Public bug reported:

This is with btrfs-progs 5.4.1-2 in focal.  Similar result with
5.2.1-1ubuntu1 in eoan.

Following conversion, both mount and btrfs check report an extent that
reached beyond the end of the device:

ERROR: dev extent devid 1 physical offset 126701535232 len 33554432 is
beyond device boudnary 126726701056

I was doing this booted from a live USB image, so I only have pictures
of the screen, which I will attach.

I used -d to speed up creation of the ext2 image, but it also happens
without -d.

** Affects: btrfs-progs (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "IMG_3182.jpg"
   
https://bugs.launchpad.net/bugs/1869281/+attachment/5341940/+files/IMG_3182.jpg

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https://bugs.launchpad.net/bugs/1869281

Title:
  btrfs-convert of ext4 yields unmountable FS

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