[INFO] fetching crate libmount 0.1.15...
[INFO] building libmount-0.1.15 against master#d5c88c22807925c189328ef9d923c5d2b11a95b8 for pr-87066-3
[INFO] extracting crate libmount 0.1.15 into /workspace/builds/worker-19/source
[INFO] validating manifest of crates.io crate libmount 0.1.15 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 libmount 0.1.15
[INFO] finished tweaking crates.io crate libmount 0.1.15
[INFO] tweaked toml for crates.io crate libmount 0.1.15 written to /workspace/builds/worker-19/source/Cargo.toml
[INFO] crate crates.io crate libmount 0.1.15 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d5c88c22807925c189328ef9d923c5d2b11a95b8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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] [stdout] 0b1779c7d71c27a641a597de546d46fbc896f37d5d378f8aae848d18ebead3d9
[INFO] running `Command { std: "docker" "start" "-a" "0b1779c7d71c27a641a597de546d46fbc896f37d5d378f8aae848d18ebead3d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0b1779c7d71c27a641a597de546d46fbc896f37d5d378f8aae848d18ebead3d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b1779c7d71c27a641a597de546d46fbc896f37d5d378f8aae848d18ebead3d9", kill_on_drop: false }`
[INFO] [stdout] 0b1779c7d71c27a641a597de546d46fbc896f37d5d378f8aae848d18ebead3d9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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] [stdout] e0b7f65a227afb0ebe3fce078262c3fe95fbe203de4f23cc25b98d0553962dc8
[INFO] running `Command { std: "docker" "start" "-a" "e0b7f65a227afb0ebe3fce078262c3fe95fbe203de4f23cc25b98d0553962dc8", 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" "e0b7f65a227afb0ebe3fce078262c3fe95fbe203de4f23cc25b98d0553962dc8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e0b7f65a227afb0ebe3fce078262c3fe95fbe203de4f23cc25b98d0553962dc8", kill_on_drop: false }`
[INFO] [stdout] e0b7f65a227afb0ebe3fce078262c3fe95fbe203de4f23cc25b98d0553962dc8