Драма tokio vs async-std

package main

import (
        "io/ioutil"
)

func check(e error) {
        if e != nil {
                panic(e)
        }
}

func main() {
        finished1 := make(chan bool)
        finished2 := make(chan bool)

        go func() {
                d1 := []byte("hello\ngo\n")
                err := ioutil.WriteFile("/tmp/dat1", d1, 0644)
                check(err)
                finished1 <- true
        }()

        go func() {
                d1 := []byte("hello\ngo\n")
                err := ioutil.WriteFile("/tmp/dat2", d1, 0644)
                check(err)
                finished2 <- true
        }()

        <-finished1
        <-finished2

}

[pid 24474] openat(AT_FDCWD, "/tmp/dat2", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0644 <unfinished ...>
[pid 24476] <... nanosleep resumed> NULL) = 0
[pid 24475] nanosleep({tv_sec=0, tv_nsec=20000},  <unfinished ...>
[pid 24474] <... openat resumed> )      = 3
[pid 24476] futex(0xc000076148, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 24474] epoll_create1(EPOLL_CLOEXEC <unfinished ...>
[pid 24478] <... futex resumed> )       = 0
[pid 24474] <... epoll_create1 resumed> ) = 4
[pid 24478] futex(0xc000076148, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid 24476] <... futex resumed> )       = 1
[pid 24474] epoll_ctl(4, EPOLL_CTL_ADD, 3, {EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLET, {u32=157642408, u64=140144940510888}} <unfinished ...>
[pid 24475] <... nanosleep resumed> NULL) = 0
[pid 24474] <... epoll_ctl resumed> )   = -1 EPERM (Operation not permitted)
[pid 24475] nanosleep({tv_sec=0, tv_nsec=20000},  <unfinished ...>
[pid 24474] epoll_ctl(4, EPOLL_CTL_DEL, 3, 0xc00004ed9c) = -1 EPERM (Operation not permitted)
[pid 24476] openat(AT_FDCWD, "/tmp/dat1", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0644 <unfinished ...>
[pid 24474] write(3, "hello\ngo\n", 9 <unfinished ...>
[pid 24475] <... nanosleep resumed> NULL) = 0
[pid 24474] <... write resumed> )       = 9
[pid 24476] <... openat resumed> )      = 5
[pid 24474] close(3 <unfinished ...>
[pid 24475] nanosleep({tv_sec=0, tv_nsec=20000},  <unfinished ...>
[pid 24474] <... close resumed> )       = 0
[pid 24476] epoll_ctl(4, EPOLL_CTL_ADD, 5, {EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLET, {u32=157642408, u64=140144940510888}} <unfinished ...>
[pid 24474] futex(0x534a48, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid 24476] <... epoll_ctl resumed> )   = -1 EPERM (Operation not permitted)
[pid 24475] <... nanosleep resumed> NULL) = 0
[pid 24476] epoll_ctl(4, EPOLL_CTL_DEL, 5, 0xc00009ad9c <unfinished ...>
[pid 24475] nanosleep({tv_sec=0, tv_nsec=20000},  <unfinished ...>
[pid 24476] <... epoll_ctl resumed> )   = -1 EPERM (Operation not permitted)
[pid 24476] write(5, "hello\ngo\n", 9 <unfinished ...>
[pid 24475] <... nanosleep resumed> NULL) = 0
[pid 24476] <... write resumed> )       = 9
[pid 24475] nanosleep({tv_sec=0, tv_nsec=20000},  <unfinished ...>
[pid 24476] close(5)                    = 0