[INFO] cloning repository https://github.com/nelhage/ultimattt
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nelhage/ultimattt" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnelhage%2Fultimattt", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnelhage%2Fultimattt'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f50df2cd672dfca80b5164d535dc3adb34f887cd
[INFO] testing nelhage/ultimattt against beta-2021-09-08 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnelhage%2Fultimattt" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nelhage/ultimattt on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/nelhage/ultimattt
[INFO] finished tweaking git repo https://github.com/nelhage/ultimattt
[INFO] tweaked toml for git repo https://github.com/nelhage/ultimattt written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/nelhage/ultimattt already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/cuviper/rust-libprobe.git`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded vergen v3.2.0
[INFO] [stderr]   Downloaded packed_simd_2 v0.3.5
[INFO] [stderr]   Downloaded hdrhistogram v7.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b6906a808001b8f3d30a380d97883acdb1ce0220c9c89359a128ed0b3ca5fc61
[INFO] running `Command { std: "docker" "start" "-a" "b6906a808001b8f3d30a380d97883acdb1ce0220c9c89359a128ed0b3ca5fc61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b6906a808001b8f3d30a380d97883acdb1ce0220c9c89359a128ed0b3ca5fc61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b6906a808001b8f3d30a380d97883acdb1ce0220c9c89359a128ed0b3ca5fc61", kill_on_drop: false }`
[INFO] [stdout] b6906a808001b8f3d30a380d97883acdb1ce0220c9c89359a128ed0b3ca5fc61
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7353b467bd149747fc940740465ff84e0fd6f5ba530a06151e5a1c031791b6a2
[INFO] running `Command { std: "docker" "start" "-a" "7353b467bd149747fc940740465ff84e0fd6f5ba530a06151e5a1c031791b6a2", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.73
[INFO] [stderr]    Compiling semver v1.0.3
[INFO] [stderr]    Compiling radium v0.5.3
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling funty v1.1.0
[INFO] [stderr]    Compiling wyz v0.2.0
[INFO] [stderr]    Compiling tap v1.0.1
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]    Compiling packed_simd_2 v0.3.5
[INFO] [stderr]    Compiling probe v0.2.1 (https://github.com/cuviper/rust-libprobe.git#ae1286b2)
[INFO] [stderr]    Compiling bytesize v1.0.1
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling nom v6.1.2
[INFO] [stderr]    Compiling time v0.1.44
[INFO] [stderr]    Compiling lexical-core v0.7.6
[INFO] [stderr]    Compiling parking_lot_core v0.7.2
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/git/checkouts/rust-libprobe-428800595a569dcb/ae1286b/src/lib.rs:99:1
[INFO] [stdout]    |
[INFO] [stdout] 99 | #![feature(asm)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `probe` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "7353b467bd149747fc940740465ff84e0fd6f5ba530a06151e5a1c031791b6a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7353b467bd149747fc940740465ff84e0fd6f5ba530a06151e5a1c031791b6a2", kill_on_drop: false }`
[INFO] [stdout] 7353b467bd149747fc940740465ff84e0fd6f5ba530a06151e5a1c031791b6a2