/usr/lib/debug/.build-id/a4/ is in qtbase5-examples-dbg 5.2.1+dfsg-1ubuntu14.
This file is owned by root:root, with mode 0o755.
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    /usr/lib/debug/.build-id/a4/29ea3a1d5f3524c662a7db83848e59e581bdf1.debug
    
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                application/x-executable | root:root | 0o644 | 850.8 KB | 
                    
    
    
    /usr/lib/debug/.build-id/a4/ccbe7bca7a7d51d58f7a4ba3d1ca2044c5a68c.debug
    
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                application/x-executable | root:root | 0o644 | 325.1 KB |