[INFO] fetching crate multitask 0.2.0...
[INFO] checking multitask-0.2.0 against master#7f5a42b073dc2bee2aa625052eb066ee07072048 for pr-78991
[INFO] extracting crate multitask 0.2.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate multitask 0.2.0 on toolchain 7f5a42b073dc2bee2aa625052eb066ee07072048
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate multitask 0.2.0
[INFO] finished tweaking crates.io crate multitask 0.2.0
[INFO] tweaked toml for crates.io crate multitask 0.2.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "fetch" "--locked" "--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-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ac861013fede4b2d01a8e045ae4be8b75d6e381641e3f084e6885f1cca28fcba
[INFO] running `Command { std: "docker" "start" "-a" "ac861013fede4b2d01a8e045ae4be8b75d6e381641e3f084e6885f1cca28fcba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ac861013fede4b2d01a8e045ae4be8b75d6e381641e3f084e6885f1cca28fcba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac861013fede4b2d01a8e045ae4be8b75d6e381641e3f084e6885f1cca28fcba", kill_on_drop: false }`
[INFO] [stdout] ac861013fede4b2d01a8e045ae4be8b75d6e381641e3f084e6885f1cca28fcba
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a49fcece5bdc82b4d2531e2026b8e93e4b61c7bfe806f0e5c32d6940f94bb81e
[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" "a49fcece5bdc82b4d2531e2026b8e93e4b61c7bfe806f0e5c32d6940f94bb81e", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking once_cell v1.5.2
[INFO] [stderr]     Checking async-task v3.0.0
[INFO] [stderr]     Checking vec-arena v0.5.2
[INFO] [stderr]     Checking parking v1.0.6
[INFO] [stderr]     Checking async-channel v1.5.1
[INFO] [stderr]     Checking socket2 v0.3.16
[INFO] [stderr]     Checking multitask v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking polling v0.1.9
[INFO] [stderr]     Checking futures-lite v0.1.11
[INFO] [stderr]     Checking blocking v0.4.7
[INFO] [stderr]     Checking async-io v0.1.11
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.99s
[INFO] running `Command { std: "docker" "inspect" "a49fcece5bdc82b4d2531e2026b8e93e4b61c7bfe806f0e5c32d6940f94bb81e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a49fcece5bdc82b4d2531e2026b8e93e4b61c7bfe806f0e5c32d6940f94bb81e", kill_on_drop: false }`
[INFO] [stdout] a49fcece5bdc82b4d2531e2026b8e93e4b61c7bfe806f0e5c32d6940f94bb81e