Greetd segfault coredump on Calculate

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Reading symbols from /usr/bin/greetd...
[New LWP 22008]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `greetd'.
#0  0x00007f2a8b8f6be6 in epoll_wait () from /lib64/libc.so.6
(gdb) bt full
#0  0x00007f2a8b8f6be6 in epoll_wait () from /lib64/libc.so.6
No symbol table info available.
#1  0x0000561249d1ddf3 in mio::sys::unix::epoll::Selector::select (self=0x56124a7c3a50, evts=0x7ffc40f375b8, awake
ner=..., timeout=...)
    at /home/angelo/.cargo/registry/src/github.com-1ecc6299db9ec823/mio-0.6.22/src/sys/unix/epoll.rs:72
        timeout_ms = -1
#2  0x0000561249d148b5 in mio::poll::Poll::poll2 (self=0x56124a7c3a50, events=0x7ffc40f375b8, timeout=..., interru
ptible=false)
    at /home/angelo/.cargo/registry/src/github.com-1ecc6299db9ec823/mio-0.6.22/src/poll.rs:1178
        now = std::time::Instant (std::sys::unix::time::inner::Instant {t: std::sys::unix::time::Timespec {t: libc
::unix::timespec {tv_sec: 1002, tv_nsec: 858331774}}})
#3  0x0000561249d145b2 in mio::poll::Poll::poll1 (self=0x56124a7c3a50, events=0x7ffc40f375b8, timeout=..., interru
ptible=false)
    at /home/angelo/.cargo/registry/src/github.com-1ecc6299db9ec823/mio-0.6.22/src/poll.rs:1139
        curr = 0
        zero = core::option::Option<core::time::Duration>::Some(core::time::Duration {secs: 0, nanos: 0})
#4  0x0000561249d13f2d in mio::poll::Poll::poll (self=0x56124a7c3a50, events=0x7ffc40f375b8, timeout=...)
    at /home/angelo/.cargo/registry/src/github.com-1ecc6299db9ec823/mio-0.6.22/src/poll.rs:1010
No locals.
#5  0x0000561249cd76bc in tokio::io::driver::Driver::turn (self=0x7ffc40f375b8, max_wait=...)
    at /home/angelo/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.11/src/io/driver/mod.rs:107
No locals.
#6  0x0000561249cd7d83 in tokio::io::driver::{{impl}}::park (self=0x7ffc40f375b8) at /home/angelo/.cargo/registry/
src/github.com-1ecc6299db9ec823/tokio-0.2.11/src/io/driver/mod.rs:176
No locals.
#7  0x0000561249c548b4 in tokio::park::either::{{impl}}::park<tokio::io::driver::Driver,tokio::park::thread::ParkT
hread> (self=0x7ffc40f375b0)
    at /home/angelo/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.11/src/park/either.rs:28
        a = 0x7ffc40f375b8
#8  0x0000561249bf43ad in tokio::time::driver::{{impl}}::park<tokio::park::either::Either<tokio::io::driver::Drive
r, tokio::park::thread::ParkThread>> (self=0x7ffc40f37588)
    at /home/angelo/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.11/src/time/driver/mod.rs:261
No locals.
#9  0x0000561249c54953 in tokio::park::either::{{impl}}::park<tokio::time::driver::Driver<tokio::park::either::Eit
her<tokio::io::driver::Driver, tokio::park::thread::ParkThread>>,tokio::park::either::Either<tokio::io::driver::Dr
iver, tokio::park::thread::ParkThread>> (self=0x7ffc40f37580)
    at /home/angelo/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.11/src/park/either.rs:28
        a = 0x7ffc40f37588
#10 0x0000561249c375a3 in tokio::runtime::basic_scheduler::SchedulerPriv::tick<tokio::park::either::Either<tokio::
time::driver::Driver<tokio::park::either::Either<tokio::io::driver::Driver, tokio::park::thread::ParkThread>>, tok
io::park::either::Either<tokio::io::driver::Driver, tokio::park::thread::ParkThread>>> (self=0x56124a7c82d0, local
=0x7ffc40f37580)
    at /home/angelo/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.11/src/runtime/basic_scheduler.rs:18
7
        next = core::option::Option<tokio::task::Task<tokio::runtime::basic_scheduler::SchedulerPriv>>::None
        tick = 93
        __next = 0
        iter = core::ops::range::Range<usize> {start: 1, end: 61}
#11 0x0000561249c3794c in tokio::runtime::basic_scheduler::BasicScheduler<tokio::park::either::Either<tokio::time:
:driver::Driver<tokio::park::either::Either<tokio::io::driver::Driver, tokio::park::thread::ParkThread>>, tokio::p
ark::either::Either<tokio::io::driver::Driver, tokio::park::thread::ParkThread>>>::block_on<tokio::park::either::E
ither<tokio::time::driver::Driver<tokio::park::either::Either<tokio::io::driver::Driver, tokio::park::thread::Park
Thread>>, tokio::park::either::Either<tokio::io::driver::Driver, tokio::park::thread::ParkThread>>,core::future::f
rom_generator::GenFuture<generator-0>> (self=0x7ffc40f37578, future=...) at /home/angelo/.cargo/registry/src/githu
b.com-1ecc6299db9ec823/tokio-0.2.11/src/runtime/basic_scheduler.rs:142
        future = core::pin::Pin<&mut core::future::from_generator::GenFuture<generator-0>> {pointer: 0x7ffc40f33af
0}
        cx = core::task::wake::Context {waker: 0x7ffc40f32bb8, _marker: core::marker::PhantomData<fn(&()) -> &()>}
        waker = core::mem::manually_drop::ManuallyDrop<core::task::wake::Waker> {value: core::task::wake::Waker {w
aker: core::task::wake::RawWaker {data: 0x56124a7c82d0, vtable: 0x561249dec0e0}}}
        raw_waker = core::task::wake::RawWaker {data: 0x56124a7c82d0, vtable: 0x561249dec0e0}
        _enter = tokio::runtime::enter::Enter {_p: core::marker::PhantomData<core::cell::RefCell<()>>}
        _guard = tokio::runtime::basic_scheduler::{{impl}}::block_on::Guard {old: 0x0}
        scheduler = 0x56124a7c82d0
        local = 0x7ffc40f37580
#12 0x0000561249c2da99 in tokio::runtime::{{impl}}::block_on::{{closure}}<core::future::from_generator::GenFuture<
generator-0>> ()
    at /home/angelo/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.11/src/runtime/mod.rs:411
        exec = 0x7ffc40f37578
        kind = 0x7ffc40f37570
        future = core::future::from_generator::GenFuture<generator-0> (<error reading variable>
#13 0x0000561249c357f2 in tokio::runtime::context::enter<closure-0,()> (new=..., f=...) at /home/angelo/.cargo/reg
istry/src/github.com-1ecc6299db9ec823/tokio-0.2.11/src/runtime/context.rs:72
        _guard = tokio::runtime::context::enter::DropGuard (core::option::Option<tokio::runtime::handle::Handle>::
None)
#14 0x0000561249c043cf in tokio::runtime::handle::Handle::enter<closure-0,()> (self=0x7ffc40f375e8, f=...)
    at /home/angelo/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.11/src/runtime/handle.rs:34
No locals.
#15 0x0000561249c2da0d in tokio::runtime::Runtime::block_on<core::future::from_generator::GenFuture<generator-0>>
(self=0x7ffc40f37570, future=...)
    at /home/angelo/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.11/src/runtime/mod.rs:408
        kind = 0x7ffc40f37570
#16 0x0000561249c0aa4a in greetd::main () at greetd/src/main.rs:32
No locals.
(gdb)      quit