.
Thread 4 (LWP 30466):
#0  0x00007f2c8c6da583 in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 3 (LWP 30467):
#0  0x00007f2c8d9d0c84 in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (LWP 30468):
#0  0x00007f2c8d9d0c84 in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (LWP 30463):
#0  0x00007f2c8c616f77 in ?? ()
No symbol table info available.
#1  0x00007f2c8c61a5e8 in ?? ()
No symbol table info available.
#2  0x0000000000000020 in ?? ()
No symbol table info available.
#3  0x0000000000000000 in ?? ()
No symbol table info available.