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Date:	Sat, 8 Nov 2008 19:30:02 +0000
From:	"Roc Valles" <>
To:	"Theodore Tso" <>
Subject: Re: EXT4-fs error (device sda3): ext4_mb_generate_buddy: EXT4-fs: group 923: 18046 blocks in bitmap, 32768 in gd

> Hmm... is there any chance that a rtorrent was in the middle of
> downloading a file at the time when you shutdown the system?  If so,
> try killing all processes which might be writing to the filesystem
> (especially any rtorrent processes) before shutting down the
> filesystem.
Zero. I carefully quit rtorrent everytime I reboot, including this
one. If I ever forget to, I'll notice right away the moment I start
it, because it'd rehash everything.

I forgot to menction something that might be key, which is that a few
reboots ago, I couldn't reboot (reboot wouldn't finish) until I forced
it with with -f and another parameter which makes reboot not sync
before rebooting. Doing a sync in another terminal never finished, so
the FS got stuck somehow. The error might have started appearing
immediatly after that.

> Another question is whether mounting -o nodelalloc (on the previous
> boot session) makes the problem go away.  These last two tries are
> based on the assumption that the filesystem is somehow really getting
> corrupted on shutdown, and since you have errors=continue, it's
> getting silently fixed up in mballoc.c, and so it doesn't show up when
> you unmount the filesystem and run e2fsck.  If this assumption is
> true, that bogus free blocks in the superblock should show up in the
> dumpe2fs, and it should also show up when you reboot via a rescue disk
> and run "e2fsck -nfv /dev/sda3".

I'll do the later at next opportunity, also the other thing we discussed on irc.

>                                                        - Ted
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