MariaDB Server 10.4 through 10.5., 10.6 through 10.6., 10.7 through 10.11., and 11.0 through 11.0. can sometimes crash with an empty backtrace log. This may be related to make_aggr_tables_info and optimize_stage2.
The product uses a mechanism that automatically optimizes code, e.g. to improve a characteristic such as performance, but the optimizations can have an unintended side effect that might violate an intended security assumption.