.
Thread 1 (Thread 0x7f81c6dd1760 (LWP 4709)):
#0  0x0000000000438d49 in ?? ()
No symbol table info available.
#1  0x0000000000404db2 in ?? ()
No symbol table info available.
#2  0x00007f81c572e30d in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#3  0x0000000000405521 in ?? ()
No symbol table info available.
#4  0x00007fffacba9b48 in ?? ()
No symbol table info available.
#5  0x000000000000001c in ?? ()
No symbol table info available.
#6  0x0000000000000001 in ?? ()
No symbol table info available.
#7  0x00007fffacbaa58e in ?? ()
No symbol table info available.
#8  0x0000000000000000 in ?? ()
No symbol table info available.