[INFO] cloning repository https://github.com/Sprlptr48/grek_os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Sprlptr48/grek_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSprlptr48%2Fgrek_os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSprlptr48%2Fgrek_os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 114af31111f13bb9aaf7e3bdc54a3c5f962cb003
[INFO] checking Sprlptr48/grek_os against master#da897dfb6daa268a965d2d73620316ba56020a19 for pr-76219
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSprlptr48%2Fgrek_os" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Sprlptr48/grek_os on toolchain da897dfb6daa268a965d2d73620316ba56020a19
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+da897dfb6daa268a965d2d73620316ba56020a19" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Sprlptr48/grek_os
[INFO] finished tweaking git repo https://github.com/Sprlptr48/grek_os
[INFO] tweaked toml for git repo https://github.com/Sprlptr48/grek_os written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/Sprlptr48/grek_os already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+da897dfb6daa268a965d2d73620316ba56020a19" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+da897dfb6daa268a965d2d73620316ba56020a19" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 33da19a1e785c8049af1656f63e1d30b0805f9bff02c7597233bc85b6e6144df
[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" "33da19a1e785c8049af1656f63e1d30b0805f9bff02c7597233bc85b6e6144df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "33da19a1e785c8049af1656f63e1d30b0805f9bff02c7597233bc85b6e6144df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33da19a1e785c8049af1656f63e1d30b0805f9bff02c7597233bc85b6e6144df", kill_on_drop: false }`
[INFO] [stdout] 33da19a1e785c8049af1656f63e1d30b0805f9bff02c7597233bc85b6e6144df
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=forbid" "-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" "+da897dfb6daa268a965d2d73620316ba56020a19" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ba844aad6047e1898eaf2c6ae6d5067732e293ac274441e5a1b85bf304d36226
[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" "ba844aad6047e1898eaf2c6ae6d5067732e293ac274441e5a1b85bf304d36226", kill_on_drop: false }`
[INFO] [stderr]     Checking grek_os v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: couldn't read src/main.rs: stream did not contain valid UTF-8
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `grek_os`.
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[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] [stdout] error: couldn't read src/main.rs: stream did not contain valid UTF-8
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "ba844aad6047e1898eaf2c6ae6d5067732e293ac274441e5a1b85bf304d36226", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba844aad6047e1898eaf2c6ae6d5067732e293ac274441e5a1b85bf304d36226", kill_on_drop: false }`
[INFO] [stdout] ba844aad6047e1898eaf2c6ae6d5067732e293ac274441e5a1b85bf304d36226