[INFO] fetching crate read_utf8 0.1.2...
[INFO] checking read_utf8-0.1.2 against try#9961e55b3687a6d0b2bab4af0e5e81494b09be81 for pr-139087-1
[INFO] extracting crate read_utf8 0.1.2 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate read_utf8 0.1.2
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate read_utf8 0.1.2
[INFO] tweaked toml for crates.io crate read_utf8 0.1.2 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate read_utf8 0.1.2 on toolchain 9961e55b3687a6d0b2bab4af0e5e81494b09be81
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9961e55b3687a6d0b2bab4af0e5e81494b09be81" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate read_utf8 0.1.2 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" "+9961e55b3687a6d0b2bab4af0e5e81494b09be81" "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
[ERROR] error running command: no output for 300 seconds
[INFO] checking read_utf8-0.1.2 against try#9961e55b3687a6d0b2bab4af0e5e81494b09be81 for pr-139087-1
[INFO] extracting crate read_utf8 0.1.2 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate read_utf8 0.1.2
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate read_utf8 0.1.2
[INFO] tweaked toml for crates.io crate read_utf8 0.1.2 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate read_utf8 0.1.2 on toolchain 9961e55b3687a6d0b2bab4af0e5e81494b09be81
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9961e55b3687a6d0b2bab4af0e5e81494b09be81" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate read_utf8 0.1.2 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" "+9961e55b3687a6d0b2bab4af0e5e81494b09be81" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+9961e55b3687a6d0b2bab4af0e5e81494b09be81" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5b557e93fdde421f64e7b5a39b680d4014beb6313ce2bd691c1ff3cff24437d1
[INFO] running `Command { std: "docker" "start" "-a" "5b557e93fdde421f64e7b5a39b680d4014beb6313ce2bd691c1ff3cff24437d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5b557e93fdde421f64e7b5a39b680d4014beb6313ce2bd691c1ff3cff24437d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b557e93fdde421f64e7b5a39b680d4014beb6313ce2bd691c1ff3cff24437d1", kill_on_drop: false }`
[INFO] [stdout] 5b557e93fdde421f64e7b5a39b680d4014beb6313ce2bd691c1ff3cff24437d1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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" "+9961e55b3687a6d0b2bab4af0e5e81494b09be81" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 87ee1d83ef0abe001c89ed64a1b17cbe3d52bd0fc8ebbeed911cabd5a64f0bf2
[INFO] running `Command { std: "docker" "start" "-a" "87ee1d83ef0abe001c89ed64a1b17cbe3d52bd0fc8ebbeed911cabd5a64f0bf2", kill_on_drop: false }`
[INFO] [stderr]     Checking read_utf8 v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.44s
[INFO] running `Command { std: "docker" "inspect" "87ee1d83ef0abe001c89ed64a1b17cbe3d52bd0fc8ebbeed911cabd5a64f0bf2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87ee1d83ef0abe001c89ed64a1b17cbe3d52bd0fc8ebbeed911cabd5a64f0bf2", kill_on_drop: false }`
[INFO] [stdout] 87ee1d83ef0abe001c89ed64a1b17cbe3d52bd0fc8ebbeed911cabd5a64f0bf2