[INFO] cloning repository https://github.com/alhaad/vshnu-os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/alhaad/vshnu-os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falhaad%2Fvshnu-os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falhaad%2Fvshnu-os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e4439f972a4dc8bc8d74622fc6af1554c3403f0a
[INFO] testing alhaad/vshnu-os against 1.47.0 for beta-1.48-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falhaad%2Fvshnu-os" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alhaad/vshnu-os 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 git repo https://github.com/alhaad/vshnu-os
[INFO] finished tweaking git repo https://github.com/alhaad/vshnu-os
[INFO] tweaked toml for git repo https://github.com/alhaad/vshnu-os written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/alhaad/vshnu-os 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 3afce760b884664bf33ac64b89891c3c98770b5cebf5440dbe367d35c9c7c0b2
[INFO] running `Command { std: "docker" "start" "-a" "3afce760b884664bf33ac64b89891c3c98770b5cebf5440dbe367d35c9c7c0b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3afce760b884664bf33ac64b89891c3c98770b5cebf5440dbe367d35c9c7c0b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3afce760b884664bf33ac64b89891c3c98770b5cebf5440dbe367d35c9c7c0b2", kill_on_drop: false }`
[INFO] [stdout] 3afce760b884664bf33ac64b89891c3c98770b5cebf5440dbe367d35c9c7c0b2
[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] c7f4a16503f901a759f7715e52d2c751b5041de37a17278d1cb1d16f23e58dc5
[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" "c7f4a16503f901a759f7715e52d2c751b5041de37a17278d1cb1d16f23e58dc5", kill_on_drop: false }`
[INFO] [stderr]    Compiling compiler_builtins v0.1.0 (https://github.com/rust-lang-nursery/compiler-builtins#67e0908d)
[INFO] [stderr]    Compiling rlibc v1.0.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/git/checkouts/compiler-builtins-ec094dc45a0179c8/67e0908/build.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(i128_type)]
[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 `compiler_builtins`.
[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" "c7f4a16503f901a759f7715e52d2c751b5041de37a17278d1cb1d16f23e58dc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c7f4a16503f901a759f7715e52d2c751b5041de37a17278d1cb1d16f23e58dc5", kill_on_drop: false }`
[INFO] [stdout] c7f4a16503f901a759f7715e52d2c751b5041de37a17278d1cb1d16f23e58dc5
