ubi volume unmountable after power cut

[Eric Millbrandt]

> -----Original Message-----
> From: Artem Bityutskiy [mailto:dedekind1 at gmail.com]
> Sent: Friday, August 19, 2011 08:12
> To: Eric Millbrandt
> Cc: 'linux-mtd at lists.infradead.org'
> Subject: Re: ubi volume unmountable after power cut
>
> On Wed, 2011-08-10 at 15:46 -0400, Eric Millbrandt wrote:
> > All,
> >
> > One of our systems came back "unbootable" from our QA department.
> > When I took a look at the system I found that the rootfs, which is a
> > ubi/ubifs filesystem, had become corrupt.  My QA department swears
> > that they powered off the system correctly, but even so, shouldn't
> ubi
> > be tolerant of power cuts?  I've attached all the relevant
> information
> > below.
> >
> > # uname -r
> > 2.6.33.7-rt29-deka-debug
>
> I strongly recommend you to pull in changes from the UBIFS back-port
> trees.
>
I have since applied the back-ports to my kernel, unfortunately the
system is still unable to mount the partition.


> > [  140.482974] UBI error: ubi_io_read: error -74 while reading 516096
> > bytes from PEB 3889:8192, read 516096 bytes
> > [  140.494658] Call Trace:
> > [  140.497406] [cf86fac0] [c00097bc] show_stack+0x4c/0x16c
> > (unreliable)
> > [  140.504881] [cf86fb00] [c031f298] ubi_io_read+0x170/0x28c
> > [  140.511141] [cf86fb40] [c031e4a8] ubi_eba_read_leb+0x13c/0x36c
> > [  140.517961] [cf86fb80] [c031c7bc] ubi_leb_read+0x120/0x170
> > [  140.524329] [cf86fbb0] [c01edd64] ubifs_start_scan+0xb8/0x1e8
> > [  140.531053] [cf86fbe0] [c0205820] ubifs_recover_leb+0x68/0xa78
> > [  140.537876] [cf86fc50] [c01eead0] replay_buds+0xa8/0xcf4
> > [  140.544052] [cf86fcf0] [c01f0018]
> ubifs_replay_journal+0x8fc/0x1284
> > [  140.551315] [cf86fd80] [c01e1268] ubifs_fill_super+0xf20/0x1928
> > [  140.558225] [cf86fde0] [c01e2638] ubifs_get_sb+0x104/0x384
> > [  140.564702] [cf86fe60] [c00c8d18] vfs_kern_mount+0x70/0x190
> > [  140.571142] [cf86fe90] [c00c8e88] do_kern_mount+0x40/0x100
> > [  140.577501] [cf86feb0] [c00e3030] do_mount+0x4d8/0x828
> > [  140.583497] [cf86ff10] [c00e3410] sys_mount+0x90/0xd0
> > [  140.589399] [cf86ff40] [c0012f2c] ret_from_syscall+0x0/0x38
> > [  140.595950] --- Exception: c01 at 0xfdd64c8
> > [  140.595964]     LR = 0x10063dd8
> > [  140.606215] UBIFS error (pid 361): ubifs_recover_leb: garbage
> > [  140.612939] UBIFS error (pid 361): ubifs_scanned_corruption:
> > corruption at LEB 3211:335872
> > [  140.622385] UBIFS error (pid 361): ubifs_scanned_corruption: first
> > 8192 bytes from LEB 3211:335872
> > [  140.646492] UBIFS error (pid 361): ubifs_recover_leb: LEB 3211
> > scanning failed
>
> Please, produce the issue and send all messages, not only error
> messages
> which you see on your console. E.g, send dmesg output. It is difficult
> to say anything without the full log which should contain flash dump.
>
The full dmesg output can be seen here, http://pastebin.com/Rg1Lcc6U.

Thanks
Eric Millbrandt

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