[INFO] fetching crate xtensa-lx-rt 0.21.0...
[INFO] testing xtensa-lx-rt-0.21.0 against 1.91.0 for beta-1.92-2
[INFO] extracting crate xtensa-lx-rt 0.21.0 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate xtensa-lx-rt 0.21.0
[INFO] finished tweaking crates.io crate xtensa-lx-rt 0.21.0
[INFO] tweaked toml for crates.io crate xtensa-lx-rt 0.21.0 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate xtensa-lx-rt 0.21.0 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate xtensa-lx-rt 0.21.0 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" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded document-features v0.2.11
[INFO] [stderr]   Downloaded xtensa-lx v0.13.0
[INFO] [stderr]   Downloaded defmt v1.0.1
[INFO] [stderr]   Downloaded proc-macro-error-attr2 v2.0.0
[INFO] [stderr]   Downloaded xtensa-lx-rt-proc-macros v0.5.0
[INFO] [stderr]   Downloaded defmt-macros v1.0.1
[INFO] [stderr]   Downloaded defmt-parser v1.0.0
[INFO] [stderr]   Downloaded proc-macro-error2 v2.0.1
[INFO] [stderr]   Downloaded litrs v0.4.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6192fc441e09c43d0aec5d93074b3ff1ba77e5b95e647258b7a73f04eeacd437
[INFO] running `Command { std: "docker" "start" "-a" "6192fc441e09c43d0aec5d93074b3ff1ba77e5b95e647258b7a73f04eeacd437", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6192fc441e09c43d0aec5d93074b3ff1ba77e5b95e647258b7a73f04eeacd437", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6192fc441e09c43d0aec5d93074b3ff1ba77e5b95e647258b7a73f04eeacd437", kill_on_drop: false }`
[INFO] [stdout] 6192fc441e09c43d0aec5d93074b3ff1ba77e5b95e647258b7a73f04eeacd437
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fd28ffe5275a0637b674724c9e498b466c3e166f70089cdaa7521de90e073971
[INFO] running `Command { std: "docker" "start" "-a" "fd28ffe5275a0637b674724c9e498b466c3e166f70089cdaa7521de90e073971", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-ident v1.0.19
[INFO] [stderr]    Compiling xtensa-lx-rt v0.21.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling litrs v0.4.2
[INFO] [stderr]    Compiling xtensa-lx v0.13.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/xtensa-lx-0.13.0/src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(asm_experimental_arch)]
[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 `xtensa-lx` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "fd28ffe5275a0637b674724c9e498b466c3e166f70089cdaa7521de90e073971", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd28ffe5275a0637b674724c9e498b466c3e166f70089cdaa7521de90e073971", kill_on_drop: false }`
[INFO] [stdout] fd28ffe5275a0637b674724c9e498b466c3e166f70089cdaa7521de90e073971