On Jul 4, 2014, at 11:21 AM, Pavel Machek <pavel@ucw.cz> wrote:
>>> pavel@duo:~$ uname -a
>>> Linux duo 3.15.0-rc8+ #365 SMP Mon Jun 9 09:18:29 CEST 2014 i686
>>> GNU/Linux
>>> 
>>> EXT4-fs (sda3): error count: 11
>>> EXT4-fs (sda3): initial error at 1401714179: ext4_mb_generate_buddy:756
>>> EXT4-fs (sda3): last error at 1401714179: ext4_reserve_inode_write:4877
>>> 
>>> That sounds like media error to me?
>> 
>> If you search your system logs since the last fsck, you should find 11
>> instances of "EXT4-fs error" message, which means that there was some
>> file system inconsisntencies detected.  The first error was detected at:
>> 
>> % date -d @1401714179
>> Mon Jun  2 09:02:59 EDT 2014
> 
> Interesting. I always assumed 140... was block number.

Maybe it is worthwhile to improve this error message to be:

    EXT4-fs (sda3): initial error at time 1401714179: ...

Cheers, Andreas