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Re: kernel BUG at fs/btrfs/volumes.c:2733



Hello Josef,

Josef Bacik wrote (ao):
> On Thu, Mar 29, 2012 at 12:52:35PM +0200, Sander wrote:
> > I can't seem to balance my btrfs filesystem. It segfaults, and gives a
> > kernel bug:
> > 
> > [ 1355.139099] ------------[ cut here ]------------
> > [ 1355.139099] kernel BUG at fs/btrfs/volumes.c:2733!
> > [ 1355.149322] Internal error: Oops - BUG: 0 [#1] SMP
> > [ 1355.149322] Modules linked in:
> > [ 1355.154479] CPU: 0    Not tainted  (3.3.0 #8)
> > [ 1355.162109] PC is at btrfs_balance+0x312/0xb04
> > [ 1355.166778] LR is at btrfs_run_delayed_iputs+0x2d/0xac

> > The system is a pandaboard running a plain Linus kernel 3.3.0 with a
> > btrfs filesystem, over two Intel 320 600GB ssd's, connected via usb (on
> > an usb hub), on top of md_crypt. Mount options:
> > "subvol=rootvolume,space_cache,inode_cache,compress=lzo,ssd"
> > 
> > Before the balance, I deleted about 2500 snapshots and waited for the
> > btrfs kernel threads to calm down. Then I initiated a btrfs filesystem
> > scrub. Unfortunately during the scrub, the filesystem balance started.
> > Might be related.
> 
> Well that's kind of cool.  So 2 options
> 
> 1) If you are in a hurry and need this stuff back right away run btrfs fi
> balance resume / and it should work, buuutt
> 
> 2) If you aren't in a hurry I'd really like to try and reproduce this locally
> and if I can't I'd like to be able to send you patches to help me figure out how
> to fix this problem.

I am in no hurry at all. The filesystem seems just fine the way it is
(after a reboot), so there is no "stuff to get back right away". Does
the kernel bug suggest the filesystem is fubar?

I'll keep the filesystem as is (no resume) and am happy to test any
patches you have.

	Sander

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