[INFO] fetching crate flate2 1.0.21...
[INFO] testing flate2-1.0.21 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate flate2 1.0.21 into /workspace/builds/worker-51/source
[INFO] validating manifest of crates.io crate flate2 1.0.21 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate flate2 1.0.21
[INFO] finished tweaking crates.io crate flate2 1.0.21
[INFO] tweaked toml for crates.io crate flate2 1.0.21 written to /workspace/builds/worker-51/source/Cargo.toml
[INFO] crate crates.io crate flate2 1.0.21 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "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-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2716b723dc153296cd8e52ebeb970666b12b24bdb42268310f7ec51509b3aa06
[INFO] running `Command { std: "docker" "start" "-a" "2716b723dc153296cd8e52ebeb970666b12b24bdb42268310f7ec51509b3aa06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2716b723dc153296cd8e52ebeb970666b12b24bdb42268310f7ec51509b3aa06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2716b723dc153296cd8e52ebeb970666b12b24bdb42268310f7ec51509b3aa06", kill_on_drop: false }`
[INFO] [stdout] 2716b723dc153296cd8e52ebeb970666b12b24bdb42268310f7ec51509b3aa06
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 734e76fc408d951c1c1917cd89d3ffeab152719fdca036e451ea41ff0e335f61
[INFO] running `Command { std: "docker" "start" "-a" "734e76fc408d951c1c1917cd89d3ffeab152719fdca036e451ea41ff0e335f61", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling adler v0.2.3
[INFO] [stderr]    Compiling miniz_oxide v0.4.3
[INFO] [stderr]    Compiling flate2 v1.0.21 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.61s
[INFO] running `Command { std: "docker" "inspect" "734e76fc408d951c1c1917cd89d3ffeab152719fdca036e451ea41ff0e335f61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "734e76fc408d951c1c1917cd89d3ffeab152719fdca036e451ea41ff0e335f61", kill_on_drop: false }`
[INFO] [stdout] 734e76fc408d951c1c1917cd89d3ffeab152719fdca036e451ea41ff0e335f61
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 73cf05a125359e31cbb484708bc04ba78b428587f0c686afcafe023dd699f323
[INFO] running `Command { std: "docker" "start" "-a" "73cf05a125359e31cbb484708bc04ba78b428587f0c686afcafe023dd699f323", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling futures v0.1.30
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling net2 v0.2.37
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling mio v0.6.23
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling smallvec v0.6.13
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling tokio-sync v0.1.8
[INFO] [stderr]    Compiling tokio-io v0.1.13
[INFO] [stderr]    Compiling tokio-executor v0.1.10
[INFO] [stderr]    Compiling crossbeam-queue v0.2.3
[INFO] [stderr]    Compiling crossbeam-deque v0.7.3
[INFO] [stderr]    Compiling tokio-reactor v0.1.12
[INFO] [stderr]    Compiling tokio-threadpool v0.1.18
[INFO] [stderr]    Compiling quickcheck v0.9.2
[INFO] [stderr]    Compiling tokio-tcp v0.1.4
[INFO] [stderr]    Compiling flate2 v1.0.21 (/opt/rustwide/workdir)
[INFO] [stderr] error: could not compile `flate2`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name flate2 --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --test --cfg 'feature="default"' --cfg 'feature="miniz_oxide"' --cfg 'feature="rust_backend"' -C metadata=12f9184ee2f4d4a5 -C extra-filename=-12f9184ee2f4d4a5 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern cfg_if=/opt/rustwide/target/debug/deps/libcfg_if-97437e183f3ae6e4.rlib --extern crc32fast=/opt/rustwide/target/debug/deps/libcrc32fast-08a598dffa25bc69.rlib --extern futures=/opt/rustwide/target/debug/deps/libfutures-186c37c96b84a18b.rlib --extern libc=/opt/rustwide/target/debug/deps/liblibc-20b5401ee9b3d9e9.rlib --extern miniz_oxide=/opt/rustwide/target/debug/deps/libminiz_oxide-7944769413643ed0.rlib --extern quickcheck=/opt/rustwide/target/debug/deps/libquickcheck-6f14b7dda713a023.rlib --extern rand=/opt/rustwide/target/debug/deps/librand-a5fe5e291404e646.rlib --extern tokio_io=/opt/rustwide/target/debug/deps/libtokio_io-124462d05afbc524.rlib --extern tokio_tcp=/opt/rustwide/target/debug/deps/libtokio_tcp-b569004c3980e096.rlib --extern tokio_threadpool=/opt/rustwide/target/debug/deps/libtokio_threadpool-4ff2404e303f616f.rlib --cap-lints=warn` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "73cf05a125359e31cbb484708bc04ba78b428587f0c686afcafe023dd699f323", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73cf05a125359e31cbb484708bc04ba78b428587f0c686afcafe023dd699f323", kill_on_drop: false }`
[INFO] [stdout] 73cf05a125359e31cbb484708bc04ba78b428587f0c686afcafe023dd699f323