[INFO] fetching crate async-task 4.0.2...
[INFO] checking async-task-4.0.2 against try#894d32a5432c6a6461bb2aac7c3d5f2e87dce83f for pr-77015
[INFO] extracting crate async-task 4.0.2 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate async-task 4.0.2 on toolchain 894d32a5432c6a6461bb2aac7c3d5f2e87dce83f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate async-task 4.0.2
[INFO] finished tweaking crates.io crate async-task 4.0.2
[INFO] tweaked toml for crates.io crate async-task 4.0.2 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate async-task 4.0.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded easy-parallel v3.1.0
[INFO] [stderr]   Downloaded async-semaphore v1.1.0
[INFO] [stderr]   Downloaded async-barrier v1.0.1
[INFO] [stderr]   Downloaded async-lock v2.1.3
[INFO] [stderr]   Downloaded async-net v1.3.0
[INFO] [stderr]   Downloaded async-process v1.0.0
[INFO] [stderr]   Downloaded smol v1.0.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e075a1e9184ca5fc9d51f407c1a7ad6bce6f5b7b5ada0f29b284db20d2909fd1
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e075a1e9184ca5fc9d51f407c1a7ad6bce6f5b7b5ada0f29b284db20d2909fd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e075a1e9184ca5fc9d51f407c1a7ad6bce6f5b7b5ada0f29b284db20d2909fd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e075a1e9184ca5fc9d51f407c1a7ad6bce6f5b7b5ada0f29b284db20d2909fd1", kill_on_drop: false }`
[INFO] [stdout] e075a1e9184ca5fc9d51f407c1a7ad6bce6f5b7b5ada0f29b284db20d2909fd1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1e2bdc8139ad907d353314c8e343269f5ca5bec9b76d88cce027e3c54b8425cd
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1e2bdc8139ad907d353314c8e343269f5ca5bec9b76d88cce027e3c54b8425cd", 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]     Checking event-listener v2.4.0
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking cache-padded v1.1.1
[INFO] [stderr]     Checking futures-core v0.3.5
[INFO] [stderr]     Checking parking v2.0.0
[INFO] [stderr]     Checking fastrand v1.3.5
[INFO] [stderr]     Checking waker-fn v1.1.0
[INFO] [stderr]     Checking futures-io v0.3.5
[INFO] [stderr]     Checking once_cell v1.4.1
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking vec-arena v1.0.0
[INFO] [stderr]     Checking atomic-waker v1.0.0
[INFO] [stderr]     Checking async-task v3.0.0
[INFO] [stderr]     Checking easy-parallel v3.1.0
[INFO] [stderr]     Checking async-task v4.0.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking lock_api v0.4.1
[INFO] [stderr]     Checking nb-connect v1.0.0
[INFO] [stderr]     Checking signal-hook-registry v1.2.1
[INFO] [stderr]     Checking async-mutex v1.3.0
[INFO] [stderr]     Checking async-semaphore v1.1.0
[INFO] [stderr]     Checking concurrent-queue v1.2.2
[INFO] [stderr]     Checking signal-hook v0.1.16
[INFO] [stderr]     Checking spinning_top v0.2.2
[INFO] [stderr]     Checking async-barrier v1.0.1
[INFO] [stderr]     Checking async-rwlock v1.1.0
[INFO] [stderr]     Checking async-channel v1.4.2
[INFO] [stderr]     Checking flume v0.9.0
[INFO] [stderr]     Checking async-lock v2.1.3
[INFO] [stderr]     Checking polling v1.0.3
[INFO] [stderr]     Checking futures-lite v1.7.0
[INFO] [stderr]     Checking blocking v1.0.0
[INFO] [stderr]     Checking async-io v1.1.2
[INFO] [stderr]     Checking async-executor v1.1.1
[INFO] [stderr]     Checking async-fs v1.3.0
[INFO] [stderr]     Checking async-process v1.0.0
[INFO] [stderr]     Checking async-net v1.3.0
[INFO] [stderr]     Checking smol v1.0.1
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.89s
[INFO] running `Command { std: "docker" "inspect" "1e2bdc8139ad907d353314c8e343269f5ca5bec9b76d88cce027e3c54b8425cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e2bdc8139ad907d353314c8e343269f5ca5bec9b76d88cce027e3c54b8425cd", kill_on_drop: false }`
[INFO] [stdout] 1e2bdc8139ad907d353314c8e343269f5ca5bec9b76d88cce027e3c54b8425cd