https://bugs.openldap.org/show_bug.cgi?id=9360
--- Comment #6 from Howard Chu hyc@openldap.org --- (In reply to Nate Graham from comment #5)
We are seeing this in KDE's baloo file indexer running on a variety of Linux-based OSs. See https://bugs.kde.org/show_bug.cgi?id=422008 for more details.
Just for the record, the problem with baloo is in ITS#9378 and was of their own making, they were deleting LMDB's lockfile while other processes were still writing to the DB. Obviously you must not delete a database's lockfile while the DB is in use. Doesn't seem directly relevant to this ticket unless their scripts are doing this too.