Spinning where, you ask?

root@think:~# ./dstack plymouthd
Process ID:   186
Program name: plymouthd
Program path: /sbin/plymouthd
Thread count: 1

81	../sysdeps/unix/syscall-template.S: No such file or directory.
Dstack of plymouthd pid 186 (/sbin/plymouthd)

[Switching to thread 1 (Thread 0x7f7d99de7740 (LWP 186))]
#0  0x00007f7d994e94b3 in __epoll_wait_nocancel ()
    at ../sysdeps/unix/syscall-template.S:81
81	in ../sysdeps/unix/syscall-template.S
#0  0x00007f7d994e94b3 in __epoll_wait_nocancel ()
    at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f7d999d082a in ply_event_loop_process_pending_events ()
   from /lib/x86_64-linux-gnu/libply.so.2
#2  0x00007f7d999d11c0 in ply_event_loop_run ()
   from /lib/x86_64-linux-gnu/libply.so.2
#3  0x0000000000404bfd in ?? ()
#4  0x00007f7d99410ea5 in __libc_start_main (main=0x4042f0, argc=3, 
    ubp_av=0x7fff00df4b78, init=<optimised out>, fini=<optimised out>, 
    rtld_fini=<optimised out>, stack_end=0x7fff00df4b68) at libc-start.c:260
#5  0x0000000000405879 in ?? ()
A debugging session is active.

	Inferior 1 [process 186] will be detached.

Quit anyway? (y or n) [answered Y; input not from terminal]
root@think:~# ./dstack plymouthd
Process ID:   186
Program name: plymouthd
Program path: /sbin/plymouthd
Thread count: 1

81	../sysdeps/unix/syscall-template.S: No such file or directory.
Dstack of plymouthd pid 186 (/sbin/plymouthd)

[Switching to thread 1 (Thread 0x7f7d99de7740 (LWP 186))]
#0  0x00007f7d994e94b3 in __epoll_wait_nocancel ()
    at ../sysdeps/unix/syscall-template.S:81
81	in ../sysdeps/unix/syscall-template.S
#0  0x00007f7d994e94b3 in __epoll_wait_nocancel ()
    at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f7d999d082a in ply_event_loop_process_pending_events ()
   from /lib/x86_64-linux-gnu/libply.so.2
#2  0x00007f7d999d11c0 in ply_event_loop_run ()
   from /lib/x86_64-linux-gnu/libply.so.2
#3  0x0000000000404bfd in ?? ()
#4  0x00007f7d99410ea5 in __libc_start_main (main=0x4042f0, argc=3, 
    ubp_av=0x7fff00df4b78, init=<optimised out>, fini=<optimised out>, 
    rtld_fini=<optimised out>, stack_end=0x7fff00df4b68) at libc-start.c:260
#5  0x0000000000405879 in ?? ()
A debugging session is active.

	Inferior 1 [process 186] will be detached.

Quit anyway? (y or n) [answered Y; input not from terminal]
root@think:~# ./dstack plymouthd
Process ID:   186
Program name: plymouthd
Program path: /sbin/plymouthd
Thread count: 1

81	../sysdeps/unix/syscall-template.S: No such file or directory.
Dstack of plymouthd pid 186 (/sbin/plymouthd)

[Switching to thread 1 (Thread 0x7f7d99de7740 (LWP 186))]
#0  0x00007f7d994e94b3 in __epoll_wait_nocancel ()
    at ../sysdeps/unix/syscall-template.S:81
81	in ../sysdeps/unix/syscall-template.S
#0  0x00007f7d994e94b3 in __epoll_wait_nocancel ()
    at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f7d999d082a in ply_event_loop_process_pending_events ()
   from /lib/x86_64-linux-gnu/libply.so.2
#2  0x00007f7d999d11c0 in ply_event_loop_run ()
   from /lib/x86_64-linux-gnu/libply.so.2
#3  0x0000000000404bfd in ?? ()
#4  0x00007f7d99410ea5 in __libc_start_main (main=0x4042f0, argc=3, 
    ubp_av=0x7fff00df4b78, init=<optimised out>, fini=<optimised out>, 
    rtld_fini=<optimised out>, stack_end=0x7fff00df4b68) at libc-start.c:260
#5  0x0000000000405879 in ?? ()
A debugging session is active.