#0  0x00000000004080ad in ?? ()
No symbol table info available.
#1  0x00007fee5db27d8c in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#2  0x00007fee5bc06f7d in clone () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#3  0x0000000000000000 in ?? ()
No symbol table info available.