[Bug 1869281]

[kernel.20.drkshadow]

Created attachment 307802
Converted superblock dump

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Title:
  btrfs-convert of ext4 yields unmountable FS

Status in Btrfs Tools:
  Confirmed
Status in btrfs-progs package in Ubuntu:
  Confirmed

Bug description:
  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.

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