[regression] Bug 217042 - mdb_copy produces a corrupted database on btrfs

[Linux regression tracking #adding (Thorsten Leemhuis)]

[TLDR: Just adding a regression reported to bko to the tracking]

I noticed a regression reported in bugzilla.kernel.org that seems to be
handled there already, nevertheless I'd like to add to the tracking to
ensure it's doesn't fall through the cracks in the end:

#regzbot introduced: 51bd9563b6783
https://bugzilla.kernel.org/show_bug.cgi?id=217042
#regzbot title: btrfs: mdb_copy produces a corrupted database
#regzbot ignore-activity

See the ticket for details, there were a few replies already.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
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