Re: "bad tree block start" when trying to mount on ARM

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

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On 2019/5/21 下午4:34, Erik Jensen wrote:
> I have a 5-drive btrfs filesystem. (raid-5 data, dup metadata). I can
> mount it fine on my x86_64 system, and running `btrfs check` there
> reveals no errors. However, I am not able to mount the filesystem on
> my 32-bit ARM board, which I am hoping to use for lower-power file
> serving. dmesg shows the following:

Have you ever tried btrfs check on the arm board?

I have an odroid C2 board at hand, but never tried armhf build on it,
only tried aarch64.
It may be an interesting adventure.

Thanks,
Qu

> 
> [   83.066301] BTRFS info (device dm-3): disk space caching is enabled
> [   83.072817] BTRFS info (device dm-3): has skinny extents
> [   83.553973] BTRFS error (device dm-3): bad tree block start, want
> 17628726968320 have 396461950000496896
> [   83.554089] BTRFS error (device dm-3): bad tree block start, want
> 17628727001088 have 5606876608493751477
> [   83.601176] BTRFS error (device dm-3): bad tree block start, want
> 17628727001088 have 5606876608493751477
> [   83.610811] BTRFS error (device dm-3): failed to verify dev extents
> against chunks: -5
> [   83.639058] BTRFS error (device dm-3): open_ctree failed
> 
> Is this expected to work? I did notice that there are gotchas on the
> wiki related to filesystems over 8TiB on 32-bit systems, but it
> sounded like they were mostly related to running the tools, as opposed
> to the filesystem driver itself. (Each of the five drives is
> 8TB/7.28TiB)
> 
> If this isn't expected, what should I do to help track down the issue?
> 
> Also potentially relevant: The x86_64 system is currently running
> 4.19.27, while the ARM system is running 5.1.3.
> 
> Finally, just in case it's relevant, I just finished reencrypting the
> array, which involved doing a `btrfs replace` on each device in the
> array.
> 
> Any pointers would be appreciated.
> 
> Thanks.
> 


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