Похоже, в фиксе steal_locks к фиксу unshare_files нашли ещё баг :-( (vsu@ в devel-kernel@) ...
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as
ID Status Resolution Sev Product Comp Assignee Reporter Summary
38426 NEW --- nor Sisyphus alternat placeholder vle update-alternatives is true :-)

File a new bug in the "alternatives" component of the "Sisyphus" product