.
Thread 4 (LWP 3305):
#0  0x00007fc98e57a3dd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fc98eab9394 in ?? ()
No symbol table info available.
#2  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 3 (LWP 3306):
#0  0x00007fc98e57a3dd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fc98eab9394 in ?? ()
No symbol table info available.
#2  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (LWP 5401):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
No locals.
#1  0x00007fc98eaf9115 in ?? ()
No symbol table info available.
#2  0x0000000000003500 in ?? ()
No symbol table info available.
#3  0x00000000399dec78 in ?? ()
No symbol table info available.
#4  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (LWP 3300):
#0  0x00007fc98eaa9700 in ?? ()
No symbol table info available.
#1  0x00007fc98eaa9078 in ?? ()
No symbol table info available.
#2  0x0000000000000000 in ?? ()
No symbol table info available.