[INFO] updating cached repository https://github.com/paritytech/parity-ethereum
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/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)     -> dp/chore/update-kvdb-rocksdb-and-h2
[INFO] [stderr]  - [deleted]             (none)     -> sccache-redis
[INFO] [stderr]  - [deleted]             (none)     -> seun-simd-eip-152
[INFO] [stderr]  - [deleted]             (none)     -> v2.5.9-stable
[INFO] [stderr]  - [deleted]             (none)     -> v2.6.4-beta
[INFO] [stderr]    b7b1484f2..1a62f5a08  beta                -> beta
[INFO] [stderr]  * [new branch]          dp/fix/improve-handling-of-rpc-calls-with-pending -> dp/fix/improve-handling-of-rpc-calls-with-pending
[INFO] [stderr]    7c5fd042f..b31bff5ce  master              -> master
[INFO] [stderr]  + 04926f529...45104859c na-builtin-refactor -> na-builtin-refactor  (forced update)
[INFO] [stderr]  * [new branch]          na-ethc-chainspec-validation -> na-ethc-chainspec-validation
[INFO] [stderr]    c52a6c8fb..5ee54b729  stable              -> stable
[INFO] [stderr]  * [new tag]             v2.5.9              -> v2.5.9
[INFO] [stderr]  * [new tag]             v2.6.4              -> v2.6.4
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b31bff5ce2b80a1ef1c6789a330af544552c5176
[ERROR] this task or one of its parent failed!
[ERROR] command `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.