/usr/ is in libstdc++6-4.9-dbg-s390x-cross 4.9.3-13ubuntu2cross1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gdb/auto-load/usr/
/usr/share/gdb/auto-load/usr/s390x-linux-gnu/
/usr/share/gdb/auto-load/usr/s390x-linux-gnu/lib/
/usr/share/gdb/auto-load/usr/s390x-linux-gnu/lib/debug/
/usr/s390x-linux-gnu/
/usr/s390x-linux-gnu/lib/
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/usr/s390x-linux-gnu/lib/debug/libstdc++.so.6.0.20
/usr/s390x-linux-gnu/lib/debug/libstdc++.a
/usr/share/
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/usr/share/lintian/overrides/
/usr/share/lintian/overrides/libstdc++6-4.9-dbg-s390x-cross
/usr/share/gdb/
/usr/share/gdb/auto-load/
/usr/share/gdb/auto-load/usr/s390x-linux-gnu/lib/debug/libstdc++.so.6.0.20-gdb.py
/usr/share/doc/
/usr/s390x-linux-gnu/lib/debug/libstdc++.so
/usr/s390x-linux-gnu/lib/debug/libstdc++.so.6
/usr/share/doc/libstdc++6-4.9-dbg-s390x-cross