/usr/lib/debug/.build-id/ is in librbd1-dbg 0.80.11-0ubuntu1.14.04.3.
This file is owned by root:root, with mode 0o755.
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    /usr/lib/debug/.build-id/33/
    
        
    
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    /usr/lib/debug/.build-id/33/bca62c782b5cbc6aaf138b6903084a96d9955f.debug
    
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                application/x-sharedlib | root:root | 0o644 | 6.3 MB |