UBIFS problem on MPC8536DS

[Felix Radensky <felix@embedded-sol.com>]

Hi,

I have a strange problem in linux-2.6.31 running on MPC8536DS board.
It is 100% reproducible, by opening a 350MB tar file into ubifs volume
on NAND flash, and starting erase of NOR flash partition right after that.

If I don't start  NOR erase, everything works fine. Also, If I run sync 
after
tar, no problem occurs.  The NOR flash is 32MB  Spansion, NAND is
4GB Samsung.

The error messages are as follows:

UBI error: ubi_io_write: error -5 while writing 2048 bytes to PEB 
5812:12288, written 0 bytes
UBI warning: ubi_eba_write_leb: failed to write data to PEB 5812
UBI: recover PEB 5812, move data to PEB 19400
UBI error: ubi_io_read: error -74 while reading 512 bytes from PEB 
5812:512, read 512 bytes
UBI error: ubi_io_write: error -5 while writing 512 bytes to PEB 
19400:512, written 0 bytes
UBI warning: recover_peb: failed to write to PEB 19400
UBI: try again
UBI: recover PEB 5812, move data to PEB 19401
UBI: run torture test for PEB 19400
UBI error: ubi_io_write: error -5 while writing 512 bytes to PEB 
19401:512, written 0 bytes
UBI warning: recover_peb: failed to write to PEB 19401
UBI: try again
UBI: recover PEB 5812, move data to PEB 19402
UBI error: ubi_io_write: error -5 while writing 512 bytes to PEB 
19402:512, written 0 bytes
UBI warning: recover_peb: failed to write to PEB 19402
UBI: try again
UBI: recover PEB 5812, move data to PEB 19403
UBI error: ubi_io_write: error -5 while writing 512 bytes to PEB 
19403:512, written 0 bytes
UBI warning: recover_peb: failed to write to PEB 19403
UBI warning: ubi_ro_mode: switch to read-only mode
UBIFS error (pid 1149): ubifs_wbuf_write_nolock: cannot write 2522 bytes 
to LEB 389:10240, error -5
UBIFS warning (pid 1149): ubifs_ro_mode: switched to read-only mode, 
error -5
UBIFS error (pid 1149): do_writepage: cannot write page 0 of inode 
30708, error -5
UBIFS error (pid 1149): make_reservation: cannot reserve 858 bytes in 
jhead 2, error -30
UBIFS error (pid 1149): do_writepage: cannot write page 2 of inode 
29486, error -30
UBIFS error (pid 1149): make_reservation: cannot reserve 721 bytes in 
jhead 2, error -30
UBIFS error (pid 1149): do_writepage: cannot write page 1 of inode 
30070, error -30
UBI error: ubi_io_write: error -5 while writing 2048 bytes to PEB 
5022:88064, written 0 bytes
UBI warning: ubi_eba_write_leb: failed to write data to PEB 5022
UBI: recover PEB 5022, move data to PEB 19404
UBI error: ubi_io_read: error -74 while reading 512 bytes from PEB 
5022:512, read 512 bytes
UBI error: ubi_io_write: read-only mode
UBI warning: recover_peb: failed to write to PEB 19404
UBI: try again
UBI: recover PEB 5022, move data to PEB 19405
UBI error: ubi_io_write: read-only mode
UBI warning: recover_peb: failed to write to PEB 19405
UBI: try again
UBI: recover PEB 5022, move data to PEB 19406
UBI error: ubi_io_write: read-only mode
UBI warning: recover_peb: failed to write to PEB 19406
UBI: try again
UBI: recover PEB 5022, move data to PEB 19407
UBI error: ubi_io_write: read-only mode
UBI warning: recover_peb: failed to write to PEB 19407
UBIFS error (pid 1044): ubifs_wbuf_sync_nolock: cannot write 2048 bytes 
to LEB 788:86016
UBIFS error (pid 1044): ubifs_bg_wbufs_sync: cannot sync write-buffer, 
error -30
UBIFS warning (pid 1044): ubifs_ro_mode: switched to read-only mode, 
error -30
UBI error: ubi_io_write: error -5 while writing 2048 bytes to PEB 
5817:26624, written 0 bytes
UBI warning: ubi_eba_write_leb: failed to write data to PEB 5817
UBI: recover PEB 5817, move data to PEB 19408
UBI error: ubi_io_read: error -74 while reading 512 bytes from PEB 
5817:512, read 512 bytes
UBI error: ubi_io_write: read-only mode
UBI warning: recover_peb: failed to write to PEB 19408
UBI: try again
UBI: recover PEB 5817, move data to PEB 19409
UBI error: ubi_io_write: read-only mode
UBI warning: recover_peb: failed to write to PEB 19409
UBI: try again
UBI: recover PEB 5817, move data to PEB 19410
UBI error: ubi_io_write: read-only mode
UBI warning: recover_peb: failed to write to PEB 19410
UBI: try again
UBI: recover PEB 5817, move data to PEB 19411
UBI error: ubi_io_write: read-only mode
UBI warning: recover_peb: failed to write to PEB 19411
UBIFS error (pid 1047): ubifs_wbuf_sync_nolock: cannot write 2048 bytes 
to LEB 385:24576
UBIFS error (pid 1047): ubifs_bg_wbufs_sync: cannot sync write-buffer, 
error -30
UBIFS error (pid 1149): make_reservation: cannot reserve 160 bytes in 
jhead 1, error -30
UBIFS error (pid 1149): ubifs_write_inode: can't write inode 30709, 
error -30
UBIFS error (pid 1149): make_reservation: cannot reserve 160 bytes in 
jhead 1, error -30
UBIFS error (pid 1149): ubifs_write_inode: can't write inode 30710, 
error -30
UBIFS error (pid 1149): make_reservation: cannot reserve 160 bytes in 
jhead 1, error -30
UBIFS error (pid 1149): ubifs_write_inode: can't write inode 30698, 
error -30
UBIFS error (pid 1149): make_reservation: cannot reserve 160 bytes in 
jhead 1, error -30
UBIFS error (pid 1149): ubifs_write_inode: can't write inode 30711, 
error -30

I'd appreciate any hints on what can cause this. Is it a hardware 
problem, mtd layer problem
or UBI problem ?

Thanks a lot in advance.

Felix.