Comment 2 for bug 1847340

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dann frazier (dannf) wrote : Re: ext4 journal recovery fails w/ data=journal + journal_checksum + mmap

And the precursor to that the upstream thread in comment #1:
  https://www.spinics.net/lists/linux-fsdevel/msg151486.html

And here's a captured filesystem image (referenced in above thread):
  https://people.canonical.com/~dannf/md2.e2ic.qcow2