[INFO] fetching crate unshare 0.7.0...
[INFO] checking unshare-0.7.0 against master#1b8f2e46e14b08208a53585570edd9206374aae8 for pr-155418
[INFO] extracting crate unshare 0.7.0 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate unshare 0.7.0
[INFO] finished tweaking crates.io crate unshare 0.7.0
[INFO] tweaked toml for crates.io crate unshare 0.7.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate unshare 0.7.0 on toolchain 1b8f2e46e14b08208a53585570edd9206374aae8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1b8f2e46e14b08208a53585570edd9206374aae8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate unshare 0.7.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1b8f2e46e14b08208a53585570edd9206374aae8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rand v0.8.3
[INFO] [stderr]   Downloaded rand_chacha v0.3.0
[INFO] [stderr]   Downloaded rand_core v0.6.2
[INFO] [stderr]   Downloaded argparse v0.2.2
[INFO] [stderr]   Downloaded ppv-lite86 v0.2.10
[INFO] [stderr]   Downloaded getrandom v0.2.2
[INFO] [stderr]   Downloaded rand_hc v0.3.0
[INFO] [stderr]   Downloaded cc v1.0.67
[INFO] [stderr]   Downloaded nix v0.20.0
[INFO] [stderr]   Downloaded libc v0.2.94
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1b8f2e46e14b08208a53585570edd9206374aae8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 42d4d2679eaf9b2dbf00e50ed2acfd6e2548bd19314338043cd74991a9b5b9ee
[INFO] running `Command { std: "docker" "start" "-a" "42d4d2679eaf9b2dbf00e50ed2acfd6e2548bd19314338043cd74991a9b5b9ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "42d4d2679eaf9b2dbf00e50ed2acfd6e2548bd19314338043cd74991a9b5b9ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42d4d2679eaf9b2dbf00e50ed2acfd6e2548bd19314338043cd74991a9b5b9ee", kill_on_drop: false }`
[INFO] [stdout] 42d4d2679eaf9b2dbf00e50ed2acfd6e2548bd19314338043cd74991a9b5b9ee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1b8f2e46e14b08208a53585570edd9206374aae8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 756622199cf1c741ae11b6085da177736bef05bed6c36fb06f84c3dc1ea9cf46
[INFO] running `Command { std: "docker" "start" "-a" "756622199cf1c741ae11b6085da177736bef05bed6c36fb06f84c3dc1ea9cf46", kill_on_drop: false }`
[INFO] [stderr] error: no matching package named `libc` found
[INFO] [stderr] location searched: crates.io index
[INFO] [stderr] required by package `unshare v0.7.0 (/opt/rustwide/workdir)`
[INFO] [stderr] note: offline mode (via `--frozen`) can sometimes cause surprising resolution failures
[INFO] [stderr] help: if this error is too confusing you may wish to retry without `--frozen`
[INFO] running `Command { std: "docker" "inspect" "756622199cf1c741ae11b6085da177736bef05bed6c36fb06f84c3dc1ea9cf46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "756622199cf1c741ae11b6085da177736bef05bed6c36fb06f84c3dc1ea9cf46", kill_on_drop: false }`
[INFO] [stdout] 756622199cf1c741ae11b6085da177736bef05bed6c36fb06f84c3dc1ea9cf46