Testing: see if the test will ice in the CI

tests/fail-dep/tokio_test/issue-3858.rs

@@ -0,0 +1,21 @@
+//@only-target-linux: We only support tokio on Linux
+
+// Test for ICE caused by weak epoll interest upgrade succeed, but attempt to retrieve
+// epoll instance failed.
+// https://github.com/rust-lang/miri/issues/3858
+use tokio::fs;
+use tokio::runtime::Handle;
+use tokio::time::Duration;
+
+fn main() {
+    let rt = tokio::runtime::Builder::new_current_thread().enable_all().build().unwrap();
+    let _enter = rt.enter();
+    rt.shutdown_timeout(Duration::from_secs(1000));
+
+    let err: std::io::Error =
+        Handle::current().block_on(fs::read_to_string("Cargo.toml")).unwrap_err();
+
+    assert_eq!(err.kind(), std::io::ErrorKind::Other);
+    let inner_err = err.get_ref().expect("no inner error");
+    assert_eq!(inner_err.to_string(), "background task failed");
+}