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MariaDB Server bootstrap will ignore the failure of InnoDB to initialize itself:
./mtr --mysqld=--innodb-read-only innodb.innodb
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10.2 6b066ec33285c089ce770c2d1eb50bc49787ee92
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innodb.innodb 'innodb' [ skipped ] Test requires InnoDB with 16k Page size.
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line
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2021-12-15 13:06:01 140419257711680 [ERROR] InnoDB: Can't create file './ibdata1' when --innodb-read-only is set
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2021-12-15 13:06:01 140419257711680 [ERROR] InnoDB: Plugin initialization aborted at srv0start.cc[1873] with error Generic error
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2021-12-15 13:06:01 140419257711680 [ERROR] Plugin 'InnoDB' init function returned error.
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2021-12-15 13:06:01 140419257711680 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
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^ Found warnings in /dev/shm/10.2o/mysql-test/var/log/mysqld.1.err
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I think that already the bootstrap should have failed.
Another (maybe more practical) way to reproduce the bootstrap failure is a too small innodb_log_file_size, as described in MDEV-27268.
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