/usr/share/mysql/mysql-test/t/shm-master.opt is in mariadb-test-5.5 5.5.36-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | --skip-grant-tables --loose-shared-memory-base-name=HeyMrBaseNameXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX$MTR_BUILD_THREAD --loose-shared-memory=1
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