[INFO] updating cached repository https://github.com/paritytech/polkadot
[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/polkadot
[INFO] [stderr]    061fffee..c1bee549  gav-parathreads -> gav-parathreads
[INFO] [stderr]    577a5a2d..a551f849  master          -> master
[INFO] [stderr]  * [new branch]        v0.6            -> v0.6
[INFO] [stderr]  * [new tag]           v0.6.0          -> v0.6.0
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a551f849d0fc98b228aaffc81436a109514a4e20
[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.