[INFO] fetching crate mgm 0.5.0-pre.1...
[INFO] checking mgm-0.5.0-pre.1 against master#96df4943409564a187894018f15f795426dc2e1f for pr-118968
[INFO] extracting crate mgm 0.5.0-pre.1 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate mgm 0.5.0-pre.1 on toolchain 96df4943409564a187894018f15f795426dc2e1f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+96df4943409564a187894018f15f795426dc2e1f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mgm 0.5.0-pre.1
[INFO] finished tweaking crates.io crate mgm 0.5.0-pre.1
[INFO] tweaked toml for crates.io crate mgm 0.5.0-pre.1 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+96df4943409564a187894018f15f795426dc2e1f" "generate-lockfile" "--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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+96df4943409564a187894018f15f795426dc2e1f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.