[INFO] fetching crate perfcnt 0.6.0...
[INFO] testing perfcnt-0.6.0 against 1.47.0 for beta-1.48-1
[INFO] extracting crate perfcnt 0.6.0 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate perfcnt 0.6.0 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate perfcnt 0.6.0
[INFO] finished tweaking crates.io crate perfcnt 0.6.0
[INFO] tweaked toml for crates.io crate perfcnt 0.6.0 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate crates.io crate perfcnt 0.6.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bc1cccd5e4552e1397ecc3f4f89aacc66ec63ed4b2bd7ed1a926a9cebbe1b06f
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "bc1cccd5e4552e1397ecc3f4f89aacc66ec63ed4b2bd7ed1a926a9cebbe1b06f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bc1cccd5e4552e1397ecc3f4f89aacc66ec63ed4b2bd7ed1a926a9cebbe1b06f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bc1cccd5e4552e1397ecc3f4f89aacc66ec63ed4b2bd7ed1a926a9cebbe1b06f", kill_on_drop: false }`
[INFO] [stdout] bc1cccd5e4552e1397ecc3f4f89aacc66ec63ed4b2bd7ed1a926a9cebbe1b06f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 93b5a80180d53e0e642041909ca05c701643e5f28ba499b50c35cd24a2b3e43a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "93b5a80180d53e0e642041909ca05c701643e5f28ba499b50c35cd24a2b3e43a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]    Compiling serde v1.0.112
[INFO] [stderr]    Compiling siphasher v0.2.3
[INFO] [stderr]    Compiling serde_json v1.0.55
[INFO] [stderr]    Compiling cc v1.0.54
[INFO] [stderr]    Compiling siphasher v0.3.3
[INFO] [stderr]    Compiling bit_field v0.10.0
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling phf_shared v0.8.0
[INFO] [stderr]    Compiling phf_shared v0.7.24
[INFO] [stderr]    Compiling phf v0.7.24
[INFO] [stderr]    Compiling phf v0.8.0
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling raw-cpuid v8.1.0
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling mmap v0.1.1
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling bstr v0.2.13
[INFO] [stderr]    Compiling csv v1.1.3
[INFO] [stderr]    Compiling x86 v0.34.0
[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/x86-0.34.0/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(llvm_asm, 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`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "93b5a80180d53e0e642041909ca05c701643e5f28ba499b50c35cd24a2b3e43a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "93b5a80180d53e0e642041909ca05c701643e5f28ba499b50c35cd24a2b3e43a", kill_on_drop: false }`
[INFO] [stdout] 93b5a80180d53e0e642041909ca05c701643e5f28ba499b50c35cd24a2b3e43a
