linux-kernel - Re: EXT4-fs error w/ external USB drive

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Date:	Mon, 22 Oct 2012 20:36:47 +0200
From:	Toralf Förster <toralf.foerster@....de>
To:	Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: EXT4-fs error w/ external USB drive

On 10/19/2012 11:07 PM, Theodore Ts'o wrote:
> On Mon, Oct 15, 2012 at 07:46:02PM +0200, Toralf Förster wrote:
>> Even with current stable kernel 3.6.2 I sometimes get those syslog messages :
>>
>>
>> 2012-10-15T19:37:58.401+02:00 n22 kernel: EXT4-fs error (device sdb3): ext4_mb_generate_buddy:741: group 436, 22902 clusters in bitmap, 22901 in gd
> 
> Have you run e2fsck to clean up the file system corruption?  If you
> have, do you continually get these errors afterwards?

Well, I got it yesterday too :

n22 ~ # zgrep  ext4_mb_generate_buddy /var/log/messages-201210*                                                                                                                       
/var/log/messages-20121021.gz:2012-10-15T19:05:39.189+02:00 n22 kernel: EXT4-fs error (device sdb3): ext4_mb_generate_buddy:741: group 774, 27157 clusters in bitmap, 27052 in gd       
/var/log/messages-20121021.gz:2012-10-15T19:37:58.401+02:00 n22 kernel: EXT4-fs error (device sdb3): ext4_mb_generate_buddy:741: group 436, 22902 clusters in bitmap, 22901 in gd       
/var/log/messages-20121021.gz:2012-10-15T19:56:05.301+02:00 n22 kernel: EXT4-fs error (device sdb3): ext4_mb_generate_buddy:741: group 1233, 11981 clusters in bitmap, 11974 in gd      
/var/log/messages-20121021.gz:2012-10-15T19:56:18.601+02:00 n22 kernel: EXT4-fs error (device sdb3): ext4_mb_generate_buddy:741: group 484, 28817 clusters in bitmap, 28101 in gd      

I rebooted the system and forced a run of fsck after these lines too.
I'll check periodically whether it happens again.
 
> You say this is an external USB disk; is there any possibility of the
> disk getting unmounted uncleanly due to the cable getting pulled out
> while the disk is still mounted, and then the disk getting remounted
> w/o having e2fsck run on the disk?

For the first occurrence probably yes (better : I dunno), but yesterday definitely not.



-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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