[INFO] fetching crate uhyve 0.0.28...
[INFO] testing uhyve-0.0.28 against 1.59.0 for beta-1.60-1
[INFO] extracting crate uhyve 0.0.28 into /workspace/builds/worker-45/source
[INFO] validating manifest of crates.io crate uhyve 0.0.28 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-45/source/rust-toolchain
[INFO] started tweaking crates.io crate uhyve 0.0.28
[INFO] finished tweaking crates.io crate uhyve 0.0.28
[INFO] tweaked toml for crates.io crate uhyve 0.0.28 written to /workspace/builds/worker-45/source/Cargo.toml
[INFO] crate crates.io crate uhyve 0.0.28 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-45/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/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] 88aef52c79e46ba0c823d9eaea17fac323ae674a30072f85647582b95aae2565
[INFO] running `Command { std: "docker" "start" "-a" "88aef52c79e46ba0c823d9eaea17fac323ae674a30072f85647582b95aae2565", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "88aef52c79e46ba0c823d9eaea17fac323ae674a30072f85647582b95aae2565", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88aef52c79e46ba0c823d9eaea17fac323ae674a30072f85647582b95aae2565", kill_on_drop: false }`
[INFO] [stdout] 88aef52c79e46ba0c823d9eaea17fac323ae674a30072f85647582b95aae2565
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/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] 9f68fa5e58b2ef192f9eb642d84a23c3271808ee84761f12bb57a9c48610d2de
[INFO] running `Command { std: "docker" "start" "-a" "9f68fa5e58b2ef192f9eb642d84a23c3271808ee84761f12bb57a9c48610d2de", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.94
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.54
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]    Compiling cc v1.0.66
[INFO] [stderr]    Compiling regex-syntax v0.6.21
[INFO] [stderr]    Compiling unicode-width v0.1.8
[INFO] [stderr]    Compiling x86 v0.37.0
[INFO] [stderr]    Compiling unicode-segmentation v1.7.1
[INFO] [stderr]    Compiling mac_address v1.1.1
[INFO] [stderr]    Compiling winapi v0.2.8
[INFO] [stderr]    Compiling plain v0.2.3
[INFO] [stderr]    Compiling humantime v2.0.1
[INFO] [stderr]    Compiling bit_field v0.10.1
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling strum v0.20.0
[INFO] [stderr]    Compiling burst v0.0.2
[INFO] [stderr]    Compiling virtio-bindings v0.1.0
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling thread_local v1.0.1
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling raw-cpuid v9.0.0
[INFO] [stderr]    Compiling aho-corasick v0.7.15
[INFO] [stderr]    Compiling gdb-protocol v0.1.0
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling tun-tap v0.1.2
[INFO] [stderr]    Compiling regex v1.4.2
[INFO] [stderr]    Compiling vmm-sys-util v0.8.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling nix v0.19.1
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling memchr v1.0.2
[INFO] [stderr]    Compiling nix v0.20.0
[INFO] [stderr]    Compiling aligned_alloc v0.1.3
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling nom v3.2.1
[INFO] [stderr]    Compiling core_affinity v0.5.10
[INFO] [stderr]    Compiling kvm-bindings v0.4.0
[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/x86-0.37.0/src/lib.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(llvm_asm, core_intrinsics)]
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/x86-0.37.0/src/lib.rs:3:22
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(llvm_asm, core_intrinsics)]
[INFO] [stdout]   |                      ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[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 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "9f68fa5e58b2ef192f9eb642d84a23c3271808ee84761f12bb57a9c48610d2de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f68fa5e58b2ef192f9eb642d84a23c3271808ee84761f12bb57a9c48610d2de", kill_on_drop: false }`
[INFO] [stdout] 9f68fa5e58b2ef192f9eb642d84a23c3271808ee84761f12bb57a9c48610d2de