[INFO] fetching crate perfcnt 0.7.3...
[INFO] testing perfcnt-0.7.3 against 1.59.0 for beta-1.60-1
[INFO] extracting crate perfcnt 0.7.3 into /workspace/builds/worker-105/source
[INFO] validating manifest of crates.io crate perfcnt 0.7.3 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-105/source/rust-toolchain
[INFO] started tweaking crates.io crate perfcnt 0.7.3
[INFO] finished tweaking crates.io crate perfcnt 0.7.3
[INFO] tweaked toml for crates.io crate perfcnt 0.7.3 written to /workspace/builds/worker-105/source/Cargo.toml
[INFO] crate crates.io crate perfcnt 0.7.3 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9d06746eaa60004431d4a7e49e94d5efa40b415d211b3541edc5d8cb8919163a
[INFO] running `Command { std: "docker" "start" "-a" "9d06746eaa60004431d4a7e49e94d5efa40b415d211b3541edc5d8cb8919163a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9d06746eaa60004431d4a7e49e94d5efa40b415d211b3541edc5d8cb8919163a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d06746eaa60004431d4a7e49e94d5efa40b415d211b3541edc5d8cb8919163a", kill_on_drop: false }`
[INFO] [stdout] 9d06746eaa60004431d4a7e49e94d5efa40b415d211b3541edc5d8cb8919163a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c38fbda2fcd8cd0f1cc2c235a258ef616a0fe8bf4a98d06b5f3ef27b9f3361dd
[INFO] running `Command { std: "docker" "start" "-a" "c38fbda2fcd8cd0f1cc2c235a258ef616a0fe8bf4a98d06b5f3ef27b9f3361dd", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling serde v1.0.112
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling siphasher v0.3.3
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling itoa v0.4.6
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling remove_dir_all v0.5.3
[INFO] [stderr]    Compiling libc v0.1.12
[INFO] [stderr]    Compiling bit_field v0.10.1
[INFO] [stderr]    Compiling phf_shared v0.9.0
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling phf v0.9.0
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stderr]    Compiling raw-cpuid v10.2.0
[INFO] [stderr]    Compiling regex-automata v0.1.9
[INFO] [stderr]    Compiling getrandom v0.2.4
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling mmap v0.1.1
[INFO] [stderr]    Compiling phf_generator v0.9.1
[INFO] [stderr]    Compiling phf_codegen v0.9.0
[INFO] [stderr]    Compiling bstr v0.2.13
[INFO] [stderr]    Compiling csv v1.1.6
[INFO] [stderr]    Compiling x86 v0.45.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/x86-0.45.0/src/lib.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(core_intrinsics)]
[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 `x86` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "c38fbda2fcd8cd0f1cc2c235a258ef616a0fe8bf4a98d06b5f3ef27b9f3361dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c38fbda2fcd8cd0f1cc2c235a258ef616a0fe8bf4a98d06b5f3ef27b9f3361dd", kill_on_drop: false }`
[INFO] [stdout] c38fbda2fcd8cd0f1cc2c235a258ef616a0fe8bf4a98d06b5f3ef27b9f3361dd