Currently several places use description_event->common_header_len instead of LOG_EVENT_MINIMAL_HEADER_LEN when parsing events with "frozen" headers (such as Start_event_v3 and its subclasses such as Format_description_log_event, as well as Rotate_event). This causes events with extra headers (which would otherwise be valid and those headers ignored) to be corrupted due to over-reading or skipping into the data portion of the log events.
Patch is forthcoming.
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Bug
Major
serg: The patches attached to this ticket (mdev_4645.patch, mdev_4645_2.patch, mdev_4645_3.patch) are provided under the "New BSD" License by Google Inc.