(no debugging symbols found)...done. Loaded symbols for /lib64/ld-linux-x86-64.so.2 0x00002b49becfa450 in __read_nocancel () from /lib/libc.so.6 (gdb) bt #0 0x00002b49becfa450 in __read_nocancel () from /lib/libc.so.6 #1 0x00002b49beca1ac3 in _IO_file_xsgetn_internal () from /lib/libc.so.6 #2 0x00002b49beca112e in fread_unlocked () from /lib/libc.so.6 #3 0x0000000000402839 in ?? () #4 0x00000000004049d3 in ?? () #5 0x00002b49bec558e4 in __libc_start_main () from /lib/libc.so.6 #6 0x000000000040193a in ?? () #7 0x00007fffec08bd18 in ?? () #8 0x0000000000000000 in ?? () (gdb)