[INFO] fetching crate x86_vcpu 0.5.5...
[INFO] testing x86_vcpu-0.5.5 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate x86_vcpu 0.5.5 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate x86_vcpu 0.5.5
[INFO] finished tweaking crates.io crate x86_vcpu 0.5.5
[INFO] tweaked toml for crates.io crate x86_vcpu 0.5.5 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate x86_vcpu 0.5.5 on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate x86_vcpu 0.5.5 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 861a0a58b514bc325eb42c69546ed62a61aa36814a9ea28eea5a6df8e3dfd751
[INFO] running `Command { std: "docker" "start" "-a" "861a0a58b514bc325eb42c69546ed62a61aa36814a9ea28eea5a6df8e3dfd751", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "861a0a58b514bc325eb42c69546ed62a61aa36814a9ea28eea5a6df8e3dfd751", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "861a0a58b514bc325eb42c69546ed62a61aa36814a9ea28eea5a6df8e3dfd751", kill_on_drop: false }`
[INFO] [stdout] 861a0a58b514bc325eb42c69546ed62a61aa36814a9ea28eea5a6df8e3dfd751
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 43c8a1b1c7abe36a7c93783929d5518c1de1b27787eafac43b2fdb720e5b16c7
[INFO] running `Command { std: "docker" "start" "-a" "43c8a1b1c7abe36a7c93783929d5518c1de1b27787eafac43b2fdb720e5b16c7", kill_on_drop: false }`
[INFO] [stderr]    Compiling winnow v1.0.1
[INFO] [stderr]    Compiling bit_field v0.10.3
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling x86 v0.52.0
[INFO] [stderr]    Compiling ax-memory-addr v0.6.2
[INFO] [stderr]    Compiling raw-cpuid v10.7.0
[INFO] [stderr]    Compiling volatile v0.4.6
[INFO] [stderr]    Compiling ax-errno v0.4.7
[INFO] [stderr]    Compiling numeric-enum-macro v0.2.0
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling ax-lazyinit v0.4.6
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling winnow v0.7.15
[INFO] [stderr]    Compiling toml_writer v1.1.1+spec-1.1.0
[INFO] [stderr]    Compiling bitmaps v3.2.1
[INFO] [stderr]    Compiling ax-memory-set v0.6.2
[INFO] [stderr]    Compiling ax-percpu v0.4.4
[INFO] [stderr]    Compiling spin v0.10.0
[INFO] [stderr]    Compiling x86_64 v0.15.4
[INFO] [stderr]    Compiling tock-registers v0.10.1
[INFO] [stderr]    Compiling bit v0.1.1
[INFO] [stderr]    Compiling raw-cpuid v11.6.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/x86_64-0.15.4/src/lib.rs:5:44
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![cfg_attr(feature = "abi_x86_interrupt", feature(abi_x86_interrupt))]
[INFO] [stdout]   |                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling toml_parser v1.1.2+spec-1.1.0
[INFO] [stderr]    Compiling ax-cpumask v0.3.4
[INFO] [stderr]    Compiling toml_edit v0.25.11+spec-1.1.0
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `x86_64` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "43c8a1b1c7abe36a7c93783929d5518c1de1b27787eafac43b2fdb720e5b16c7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "43c8a1b1c7abe36a7c93783929d5518c1de1b27787eafac43b2fdb720e5b16c7", kill_on_drop: false }`
[INFO] [stdout] 43c8a1b1c7abe36a7c93783929d5518c1de1b27787eafac43b2fdb720e5b16c7
