[INFO] fetching crate async-signals 0.3.1...
[INFO] checking async-signals-0.3.1 against try#f6e2f78768c57172b99c3e85892f867894dc7e30 for pr-75502
[INFO] extracting crate async-signals 0.3.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate async-signals 0.3.1 on toolchain f6e2f78768c57172b99c3e85892f867894dc7e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate async-signals 0.3.1
[INFO] finished tweaking crates.io crate async-signals 0.3.1
[INFO] tweaked toml for crates.io crate async-signals 0.3.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6daf1cc79488be5f31319804eb84227423ba388f213b46bf05273541a375cb0d
[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" "6daf1cc79488be5f31319804eb84227423ba388f213b46bf05273541a375cb0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6daf1cc79488be5f31319804eb84227423ba388f213b46bf05273541a375cb0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6daf1cc79488be5f31319804eb84227423ba388f213b46bf05273541a375cb0d", kill_on_drop: false }`
[INFO] [stdout] 6daf1cc79488be5f31319804eb84227423ba388f213b46bf05273541a375cb0d
[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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 10f236a4113480d0abbfbc2248986c3026f1600cdff853446d844ad891f7c55b
[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" "10f236a4113480d0abbfbc2248986c3026f1600cdff853446d844ad891f7c55b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]    Compiling libc v0.2.76
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]     Checking futures-core v0.3.5
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking once_cell v1.4.1
[INFO] [stderr]     Checking cache-padded v1.1.1
[INFO] [stderr]     Checking fastrand v1.3.4
[INFO] [stderr]     Checking pin-project-lite v0.1.7
[INFO] [stderr]    Compiling pin-project-internal v0.4.23
[INFO] [stderr]     Checking waker-fn v1.1.0
[INFO] [stderr]     Checking parking v2.0.0
[INFO] [stderr]     Checking futures-io v0.3.5
[INFO] [stderr]     Checking event-listener v2.4.0
[INFO] [stderr]    Compiling proc-macro-nested v0.1.6
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]     Checking async-task v3.0.0
[INFO] [stderr]    Compiling nix v0.17.0
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking vec-arena v0.5.2
[INFO] [stderr]    Compiling proc-macro-hack v0.5.18
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking atomic-waker v1.0.0
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking parking v1.0.6
[INFO] [stderr]     Checking scoped-tls v1.0.0
[INFO] [stderr]     Checking concurrent-queue v1.2.2
[INFO] [stderr]     Checking async-mutex v1.1.5
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]     Checking async-channel v1.4.1
[INFO] [stderr]     Checking multitask v0.2.0
[INFO] [stderr]     Checking futures-lite v0.1.11
[INFO] [stderr]     Checking kv-log-macro v1.0.7
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking blocking v0.5.2
[INFO] [stderr]     Checking socket2 v0.3.12
[INFO] [stderr]     Checking polling v0.1.5
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking async-io v0.1.11
[INFO] [stderr]     Checking async-executor v0.1.2
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling async-attributes v1.1.1
[INFO] [stderr]     Checking async-std v1.6.3
[INFO] [stderr]     Checking pin-project v0.4.23
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking async-signals v0.3.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 49.04s
[INFO] running `Command { std: "docker" "inspect" "10f236a4113480d0abbfbc2248986c3026f1600cdff853446d844ad891f7c55b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10f236a4113480d0abbfbc2248986c3026f1600cdff853446d844ad891f7c55b", kill_on_drop: false }`
[INFO] [stdout] 10f236a4113480d0abbfbc2248986c3026f1600cdff853446d844ad891f7c55b