#0  0x00007fa5f70bf6d3 in __epoll_wait_nocancel () at ../sysdeps/unix/syscall-template.S:84
  [Error: syscall-template.S was not found in source tree]
#1  0x000055a18269902d in sd_event_wait (e=0x55a182922090, timeout=18446744073709551615) at ../src/libsystemd/sd-event/sd-event.c:2520
  2515:         }
  2516: 
  2517:         ev_queue_max = MAX(e->n_sources, 1u);
  2518:         ev_queue = newa(struct epoll_event, ev_queue_max);
  2519: 
  2520:         m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max,
  2521:                        timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC));
  2522:         if (m < 0) {
  2523:                 if (errno == EINTR) {
  2524:                         e->state = SD_EVENT_PENDING;
  2525:                         return 1;
#2  0x000055a1826aab96 in sd_event_run (timeout=18446744073709551615, e=0x55a182922090) at ../src/libsystemd/sd-event/sd-event.c:2678
  2673:         }
  2674: 
  2675:         r = sd_event_prepare(e);
  2676:         if (r == 0)
  2677:                 /* There was nothing? Then wait... */
  2678:                 r = sd_event_wait(e, timeout);
  2679: 
  2680:         if (e->profile_delays)
  2681:                 e->last_run = now(CLOCK_MONOTONIC);
  2682: 
  2683:         if (r > 0) {
#3  sd_event_loop (e=0x55a182922090) at ../src/libsystemd/sd-event/sd-event.c:2705
  2700:         assert_return(e->state == SD_EVENT_INITIAL, -EBUSY);
  2701: 
  2702:         sd_event_ref(e);
  2703: 
  2704:         while (e->state != SD_EVENT_FINISHED) {
  2705:                 r = sd_event_run(e, (uint64_t) -1);
  2706:                 if (r < 0)
  2707:                         goto finish;
  2708:         }
  2709: 
  2710:         r = e->exit_code;
#4  0x000055a18267b317 in run (cgroup=<optimized out>, fd_uevent=<optimized out>, fd_ctrl=<optimized out>) at ../src/udev/udevd.c:1622
  1617: 
  1618:         (void) sd_notifyf(false,
  1619:                           "READY=1\n"
  1620:                           "STATUS=Processing with %u children at max", arg_children_max);
  1621: 
  1622:         r = sd_event_loop(manager->event);
  1623:         if (r < 0) {
  1624:                 log_error_errno(r, "event loop failed: %m");
  1625:                 goto exit;
  1626:         }
  1627: 
#5  main (argc=<optimized out>, argv=<optimized out>) at ../src/udev/udevd.c:1751
  1746:                 setsid();
  1747: 
  1748:                 write_string_file("/proc/self/oom_score_adj", "-1000", 0);
  1749:         }
  1750: 
  1751:         r = run(fd_ctrl, fd_uevent, cgroup);
  1752: 
  1753: exit:
  1754:         mac_selinux_finish();
  1755:         log_close();
  1756:         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;