[INFO] cloning repository https://github.com/japaric/testd
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/japaric/testd" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjaparic%2Ftestd"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjaparic%2Ftestd'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b964b668c3e6c674b0dfa66ec01ff046ec1c79d5
[INFO] testing japaric/testd against beta-2020-06-03 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjaparic%2Ftestd" "/workspace/builds/worker-6/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/japaric/testd on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/japaric/testd
[INFO] finished tweaking git repo https://github.com/japaric/testd
[INFO] tweaked toml for git repo https://github.com/japaric/testd written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/japaric/testd already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "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" "+beta-2020-06-03" "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] 2ab3cbb1b30da5d5762c83270d99b6acc3da33e49969a207041baba6cc54c941
[INFO] running `"docker" "start" "-a" "2ab3cbb1b30da5d5762c83270d99b6acc3da33e49969a207041baba6cc54c941"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling unicode-xid v0.0.3
[INFO] [stderr]    Compiling libc v0.2.19
[INFO] [stderr]    Compiling byteorder v1.0.0
[INFO] [stderr]    Compiling serde v0.8.21
[INFO] [stderr]    Compiling num-traits v0.1.36
[INFO] [stderr]    Compiling rustc-serialize v0.3.22
[INFO] [stderr]    Compiling syn v0.10.5
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]    Compiling tempdir v0.3.5
[INFO] [stderr]    Compiling serde_codegen_internals v0.11.3
[INFO] [stderr]    Compiling serde_codegen v0.8.21
[INFO] [stderr]    Compiling bincode v0.6.1
[INFO] [stderr]    Compiling serde_derive v0.8.21
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_derive-0.8.21/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(proc_macro, proc_macro_lib)]
[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 `serde_derive`.
[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" "2ab3cbb1b30da5d5762c83270d99b6acc3da33e49969a207041baba6cc54c941"`
[INFO] running `"docker" "rm" "-f" "2ab3cbb1b30da5d5762c83270d99b6acc3da33e49969a207041baba6cc54c941"`
[INFO] [stdout] 2ab3cbb1b30da5d5762c83270d99b6acc3da33e49969a207041baba6cc54c941