UBIFS Corrupt during power failure

[Artem Bityutskiy]

On Wed, 2009-06-03 at 07:50 -0600, Eric Holmberg wrote:
> Sorry for the delays on getting you real information - I am working on it as much as I can.  Due to our project schedule here, I can only work on this a few minutes a day.
> 
> I have reproduced the CRC error, but looking at the data (shown below), I am not sure what data is expected in LEB 1 at the failed position.  I don't see anything that indicates that the write-buffer behavior that I have avoided by limiting the write-buffer size to 8 bytes is causing the problem.
> 
> [42949375.500000] UBIFS error (pid 1): ubifs_check_node: bad CRC: calculated 0x714960f4, read 0x3dae4f0a
> [42949375.510000] UBIFS error (pid 1): ubifs_check_node: bad node at LEB 1:89600
> [42949375.520000] UBIFS error (pid 1): ubifs_scanned_corruption: corrupted data at LEB 1:89600
> [42949375.540000] UBIFS error (pid 1): ubifs_scan: LEB 1 scanning failed
> [42949375.580000] UBIFS error (pid 1): ubifs_recover_master_node: failed to recover master node
> 
> LEB 1:89600 refers to address 0x31c75e00 for the NOR flash and looks like it contains nothing but zeros.
> 
> 31c75e00: 00000000 00000000 00000000 00000000    ................
> 31c75e10: 00000000 00000000 00000000 00000000    ................
> 31c75e20: 00000000 00000000 00000000 00000000    ................
> 31c75e30: 00000000 00000000 00000000 00000000    ................
> 31c75e40: 00000000 00000000 00000000 00000000    ................
> 31c75e50: 00000000 00000000 00000000 00000000    ................
> 31c75e60: 00000000 00000000 00000000 00000000    ................
> 31c75e70: 00000000 00000000 00000000 00000000    ................
> 31c75e80: 06101831 3dae4f0a 000ecc9b 00000000    1....O.=........
> 
> Since this is the root file system and is 28MB in size, I am working on creating a smaller file system and writing a fixed test pattern to it.  I will provide the dd images of these files along with log files as soon as possible which will hopefully be next Monday (June 8).
> 
> If you have any addition suggestions or requests, please let me know.

Well, I would be cool to have full UBIFS debugging output, or better
the image of the partition.

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)