[INFO] fetching crate ark-ed-on-mnt4-753 0.2.0...
[INFO] checking ark-ed-on-mnt4-753-0.2.0 against master#a5f164faad4a2fed606b8160fd7ecd2d5cbba381 for pr-84920
[INFO] extracting crate ark-ed-on-mnt4-753 0.2.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate ark-ed-on-mnt4-753 0.2.0 on toolchain a5f164faad4a2fed606b8160fd7ecd2d5cbba381
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ark-ed-on-mnt4-753 0.2.0
[INFO] finished tweaking crates.io crate ark-ed-on-mnt4-753 0.2.0
[INFO] tweaked toml for crates.io crate ark-ed-on-mnt4-753 0.2.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "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] a80541dc611b3e602eac570465ccc3f69575583fe8b889b488c1c192b1522c8b
[INFO] running `Command { std: "docker" "start" "-a" "a80541dc611b3e602eac570465ccc3f69575583fe8b889b488c1c192b1522c8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a80541dc611b3e602eac570465ccc3f69575583fe8b889b488c1c192b1522c8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a80541dc611b3e602eac570465ccc3f69575583fe8b889b488c1c192b1522c8b", kill_on_drop: false }`
[INFO] [stdout] a80541dc611b3e602eac570465ccc3f69575583fe8b889b488c1c192b1522c8b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 39228983b3770e0aefcb78800148f421bb593aef28ee2e2113396a2135c269a7
[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" "39228983b3770e0aefcb78800148f421bb593aef28ee2e2113396a2135c269a7", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking pin-project-lite v0.2.6
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking tracing v0.1.26
[INFO] [stderr]     Checking rand_xorshift v0.2.0
[INFO] [stderr]    Compiling pest v2.1.3
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.4.0
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking ark-std v0.2.0
[INFO] [stderr]     Checking ark-serialize v0.2.0
[INFO] [stderr]    Compiling semver-parser v0.10.2
[INFO] [stderr]    Compiling semver v0.11.0
[INFO] [stderr]    Compiling rustc_version v0.3.3
[INFO] [stderr]    Compiling ark-ff v0.2.0
[INFO] [stderr]    Compiling ark-ff-macros v0.2.0
[INFO] [stderr]     Checking ark-ec v0.2.0
[INFO] [stderr]     Checking ark-relations v0.2.0
[INFO] [stderr]     Checking ark-mnt4-753 v0.2.0
[INFO] [stderr]     Checking ark-algebra-test-templates v0.2.0
[INFO] [stderr]     Checking ark-ed-on-mnt4-753 v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 20.15s
[INFO] running `Command { std: "docker" "inspect" "39228983b3770e0aefcb78800148f421bb593aef28ee2e2113396a2135c269a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39228983b3770e0aefcb78800148f421bb593aef28ee2e2113396a2135c269a7", kill_on_drop: false }`
[INFO] [stdout] 39228983b3770e0aefcb78800148f421bb593aef28ee2e2113396a2135c269a7