Empty flash at ... / check_node_data: wrong data CRC

Empty flash at ... / check_node_data: wrong data CRC

[Arno Steffen]

I do have a system which is not used with a controlled shutdown, but
with a cold heartless poweroff only.

I am using a jffs2 filesystem as it should be journalling and robust
agains power loss.

But while boot I get  messages like:

Empty flash at 0x00963864 ends at 0x00964000

And after finishing boot:

[root@EEE ]# JFFS2 notice: (181) check_node_data: wrong data CRC in
data node at 0x01f8b55c: read 0xa7496669, calculated 0x5aea21d5.
JFFS2 notice: (181) check_node_data: wrong data CRC in data node at
0x01f88d3c: read 0xc5d341c, calculated 0x3f0d9534.

This sound seroius to me. How to prevent this if I can't use "halt" or
other controlled shutdown? 
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Re: Empty flash at ... / check_node_data: wrong data CRC

[Ricard Wanderlof]

On Mon, 4 Jan 2010, Arno Steffen wrote:

> I do have a system which is not used with a controlled shutdown, but
> with a cold heartless poweroff only.
>
> I am using a jffs2 filesystem as it should be journalling and robust
> agains power loss.
>
> But while boot I get  messages like:
>
> Empty flash at 0x00963864 ends at 0x00964000
>
> And after finishing boot:
>
> [root@EEE ]# JFFS2 notice: (181) check_node_data: wrong data CRC in
> data node at 0x01f8b55c: read 0xa7496669, calculated 0x5aea21d5.
> JFFS2 notice: (181) check_node_data: wrong data CRC in data node at
> 0x01f88d3c: read 0xc5d341c, calculated 0x3f0d9534.
>
> This sound seroius to me. How to prevent this if I can't use "halt" or
> other controlled shutdown?

On the surface of it, it looks alarming, but generally it isn't serious. See:
http://www.linux-mtd.infradead.org/faq/jffs2.html#L_messages .

In my own experience I get this question a lot, but so for no one has been 
able to show any ill effects such as files disappearing or getting 
mangled. That would be reason for worry.

/Ricard
-- 
Ricard Wolf Wanderlöf                           ricardw(at)axis.com
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