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OpenZFS defaults acltype=off on Linux, so setfacl on anything under the data root returns 'Operation not supported' -- which killed three compose jobs of run 30695207248 the moment the filesystem matrix drew zfs. Set it at pool creation; -O properties are inherited by the docker dataset, so no second edit is needed. xattr=sa is the companion OpenZFS recommends alongside posixacl and it lowers the space cost. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>