While testing the fix of
MDEV-12699, it became clear that crash recovery of ROW_FORMAT=COMPRESSED tables is broken. If I remember correctly, an assertion would fail while applying the MLOG_COMP_REC_INSERT record.
To repeat this more easily, we should probably try to reduce the page flushing rate, or simply remove the workarounds for this bug in the
Matthias Leich, please try to find a small case for this, either with or without mariabackup. For 10.2, please use innodb_log_optimize_ddl=OFF if the test involves any CREATE INDEX or table-rebuilding ALTER TABLE.