[INFO] fetching crate qemu_print 0.1.0...
[INFO] documenting qemu_print-0.1.0 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate qemu_print 0.1.0 into /workspace/builds/worker-66/source
[INFO] validating manifest of crates.io crate qemu_print 0.1.0 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate qemu_print 0.1.0
[INFO] finished tweaking crates.io crate qemu_print 0.1.0
[INFO] tweaked toml for crates.io crate qemu_print 0.1.0 written to /workspace/builds/worker-66/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bit_field v0.9.0
[INFO] [stderr]   Downloaded x86_64 v0.14.4
[INFO] [stderr]   Downloaded conquer-util v0.3.0
[INFO] [stderr]   Downloaded volatile v0.4.4
[INFO] [stderr]   Downloaded uart_16550 v0.2.15
[INFO] [stderr]   Downloaded conquer-once v0.3.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 66527dbb910325c3bfc896f3fc2e5b6792ae595b8fe8f66b26095fd27e90cdc5
[INFO] running `Command { std: "docker" "start" "-a" "66527dbb910325c3bfc896f3fc2e5b6792ae595b8fe8f66b26095fd27e90cdc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "66527dbb910325c3bfc896f3fc2e5b6792ae595b8fe8f66b26095fd27e90cdc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "66527dbb910325c3bfc896f3fc2e5b6792ae595b8fe8f66b26095fd27e90cdc5", kill_on_drop: false }`
[INFO] [stdout] 66527dbb910325c3bfc896f3fc2e5b6792ae595b8fe8f66b26095fd27e90cdc5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c5634cdb300b3d0ed0dd901c2a26f3364e1bd689f7d4b28192f9b2137e83c31d
[INFO] running `Command { std: "docker" "start" "-a" "c5634cdb300b3d0ed0dd901c2a26f3364e1bd689f7d4b28192f9b2137e83c31d", kill_on_drop: false }`
[INFO] [stderr]    Compiling x86_64 v0.14.4
[INFO] [stderr]     Checking bit_field v0.9.0
[INFO] [stderr]     Checking volatile v0.4.4
[INFO] [stderr]     Checking conquer-util v0.3.0
[INFO] [stderr]     Checking conquer-once v0.3.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/x86_64-0.14.4/src/lib.rs:9:37
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![cfg_attr(feature = "inline_asm", feature(asm))]
[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 `x86_64`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "c5634cdb300b3d0ed0dd901c2a26f3364e1bd689f7d4b28192f9b2137e83c31d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c5634cdb300b3d0ed0dd901c2a26f3364e1bd689f7d4b28192f9b2137e83c31d", kill_on_drop: false }`
[INFO] [stdout] c5634cdb300b3d0ed0dd901c2a26f3364e1bd689f7d4b28192f9b2137e83c31d
