ubifs_recover_master_node: failed to recover master node

[Chris Packham]

On 29/10/24 13:38, Chris Packham wrote:
> (resend as plaintext)
>
> Hi,
>
> I recently added support for the SPI-NAND controller on the RTL9302C 
> SoC[1]. I did most of the work against Linux 6.11 and it's working 
> fine there. I recently rebased against the tip of Linus's tree 
> (6.12-rc5) and found I was getting ubifs errors when mounting:
>
> [    1.255191] spi-nand spi1.0: Macronix SPI NAND was found.
> [    1.261283] spi-nand spi1.0: 256 MiB, block size: 128 KiB, page 
> size: 2048, OOB size: 64
> [    1.271134] 2 fixed-partitions partitions found on MTD device spi1.0
> [    1.278247] Creating 2 MTD partitions on "spi1.0":
> [    1.283631] 0x000000000000-0x00000f000000 : "user"
> [   20.481108] 0x00000f000000-0x000010000000 : "Reserved"
> [   72.240347] ubi0: scanning is finished
> [   72.270577] ubi0: attached mtd3 (name "user", size 240 MiB)
> [   72.276815] ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 
> 126976 bytes
> [   72.284537] ubi0: min./max. I/O unit sizes: 2048/2048, sub-page 
> size 2048
> [   72.292132] ubi0: VID header offset: 2048 (aligned 2048), data 
> offset: 4096
> [   72.299885] ubi0: good PEBs: 1920, bad PEBs: 0, corrupted PEBs: 0
> [   72.306689] ubi0: user volume: 1, internal volumes: 1, max. volumes 
> count: 128
> [   72.314747] ubi0: max/mean erase counter: 1/0, WL threshold: 4096, 
> image sequence number: 252642230
> [   72.324850] ubi0: available PEBs: 0, total reserved PEBs: 1920, 
> PEBs reserved for bad PEB handling: 40
> [   72.370123] ubi0: background thread "ubi_bgt0d" started, PID 141
> [   72.470740] UBIFS (ubi0:0): Mounting in unauthenticated mode
> [   72.490246] UBIFS (ubi0:0): background thread "ubifs_bgt0_0" 
> started, PID 144
> [   72.528272] UBIFS error (ubi0:0 pid 143): 
> ubifs_recover_master_node: failed to recover master node
> [   72.550122] UBIFS (ubi0:0): background thread "ubifs_bgt0_0" stops
> [   72.710720] UBIFS (ubi0:0): Mounting in unauthenticated mode
> [   72.717447] UBIFS (ubi0:0): background thread "ubifs_bgt0_0" 
> started, PID 149
> [   72.777602] UBIFS error (ubi0:0 pid 148): 
> ubifs_recover_master_node: failed to recover master node
> [   72.787792] UBIFS (ubi0:0): background thread "ubifs_bgt0_0" stops
>
> Full dmesg output is at[2]
>
> git bisect lead me to commit 11813857864f ("mtd: spi-nand: macronix: 
> Continuous read support"). Reverting the blamed commit from 6.12-rc5 
> seems to avoid the problem. The flash chip on my board is a 
> MX30LF2G28AD-TI. I'm not sure if there is a problem with 11813857864f 
> or with my spi-mem driver that is exposed after support for continuous 
> read is enabled.
>
A bit of an update. The ubifs failure is from the is_empty() check in 
get_master_node(). It looks like portions of the LEB are 0 instead of 
0xff. I've also found if I avoid use the non-DMA path in my driver I 
don't have such a problem. I think there is at least one problem in my 
driver because I don't handle DMAing more than 0xffff bytes.


> Thanks,
> Chris
>
> -- 
>
> [1] - 
> https://lore.kernel.org/all/20241015225434.3970360-1-chris.packham@alliedtelesis.co.nz/
> [2] - 
> https://gist.github.com/cpackham-atlnz/66a0843362e8f8eb2c4f5c7ed01c5efe
>