Re: nilfs error

[Ryusuke Konishi <ryusuke-sG5X7nlA6pw@public.gmane.org>]

Hi,
On Sun, 19 Sep 2010 07:36:56 +0200, David Arendt wrote:
>   Hi,
> 
> yesterday I had the following error:
> 
> Sep 18 18:03:24 server kernel: NILFS: bad btree node 
> (blocknr=226497086): level
> = 37, flags = 0x18, nchildren = 22092
> Sep 18 18:03:24 server kernel: NILFS error (device sdb1): 
> nilfs_truncate_bmap: b
> map is broken (ino=69)
> Sep 18 18:03:24 server kernel: Remounting filesystem read-only
> Sep 18 18:03:24 server kernel: nilfs_palloc_commit_free_entry: entry 
> number 69 already freed
> 
> Remounting the filesytem worked correctly. What could be the cause of 
> this error ?

Thank you for the report.

According to the log, nilfs detected btree corruption during file
deletion; the message "bad btree node ..." shows a btree node block
that nilfs read was broken.

One possible cause is garbage collection, or there may be a problem
with exclusion control on delete operation.  Or, the block might be
actually broken if the underlying device is not reliable.


Do you think nilfs_cleanerd worked before this trouble?

How much free space was left on the device?

> Should I preventively reformat the disk and recreate the 
> filesystem ?

Yes, it's recommended for safety.  If you haven't yet reformatted the
device, try the following command for sanity check.

 # find /mount-dir -type f -exec cat {} \; >/dev/null


Regards,
Ryusuke Konishi
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