[INFO] updating cached repository https://github.com/hermitcore/rusty-loader
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/hermitcore/rusty-loader
[INFO] [stderr]    94f1a6f..8d6047a  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8d6047a43646a09d927c563e1433b67d9d67df78
[INFO] testing hermitcore/rusty-loader against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhermitcore%2Frusty-loader" "/workspace/builds/worker-5/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hermitcore/rusty-loader on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/hermitcore/rusty-loader
[INFO] finished tweaking git repo https://github.com/hermitcore/rusty-loader
[INFO] tweaked toml for git repo https://github.com/hermitcore/rusty-loader written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/hermitcore/rusty-loader already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9d94b53922214ecb333f0c2141a49f4f471329567cf68cae37dff34d584fe475
[INFO] running `"docker" "start" "-a" "9d94b53922214ecb333f0c2141a49f4f471329567cf68cae37dff34d584fe475"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling cc v1.0.54
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling x86 v0.33.0
[INFO] [stderr]    Compiling rusty-loader v0.2.5 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling bit_field v0.10.0
[INFO] [stderr]    Compiling multiboot v0.3.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling raw-cpuid v8.0.0
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/x86-0.33.0/src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(llvm_asm, core_intrinsics)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `x86`.
[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 `"docker" "inspect" "9d94b53922214ecb333f0c2141a49f4f471329567cf68cae37dff34d584fe475"`
[INFO] running `"docker" "rm" "-f" "9d94b53922214ecb333f0c2141a49f4f471329567cf68cae37dff34d584fe475"`
[INFO] [stdout] 9d94b53922214ecb333f0c2141a49f4f471329567cf68cae37dff34d584fe475