.
Thread 4 (LWP 1965):
#0  0x00007f7168a253cd in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 3 (LWP 1966):
#0  0x00007f7168a253cd in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (LWP 1913):
#0  0x00007f7168a253cd in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (LWP 1844):
#0  0x0000000000000071 in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.