looks like unresolved deadlock. Most of these tests timeout and stack traces are in lock/condition wait.

No stack traces in innodb or aria engines.

Failing test(s): main.group_by (sig 10)
main.func_like (sig 10)
main.group_by_null (sig 10)
main.func_str (sig 10)
main.features (sig 10)
main.sp-innodb

main.drop 'innodb' - handle in MDEV-24214

source:

https://buildd.debian.org/status/fetch.php?pkg=mariadb-10.5&arch=sparc64&ver=1%3A10.5.8-1&stamp=1605408327&raw=0

FYI otto