Re: Need help with btrfs.

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Chris,

I'm trying to re-create the "beyond end of disk" problem. I have nowhere near enough extra space to hold the image and tar file you've asked for AND, there's too much personal information for me for me to feel comfortable posting it publicly.

I'm converting a smaller drive now and see an error message "1234 [ 3341.845090] sdb: p1 size 1465144002 extends beyond EOD, enabling native capacity". Do you think this will cause the error condition from scrub that "we" are looking for? The sdb1 partition is smaller than "native capacity" by the way. Is this a problem?

Regards,

George...





On Friday, March 5, 2021, 3:51:14 PM PST, Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote: 





On Fri, Mar 5, 2021 at 10:39 AM Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote:
>
> Quick follow up on one thing I can't reproduce from George's scrub:
>
> [36365.549230] BTRFS error (device sda8): scrub: tree block
> 1777055424512 spanning stripes, ignored. logical=1777055367168
> [36365.549262] attempt to access beyond end of device
>                sda8: rw=0, want=3470811376, limit=3470811312
>
> I think this is just a benign artifact of the convert, and once the
> ext2_saved/image file is deleted, it will go away. I've asked upstream
> about it but I'm not sure when I'll hear back.

Ok Qu wants to see it. No need to file any bugs though. I'll just
track it upstream.

> mount -o ro,rescue=all /dev/sda8 /mnt/btrfs
> losetup -r /dev/loop1 /mnt/btrfs/ext2_saved/image
> e2image -Q /dev/loop1 /path/to/sda8ext4-e2image.bin
>
> I estimate the file could be around 700MB (maybe up to 2G). It can be
> compressed:
>
> tar -S -acf sda8ext4-e2image.bin.tar.gz sda8ext4-e2image.bin

And then upload the 'sda8ext4-e2image.bin.tar.gz' file some place
convenient like nextcloud, google drive, drop box, or equivalent.  A
user on #fedora recommended https://siasky.net/ but I don't know if
that can accept files as big as this will be.

Post the download URL here or email it offlist and I'll add it to the
upstream thread.


-- 
Chris Murphy
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