[INFO] fetching crate unix 0.6.10...
[INFO] testing unix-0.6.10 against beta-2020-07-24 for beta-1.46-1
[INFO] extracting crate unix 0.6.10 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate unix 0.6.10 on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate unix 0.6.10
[INFO] finished tweaking crates.io crate unix 0.6.10
[INFO] tweaked toml for crates.io crate unix 0.6.10 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c34e2e63efc1a453dc99410b848dea923ee14b2d5c848d9f1e3752109e07aafa
[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" "c34e2e63efc1a453dc99410b848dea923ee14b2d5c848d9f1e3752109e07aafa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c34e2e63efc1a453dc99410b848dea923ee14b2d5c848d9f1e3752109e07aafa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c34e2e63efc1a453dc99410b848dea923ee14b2d5c848d9f1e3752109e07aafa", kill_on_drop: false }`
[INFO] [stdout] c34e2e63efc1a453dc99410b848dea923ee14b2d5c848d9f1e3752109e07aafa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4e48865c3625de96b6eb0201d3c53b091d75bc0a1e9b63671fdc844a0ad7561f
[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" "4e48865c3625de96b6eb0201d3c53b091d75bc0a1e9b63671fdc844a0ad7561f", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling ptr v0.2.2
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling hash-table v0.2.4
[INFO] [stderr]    Compiling siphasher v0.2.3
[INFO] [stderr]    Compiling containers v0.9.8
[INFO] [stderr]    Compiling either v1.5.3
[INFO] [stderr]    Compiling i-o v0.4.7
[INFO] [stderr]    Compiling heap v0.1.0
[INFO] [stderr]    Compiling idem v0.4.0
[INFO] [stderr]    Compiling rel v0.2.0
[INFO] [stderr]    Compiling libc-interface v0.1.1
[INFO] [stderr]    Compiling utf v0.1.5
[INFO] [stderr]    Compiling flags v0.1.4
[INFO] [stderr]    Compiling system-call v0.1.2
[INFO] [stderr]    Compiling unreachable v1.0.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/system-call-0.1.2/src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(llvm_asm)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling fallible v0.1.3
[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 `system-call`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "4e48865c3625de96b6eb0201d3c53b091d75bc0a1e9b63671fdc844a0ad7561f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e48865c3625de96b6eb0201d3c53b091d75bc0a1e9b63671fdc844a0ad7561f", kill_on_drop: false }`
[INFO] [stdout] 4e48865c3625de96b6eb0201d3c53b091d75bc0a1e9b63671fdc844a0ad7561f