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[Marko Mäkelä <marko.makela@xxxxxxxxxxx>]

I wonder if this could be caused by missing MDL protection around TRUNCATE
TABLE, which would then incorrectly allow concurrent INSERT and TRUNCATE.
One place where MDL is definitely missing is DROP DATABASE (reported as
MDEV-11342 <https://jira.mariadb.org/browse/MDEV-11342>).

That said, the InnoDB in MariaDB 10.2 is based on MySQL 5.7, and one
difference between MySQL 5.6 and 5.7 is that InnoDB supports crash-safe
atomic TRUNCATE TABLE for .ibd files (WL#6501
<http://dev.mysql.com/worklog/task/?id=6501>).

Best regards,

Marko
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Marko Mäkelä, Lead Developer InnoDB
MariaDB Corporation