[INFO] updating cached repository https://github.com/paritytech/parity-ethereum
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/paritytech/parity-ethereum
[INFO] [stderr]  - [deleted]             (none)     -> ao-ununroll-ethash
[INFO] [stderr]  - [deleted]             (none)     -> dp/chore/new-ethereum-consensus-tests
[INFO] [stderr]  * [new branch]          SwitchFromEthKeyToCrypto -> SwitchFromEthKeyToCrypto
[INFO] [stderr]    262728831..d9201aa6f  master                   -> master
[INFO] [stderr]  + 60546e7ad...6d3fce599 na-builtin-refactor      -> na-builtin-refactor  (forced update)
[INFO] [stderr]    8a9293647..42b3589e2  seun-simd-eip-152        -> seun-simd-eip-152
[INFO] [stderr]  * [new branch]          v2.5.9-stable            -> v2.5.9-stable
[INFO] [stderr]  * [new branch]          v2.6.4-beta              -> v2.6.4-beta
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d9201aa6f2a03471c88f8c5638a7abe93d0db57c
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/cargo-home/bin/cargo" "+b19afc12c4f781e95f168f2fdea339c972f14ae2-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.