rust-analyzer: server hangs after a textDocument/didChange notification

[Trace - 6:52:46 PM] Sending notification 'textDocument/didChange'.
Params: {
    "textDocument": {
        "version": 8,
        "uri": "file:///home/cheng/Projects/Rust/tunnel-rs/tunnel/src/lib.rs"
    },
    "contentChanges": [
        {
            "range": {
                "start": {
                    "line": 31,
                    "character": 0
                },
                "end": {
                    "line": 31,
                    "character": 0
                }
            },
            "rangeLength": 0,
            "text": "\n    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>\n    where\n        D: Deserializer<'de>;"
        }
    ]
}


[Trace - 6:52:46 PM] Sending notification '$/cancelRequest'.
Params: {
    "id": 36
}


[Trace - 6:52:46 PM] Sending request 'rust-analyzer/inlayHints - (38)'.
Params: {
    "textDocument": {
        "uri": "file:///home/cheng/Projects/Rust/tunnel-rs/tunnel/src/lib.rs"
    }
}


[Trace - 6:52:46 PM] Sending notification '$/cancelRequest'.
Params: {
    "id": 37
}


[Trace - 6:52:46 PM] Sending request 'rust-analyzer/inlayHints - (39)'.
Params: {
    "textDocument": {
        "uri": "file:///home/cheng/.cargo/registry/src/github.com-1ecc6299db9ec823/serde-1.0.118/src/de/mod.rs"
    }
}


[Trace - 6:52:47 PM] Sending request 'textDocument/formatting - (40)'.
Params: {
    "textDocument": {
        "uri": "file:///home/cheng/Projects/Rust/tunnel-rs/tunnel/src/lib.rs"
    },
    "options": {
        "tabSize": 4,
        "insertSpaces": true
    }
}


[Trace - 6:52:48 PM] Sending notification 'textDocument/didSave'.
Params: {
    "textDocument": {
        "uri": "file:///home/cheng/Projects/Rust/tunnel-rs/tunnel/src/lib.rs",
        "version": 8
    }
}


[Trace - 6:52:48 PM] Sending notification '$/cancelRequest'.
Params: {
    "id": 40
}


[Trace - 6:53:04 PM] Sending request 'textDocument/hover - (41)'.
Params: {
    "textDocument": {
        "uri": "file:///home/cheng/Projects/Rust/tunnel-rs/tunnel/src/lib.rs"
    },
    "position": {
        "line": 30,
        "character": 9
    }
}