[INFO] fetching crate ark-mnt4-753 0.3.0...
[INFO] building ark-mnt4-753-0.3.0 against master#d5c88c22807925c189328ef9d923c5d2b11a95b8 for pr-87066-3
[INFO] extracting crate ark-mnt4-753 0.3.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate ark-mnt4-753 0.3.0 on toolchain d5c88c22807925c189328ef9d923c5d2b11a95b8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d5c88c22807925c189328ef9d923c5d2b11a95b8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ark-mnt4-753 0.3.0
[INFO] finished tweaking crates.io crate ark-mnt4-753 0.3.0
[INFO] tweaked toml for crates.io crate ark-mnt4-753 0.3.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d5c88c22807925c189328ef9d923c5d2b11a95b8" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d5c88c22807925c189328ef9d923c5d2b11a95b8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d5c88c22807925c189328ef9d923c5d2b11a95b8" "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] b823732c4728450d4f4022c01ddfefb31fa4f60fe29f5f01a49df24863e35653
[INFO] running `Command { std: "docker" "start" "-a" "b823732c4728450d4f4022c01ddfefb31fa4f60fe29f5f01a49df24863e35653", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b823732c4728450d4f4022c01ddfefb31fa4f60fe29f5f01a49df24863e35653", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b823732c4728450d4f4022c01ddfefb31fa4f60fe29f5f01a49df24863e35653", kill_on_drop: false }`
[INFO] [stdout] b823732c4728450d4f4022c01ddfefb31fa4f60fe29f5f01a49df24863e35653
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d5c88c22807925c189328ef9d923c5d2b11a95b8" "build" "--frozen" "--message-format=json", 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] a5270b6a5a1a617a205cb3f1627d570d8c8806e6cf60e4779e3c63be1b9641a0
[INFO] running `Command { std: "docker" "start" "-a" "a5270b6a5a1a617a205cb3f1627d570d8c8806e6cf60e4779e3c63be1b9641a0", kill_on_drop: false }`
[INFO] [stderr]    Compiling ark-mnt4-753 v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.56s
[INFO] running `Command { std: "docker" "inspect" "a5270b6a5a1a617a205cb3f1627d570d8c8806e6cf60e4779e3c63be1b9641a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a5270b6a5a1a617a205cb3f1627d570d8c8806e6cf60e4779e3c63be1b9641a0", kill_on_drop: false }`
[INFO] [stdout] a5270b6a5a1a617a205cb3f1627d570d8c8806e6cf60e4779e3c63be1b9641a0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d5c88c22807925c189328ef9d923c5d2b11a95b8" "test" "--frozen" "--no-run" "--message-format=json", 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] 58c04a9c2e2c910df3c0ba19d1a1cebdba125ca8791d1ee63da48c2ec08774f3
[INFO] running `Command { std: "docker" "start" "-a" "58c04a9c2e2c910df3c0ba19d1a1cebdba125ca8791d1ee63da48c2ec08774f3", kill_on_drop: false }`
[INFO] [stderr]    Compiling ark-mnt4-753 v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 5.45s
[INFO] running `Command { std: "docker" "inspect" "58c04a9c2e2c910df3c0ba19d1a1cebdba125ca8791d1ee63da48c2ec08774f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58c04a9c2e2c910df3c0ba19d1a1cebdba125ca8791d1ee63da48c2ec08774f3", kill_on_drop: false }`
[INFO] [stdout] 58c04a9c2e2c910df3c0ba19d1a1cebdba125ca8791d1ee63da48c2ec08774f3