[INFO] fetching crate perf_monitor 0.2.1...
[INFO] testing perf_monitor-0.2.1 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate perf_monitor 0.2.1 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate perf_monitor 0.2.1
[INFO] finished tweaking crates.io crate perf_monitor 0.2.1
[INFO] tweaked toml for crates.io crate perf_monitor 0.2.1 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate perf_monitor 0.2.1 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 perf_monitor 0.2.1 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 9f16a62b9b19cb544b1e865e088169a1acd8b355d01d4e832f18d948dc45b877
[INFO] running `Command { std: "docker" "start" "-a" "9f16a62b9b19cb544b1e865e088169a1acd8b355d01d4e832f18d948dc45b877", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9f16a62b9b19cb544b1e865e088169a1acd8b355d01d4e832f18d948dc45b877", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f16a62b9b19cb544b1e865e088169a1acd8b355d01d4e832f18d948dc45b877", kill_on_drop: false }`
[INFO] [stdout] 9f16a62b9b19cb544b1e865e088169a1acd8b355d01d4e832f18d948dc45b877
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] da624ecb1fcfc581736c8754cb58478648c3889ab85a00f8a293f7298a6fcafb
[INFO] running `Command { std: "docker" "start" "-a" "da624ecb1fcfc581736c8754cb58478648c3889ab85a00f8a293f7298a6fcafb", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.154
[INFO] [stderr]    Compiling proc-macro2 v1.0.82
[INFO] [stderr]    Compiling glob v0.3.1
[INFO] [stderr]    Compiling regex-syntax v0.8.3
[INFO] [stderr]    Compiling rustix v0.38.34
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling linux-raw-sys v0.4.13
[INFO] [stderr]    Compiling unicode-width v0.1.12
[INFO] [stderr]    Compiling bitflags v2.5.0
[INFO] [stderr]    Compiling aho-corasick v1.1.3
[INFO] [stderr]    Compiling nom v7.1.3
[INFO] [stderr]    Compiling either v1.11.0
[INFO] [stderr]    Compiling home v0.5.9
[INFO] [stderr]    Compiling log v0.4.21
[INFO] [stderr]    Compiling humantime v2.1.0
[INFO] [stderr]    Compiling bindgen v0.59.2
[INFO] [stderr]    Compiling libloading v0.8.3
[INFO] [stderr]    Compiling rustc-hash v1.1.0
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling peeking_take_while v0.1.2
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling lazycell v1.3.0
[INFO] [stderr]    Compiling cc v1.0.97
[INFO] [stderr]    Compiling thiserror v1.0.60
[INFO] [stderr]    Compiling clang-sys v1.7.0
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stderr]    Compiling syn v2.0.62
[INFO] [stderr]    Compiling which v4.4.2
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling clap v2.34.0
[INFO] [stderr]    Compiling cexpr v0.6.0
[INFO] [stderr]    Compiling regex-automata v0.4.6
[INFO] [stderr]    Compiling thiserror-impl v1.0.60
[INFO] [stderr]    Compiling regex v1.10.4
[INFO] [stderr]    Compiling env_logger v0.9.3
[INFO] [stderr]    Compiling perf_monitor v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `fd_count_pid` is never used
[INFO] [stdout]  --> src/fd/android_linux.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn fd_count_pid(pid: u32) -> std::io::Result<usize> {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `HandleUpgrade` is never used
[INFO] [stdout]  --> src/utils/ptr_upgrade.rs:4:11
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub trait HandleUpgrade: Sized {
[INFO] [stdout]   |           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 21.45s
[INFO] running `Command { std: "docker" "inspect" "da624ecb1fcfc581736c8754cb58478648c3889ab85a00f8a293f7298a6fcafb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da624ecb1fcfc581736c8754cb58478648c3889ab85a00f8a293f7298a6fcafb", kill_on_drop: false }`
[INFO] [stdout] da624ecb1fcfc581736c8754cb58478648c3889ab85a00f8a293f7298a6fcafb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cff78dbd751900488495d64a072c39c9c34e0bda0586aa311b497a885d794dc4
[INFO] running `Command { std: "docker" "start" "-a" "cff78dbd751900488495d64a072c39c9c34e0bda0586aa311b497a885d794dc4", kill_on_drop: false }`
[INFO] [stdout] warning: function `fd_count_pid` is never used
[INFO] [stdout]  --> src/fd/android_linux.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn fd_count_pid(pid: u32) -> std::io::Result<usize> {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `HandleUpgrade` is never used
[INFO] [stdout]  --> src/utils/ptr_upgrade.rs:4:11
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub trait HandleUpgrade: Sized {
[INFO] [stdout]   |           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling perf_monitor v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:7:19
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![cfg_attr(test, feature(test))]
[INFO] [stdout]   |                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `perf_monitor` (lib test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "cff78dbd751900488495d64a072c39c9c34e0bda0586aa311b497a885d794dc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cff78dbd751900488495d64a072c39c9c34e0bda0586aa311b497a885d794dc4", kill_on_drop: false }`
[INFO] [stdout] cff78dbd751900488495d64a072c39c9c34e0bda0586aa311b497a885d794dc4
