dedekind/mtd-tests-2.6.git
(http://git.infradead.org/users/dedekind/mtd-tests-2.6.git)

The tests are not in main-line so far, so you have to take the 8 patches
from the above git tree, apply them to your tree, enable the tests and
compile.

The tests are kernel modules. Please, make sure they work without errors
for you. Note, be careful with the torture test - either do not run it
or realize what it is doing before running.

Vs. the second possible issue - just describe how you flash your UBIFS
image to your "data" partition, if you do this at all.

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)

RE: Mounting UBIFS fails intermittently

[Artem Bityutskiy]

On Wed, 2008-12-10 at 13:12 +0000, Manish Jain wrote:
> Thanks Artem.
> 
> I'll try tests for case 1.
> 
> With respect to case2:
> 
> Within our flash, we have two partitions. And there is singe image of flash contents(namely er.ubi).
> We flash our file image using ubiformat command.:
> 
> Ubiformat /dev/mtd5 -y -s 512 -f /CFCard/er.ubi

well, providing your sub-page size is really 512 bytes, this should be
doing the right things. Although I do not utilize ubiformat myself, so I
am not 100% sure it does not have bugs which may lead to what you see.

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)

RE: Mounting UBIFS fails intermittently

[Manish Jain]

Can you please suggest any alternate to ubiformat, I would like to try that out.

Kind Regards,
Manish

-----Original Message-----
From: Artem Bityutskiy [mailto:dedekind@infradead.org] 
Sent: 10 December 2008 13:32
To: Manish Jain
Cc: linux-mtd@lists.infradead.org
Subject: RE: Mounting UBIFS fails intermittently

On Wed, 2008-12-10 at 13:12 +0000, Manish Jain wrote:
> Thanks Artem.
> 
> I'll try tests for case 1.
> 
> With respect to case2:
> 
> Within our flash, we have two partitions. And there is singe image of flash contents(namely er.ubi).
> We flash our file image using ubiformat command.:
> 
> Ubiformat /dev/mtd5 -y -s 512 -f /CFCard/er.ubi

well, providing your sub-page size is really 512 bytes, this should be
doing the right things. Although I do not utilize ubiformat myself, so I
am not 100% sure it does not have bugs which may lead to what you see.

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)

RE: Mounting UBIFS fails intermittently

[Artem Bityutskiy]

On Wed, 2008-12-10 at 13:39 +0000, Manish Jain wrote:
> Can you please suggest any alternate to ubiformat, I would like to try that out.

Well, ubiformat is kind of the right solution, because it preserves
erase counters.

But you may try nandwrite which is available in mtd-utils. It destroys
erase counters, but it is OK if you are developing.

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)