MySQL 5.7.38 includes the following InnoDB changes:
BUG #33459653 : coredump after add index for partion table with ibd file missing
The included test case produces an error HA_ERR_TABLESPACE_MISSING from ha_innobase::open() for the missing data file of the partition.
The code fix is for the refactored MySQL 5.7 “native partitioning” (ha_innopart), which never existed in MariaDB Server.
Bug #33600109 Segmentation fault at ha_innobase::index_type, Improper code handling
MDEV-22928. No test case is included.
BUG #32586721 : SERVER CRASH IN FIL_SPACE_IS_BEING_TRUNCATED
The affected function fil_space_is_being_truncated() (which performs a redundant tablespace lookup) was removed from MariaDB as part of a fix of
MDEV-11202. The test case involves encrypted tablespaces, which Oracle implemented in MySQL 5.7 differently in response to MariaDB Server 10.1.