[INFO] cloning repository https://github.com/faisalsayed10/rustlings-exercises
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/faisalsayed10/rustlings-exercises" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffaisalsayed10%2Frustlings-exercises", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffaisalsayed10%2Frustlings-exercises'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 91530f57161bacb9738baeccd59a0b5dd08c8d8b
[INFO] checking faisalsayed10/rustlings-exercises against master#8007b506ac5da629f223b755f5a5391edd5f6d01 for pr-88041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffaisalsayed10%2Frustlings-exercises" "/workspace/builds/worker-83/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-83/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/faisalsayed10/rustlings-exercises on toolchain 8007b506ac5da629f223b755f5a5391edd5f6d01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/faisalsayed10/rustlings-exercises
[INFO] finished tweaking git repo https://github.com/faisalsayed10/rustlings-exercises
[INFO] tweaked toml for git repo https://github.com/faisalsayed10/rustlings-exercises written to /workspace/builds/worker-83/source/Cargo.toml
[INFO] crate git repo https://github.com/faisalsayed10/rustlings-exercises already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "fetch" "--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 float-cmp v0.8.0
[INFO] [stderr]   Downloaded console v0.14.1
[INFO] [stderr]   Downloaded predicates-core v1.0.2
[INFO] [stderr]   Downloaded termios v0.3.3
[INFO] [stderr]   Downloaded predicates-tree v1.0.2
[INFO] [stderr]   Downloaded assert_cmd v0.11.1
[INFO] [stderr]   Downloaded terminal_size v0.1.16
[INFO] [stderr]   Downloaded escargot v0.4.0
[INFO] [stderr]   Downloaded console v0.7.7
[INFO] [stderr]   Downloaded indicatif v0.10.3
[INFO] [stderr]   Downloaded regex v1.4.6
[INFO] [stderr]   Downloaded number_prefix v0.2.8
[INFO] [stderr]   Downloaded predicates v1.0.7
[INFO] [stderr]   Downloaded clicolors-control v1.0.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-83/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-83/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" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1e84c4771e6d8a74cd6471650400c1551f1b570f987e742bb40a3911add4f8fa
[INFO] running `Command { std: "docker" "start" "-a" "1e84c4771e6d8a74cd6471650400c1551f1b570f987e742bb40a3911add4f8fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1e84c4771e6d8a74cd6471650400c1551f1b570f987e742bb40a3911add4f8fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e84c4771e6d8a74cd6471650400c1551f1b570f987e742bb40a3911add4f8fa", kill_on_drop: false }`
[INFO] [stdout] 1e84c4771e6d8a74cd6471650400c1551f1b570f987e742bb40a3911add4f8fa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-83/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-83/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" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 68a1da609295a4bfce1580292c1e0d7a5f950432d611e6944a63196bed76e429
[INFO] running `Command { std: "docker" "start" "-a" "68a1da609295a4bfce1580292c1e0d7a5f950432d611e6944a63196bed76e429", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] error: failed to create jobserver
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to increase jobserver pipe capacity from 4096 to 8192; jobserver otherwise might deadlock
[INFO] running `Command { std: "docker" "inspect" "68a1da609295a4bfce1580292c1e0d7a5f950432d611e6944a63196bed76e429", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "68a1da609295a4bfce1580292c1e0d7a5f950432d611e6944a63196bed76e429", kill_on_drop: false }`
[INFO] [stdout] 68a1da609295a4bfce1580292c1e0d7a5f950432d611e6944a63196bed76e429