[INFO] cloning repository https://github.com/echoptic/kernel
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/echoptic/kernel" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fechoptic%2Fkernel", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fechoptic%2Fkernel'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0b881ecc768efc8b89f1f7bb8427fd1f8297d6c9
[INFO] testing echoptic/kernel against beta-2022-02-22 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fechoptic%2Fkernel" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/echoptic/kernel on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-0/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-0/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/echoptic/kernel
[INFO] finished tweaking git repo https://github.com/echoptic/kernel
[INFO] tweaked toml for git repo https://github.com/echoptic/kernel written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/echoptic/kernel already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded uart_16550 v0.2.16
[INFO] [stderr]   Downloaded spinning_top v0.2.4
[INFO] [stderr]   Downloaded buddy_system_allocator v0.8.0
[INFO] [stderr]   Downloaded conquer-util v0.3.0
[INFO] [stderr]   Downloaded x86_64 v0.14.7
[INFO] [stderr]   Downloaded conquer-once v0.3.2
[INFO] [stderr]   Downloaded qemu_print v0.1.0
[INFO] [stderr]   Downloaded stivale-boot v0.2.6
[INFO] [stderr]   Downloaded slab_allocator_rs v1.0.1
[INFO] [stderr]   Downloaded spin v0.7.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f20ef2c3173a7233a4185cc17f53427d9cc2d9a08e37784e3fe5790652838c08
[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" "f20ef2c3173a7233a4185cc17f53427d9cc2d9a08e37784e3fe5790652838c08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f20ef2c3173a7233a4185cc17f53427d9cc2d9a08e37784e3fe5790652838c08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f20ef2c3173a7233a4185cc17f53427d9cc2d9a08e37784e3fe5790652838c08", kill_on_drop: false }`
[INFO] [stdout] f20ef2c3173a7233a4185cc17f53427d9cc2d9a08e37784e3fe5790652838c08
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", 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] d658db0ff85d6029b4478447f39c172557e2bca60a6278378a9e1aad2c09cc35
[INFO] running `Command { std: "docker" "start" "-a" "d658db0ff85d6029b4478447f39c172557e2bca60a6278378a9e1aad2c09cc35", kill_on_drop: false }`
[INFO] [stderr]    Compiling x86_64 v0.14.7
[INFO] [stderr]    Compiling spin v0.7.1
[INFO] [stderr]    Compiling spinning_top v0.2.4
[INFO] [stderr]    Compiling spin v0.9.2
[INFO] [stderr]    Compiling stivale-boot v0.2.6
[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/stivale-boot-0.2.6/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_fn_fn_ptr_basics)]
[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 `stivale-boot` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "d658db0ff85d6029b4478447f39c172557e2bca60a6278378a9e1aad2c09cc35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d658db0ff85d6029b4478447f39c172557e2bca60a6278378a9e1aad2c09cc35", kill_on_drop: false }`
[INFO] [stdout] d658db0ff85d6029b4478447f39c172557e2bca60a6278378a9e1aad2c09cc35