[INFO] updating cached repository https://github.com/tikv/tikv
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/tikv/tikv
[INFO] [stderr]    5994d418d..e3058403a master                   -> master
[INFO] [stderr]    bc691db17..fe83dbf12 release-3.0              -> release-3.0
[INFO] [stderr]    dcbf45ae8..45016c6ab release-3.1              -> release-3.1
[INFO] [stderr]  * [new branch]        release-3.1.2            -> release-3.1.2
[INFO] [stderr]    2fdb2804b..511c346a4 release-4.0              -> release-4.0
[INFO] [stderr]  * [new branch]        release-4.0-a65815af8f98 -> release-4.0-a65815af8f98
[INFO] [stderr]  * [new tag]           v3.0.15                  -> v3.0.15
[INFO] [stderr]  * [new tag]           v3.1.2                   -> v3.1.2
[INFO] [stderr]  * [new tag]             v4.0.0                   -> v4.0.0
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e3058403a0fc9a96870882bf184ac075223b4642
[ERROR] this task or one of its parent failed!
[ERROR] command `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.