From: Ilya Shestopalov <yast4ik@yahoo.com>
Subject: Re: Re: Segmentation fault on partition mount
Date: Fri, 30 Apr 2010 12:23:49 -0700 (PDT)
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Cc: linux-btrfs@vger.kernel.org
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> > My distro: Archlinux
> > Kernel: 2.6.34-rc5, 2.6.33.3
> > I has 522 Gib btrfs partition and. While I was
> checking out chromium source, free space on my /home btrfs
> partition was about 20 Gib. Then I received message "not
> enough free space" (but there was enough of it). And even
> after btrfsck I always get segmentation fault. Even
> btrfs-debug-tree can't be done successfully.
> > How can this bug be fixed?
> > 
> > P.S. 
> > 
> > I can't find btrfs-image in btrfs-progs-unstable from
> the Archlinux repo.
> > 
> 
> So you may have run out of metadata space.  If you run
> btrfs filesystem df
> /mnt/point it will tell you the block groups and how much
> space is in them.  You
> may want to do a btrfs-vol -b /mnt/point.  Thanks,
> 
> Josef
>

The situation is that I CAN'T MOUNT (I always get segmentation fault), consequently don't have mount point to run btrfs filesystem df.
btrfs filesystem balance /dev/sda5 gives result
ERROR: balancing '/dev/sda5';
btrfs-vol -b /home gives folloving output:
ioctl returns -1