UBI/UBFS: ubi_eba_read_leb() reporting unmapped LEB

[Steve B]

Hi,

Can anyone help me with this?

Thanks,
Steve

On Fri, 10 Oct 2014, Steve B wrote:

> Hi All,
>
> I've been running a reboot test on 5 devices and after about 7000 reboot 
> files in
> one of our UBIFS volumes reports a corruption (SQUASHFS errors). I have been
> able to extract the mtd partition and pull it into a nandsim instance on my 
> host
> machine so I can add some extra debug. Here's the error log when trying to 
> load
> the file:
>
> [41308.683356] UBI DBG gen (pid 15044): read 4062 bytes from LEB 1:352:0
> [41308.683358] UBI DBG eba (pid 15044): read 4062 bytes from offset 0 of LEB 
> 1:352 (unmapped)
> [41308.683362] UBI DBG gen (pid 15044): read 4062 bytes from LEB 1:352:0
> [41308.683364] UBI DBG eba (pid 15044): read 4062 bytes from offset 0 of LEB 
> 1:352 (unmapped)
> [41308.683368] UBIFS error (pid 15044): ubifs_read_node: bad node type (255 
> but expected 1)
> [41308.683373] UBI DBG gen (pid 15044): test LEB 1:352
> [41308.683377] UBIFS error (pid 15044): ubifs_read_node: bad node at LEB 
> 352:0, LEB mapping status 0
> [41308.683381] Not a node, first 24 bytes:
> [41308.683386] 00000000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 
> ff ff ff ff ff ff ff                          ........................
> [41308.683392] Pid: 15044, comm: md5sum Tainted: GF          O 
> 3.8.0-29-generic #42~precise1-Ubuntu
> [41308.683396] Call Trace:
> [41308.683411]  [<ffffffffa0564a7d>] ubifs_read_node+0x26d/0x2d0 [ubifs]
> [41308.683419]  [<ffffffffa0583338>] ubifs_tnc_read_node+0x148/0x160 [ubifs]
> [41308.683426]  [<ffffffffa056816c>] ubifs_tnc_locate+0x1cc/0x1f0 [ubifs]
> [41308.683431]  [<ffffffffa0559ade>] do_readpage+0x10e/0x410 [ubifs]
> [41308.683437]  [<ffffffffa055a4ce>] ubifs_readpage+0x5e/0x580 [ubifs]
> [41308.683441]  [<ffffffff81152de3>] ? __inc_zone_page_state+0x33/0x40
> [41308.683444]  [<ffffffff81135866>] ? 
> add_to_page_cache_locked.part.26+0x76/0xd0
> [41308.683447]  [<ffffffff8113593d>] ? add_to_page_cache_locked+0x7d/0x90
> [41308.683452]  [<ffffffff81135edd>] 
> do_generic_file_read.constprop.31+0x10d/0x440
> [41308.683460]  [<ffffffff81136f01>] generic_file_aio_read+0xe1/0x220
> [41308.683469]  [<ffffffff8119b0c3>] do_sync_read+0xa3/0xe0
> [41308.683477]  [<ffffffff8119b800>] vfs_read+0xb0/0x180
> [41308.683485]  [<ffffffff8119b922>] sys_read+0x52/0xa0
> [41308.683492]  [<ffffffff816fc8dd>] system_call_fastpath+0x1a/0x1f
>
> I have written a small tool to scan the headers in all PEBs and this confirms
> that LEB 352 doesn't exist for this volume.
>
> We are running a Linux kernel based off 3.4.0
>
> This issue seems similar to an issue already raised on this mailing list:
> linux-mtd/2010-September/031837.html
> subject: ubi_eba_init_scan: cannot reserve enough PEBs
>
> I would like to know the best way to debug this issue, does anyone have the 
> patch
> mentioned in the issue above to add more debugging in the right places?
>
> Our test setup has the facility of pulling the power on the unit if a GPIO 
> line
> is toggled, with this we can test sensitive areas of the code, can anyone 
> suggest
> where would be a good place to perform this action.
>
> Thanks for any help on this,
> Steve B
>
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