[INFO] cloning repository faern/forkjoin-benchmarking
[INFO] running `"git" "clone" "--bare" "git://github.com/faern/forkjoin-benchmarking.git" "work/cache/sources/gh/faern/forkjoin-benchmarking"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/faern/forkjoin-benchmarking'...
[INFO] running `"git" "clone" "work/cache/sources/gh/faern/forkjoin-benchmarking" "work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/faern/forkjoin-benchmarking"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/faern/forkjoin-benchmarking'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/faern/forkjoin-benchmarking" "work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/faern/forkjoin-benchmarking"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/faern/forkjoin-benchmarking'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2871e809b286229b2df81d61813a4c523c726952
[INFO] sha for GitHub repo faern/forkjoin-benchmarking: 2871e809b286229b2df81d61813a4c523c726952
[INFO] validating manifest of faern/forkjoin-benchmarking on toolchain master#c0086b9e8972fef9fd4af24bae20d45021ed06c6
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of faern/forkjoin-benchmarking on toolchain try#290ac7b29f41ff9fa5232f9a1116ea71a3501063
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+290ac7b29f41ff9fa5232f9a1116ea71a3501063-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing faern/forkjoin-benchmarking
[INFO] finished frobbing faern/forkjoin-benchmarking
[INFO] frobbed toml for faern/forkjoin-benchmarking written to work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/faern/forkjoin-benchmarking/Cargo.toml
[INFO] started frobbing faern/forkjoin-benchmarking
[INFO] finished frobbing faern/forkjoin-benchmarking
[INFO] frobbed toml for faern/forkjoin-benchmarking written to work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/faern/forkjoin-benchmarking/Cargo.toml
[INFO] crate faern/forkjoin-benchmarking has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Updating git repository `https://github.com/faern/criterion.rs`
[INFO] [stderr]     Updating git repository `https://github.com/faern/forkjoin`
[INFO] [stderr]     Updating git repository `https://github.com/rust-lang/log`
[INFO] [stderr]     Updating git repository `https://github.com/rust-lang/rustc-serialize`
[INFO] [stderr]     Updating git repository `https://github.com/japaric/simplot.rs`
[INFO] [stderr]     Updating git repository `https://github.com/japaric/space.rs`
[INFO] [stderr]     Updating git repository `https://github.com/japaric/stats.rs`
[INFO] [stderr]     Updating git repository `https://github.com/faern/rust-scheduler`
[INFO] [stderr]     Updating git repository `https://github.com/japaric/cast.rs`
[INFO] [stderr]     Updating git repository `https://github.com/japaric/zip.rs`
[INFO] [stderr]     Updating git repository `https://github.com/japaric/float.rs`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/faern/forkjoin-benchmarking/Cargo.lock needs to be updated but --locked was passed to prevent this
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed