.
Thread 4 (LWP 6434):
#0  __GI___pthread_setspecific (key=4, value=0x16e1850) at pthread_setspecific.c:28
        self = <optimized out>
        idx1st = 0
        idx2nd = 0
        level2 = <optimized out>
        seq = <optimized out>
#1  0x00007f7f9e9eb9c3 in ?? ()
No symbol table info available.
#2  0x00000000016e1850 in ?? ()
No symbol table info available.
#3  0x00007f7f9e9d0308 in ?? ()
No symbol table info available.
#4  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 3 (LWP 6433):
#0  0x00007f7f9e47975a in prctl () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f7f9e9d032e in ?? ()
No symbol table info available.
#2  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (LWP 6436):
#0  clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:83
No locals.
#1  0x00007f7f9e74dea0 in __nptl_deallocate_tsd () at pthread_create.c:173
        cnt = 140185955534592
#2  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (LWP 6426):
#0  0x00007f7f9e9b2459 in ?? ()
No symbol table info available.
#1  0x00007fffdac32c68 in ?? ()
No symbol table info available.
#2  0x000000049f43563c in ?? ()
No symbol table info available.
#3  0x00007f7f9e9b1bf0 in ?? ()
No symbol table info available.
#4  0x0000000000000000 in ?? ()
No symbol table info available.