gdb-dbg 7.11.1-0ubuntu1~16.04 (s390x binary) in ubuntu xenial

 GDB is a source-level debugger, capable of breaking programs at
 any specific line, displaying variable values, and determining
 where errors occurred. Currently, gdb supports C, C++, D,
 Objective-C, Fortran, Java, OpenCL C, Pascal, assembly, Modula-2,
 Go, and Ada. A must-have for any serious programmer.
 .
 This package contains the detached debugging symbols for the GNU
 GDB.