On Sun, Mar 03, 2013 at 06:57:41AM -0700, Michael Schmitt wrote:
> Hi list,
> 
> some rather unexpected btrfs-oopses for my taste. I use btrfs for some
> time now (mostly on external harddisks) and these "oopses" happened
> during some simple file and folder deletion operation on that device. It
> is a luks-encrypted 80GB drive. Anything like that known? And the fs was
> created just yesterday, how come there is a message like...
> 
> [91491.919358] btrfs: mismatching generation and generation_v2 found in root 
> item. This root was probably mounted with an older kernel. Resetting all new 
> fields.

This may be from first mount after mkfs.  It depends on your tools.

> 
> ... but the kernel used (3.7.3 from Debian experimental on Debian sid)
> was installed several days ago. What kind of oopses are these? As of now
> there is no real data on that device. But if there were, would I need to
> be concerned about the integrity of those files?
>
> [93283.762006] WARNING: at 
> /build/buildd-linux_3.7.3-1~experimental.1-i386-eX5kUQ/linux-3.7.3/fs/btrfs/extent-tree.c:6297
>  btrfs_alloc_free_block+0xcd/0x2a4 [btrfs]()

These are not oopsen but warnings.  It's an ENOSPC warning as we try to
delete the extents.  It did happen sometimes in this kernel, but it is
only a warning.

-chris
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