#0  0x00007fa5f70bf6d3 in __epoll_wait_nocancel () at ../sysdeps/unix/syscall-template.S:84
No locals.
#1  0x000055a18269902d in sd_event_wait (e=0x55a182922090, timeout=18446744073709551615) at ../src/libsystemd/sd-event/sd-event.c:2520
        ev_queue = 0x7ffca3d90c20
        ev_queue_max = <optimized out>
        r = <optimized out>
        m = <optimized out>
        i = <optimized out>
        __PRETTY_FUNCTION__ = "sd_event_wait"
#2  0x000055a1826aab96 in sd_event_run (timeout=18446744073709551615, e=0x55a182922090) at ../src/libsystemd/sd-event/sd-event.c:2678
        r = <optimized out>
#3  sd_event_loop (e=0x55a182922090) at ../src/libsystemd/sd-event/sd-event.c:2705
        r = <optimized out>
        __PRETTY_FUNCTION__ = "sd_event_loop"
#4  0x000055a18267b317 in run (cgroup=<optimized out>, fd_uevent=<optimized out>, fd_ctrl=<optimized out>) at ../src/udev/udevd.c:1622
        manager = 0x0
        r = 0
#5  main (argc=<optimized out>, argv=<optimized out>) at ../src/udev/udevd.c:1751
        cgroup = 0x55a1828e0010 "/system.slice/systemd-udevd.service"
        fd_ctrl = <optimized out>
        fd_uevent = <optimized out>
        r = <optimized out>
        __func__ = "main"