[INFO] updating cached repository https://github.com/sebastianblunt/cargo-6999
[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] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ff3ec8066738b9f35c9c2d0a8498a0badac456f1
[INFO] testing sebastianblunt/cargo-6999 against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsebastianblunt%2Fcargo-6999" "work/builds/worker-5/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sebastianblunt/cargo-6999 on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/sebastianblunt/cargo-6999
[INFO] finished tweaking git repo https://github.com/sebastianblunt/cargo-6999
[INFO] tweaked toml for git repo https://github.com/sebastianblunt/cargo-6999 written to work/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/sebastianblunt/cargo-6999 already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-5/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] 82811f387b4f7b9a0aad59274fc4a226e6fcae82dd919c809f97e8cbc384870e
[INFO] running `"docker" "start" "-a" "82811f387b4f7b9a0aad59274fc4a226e6fcae82dd919c809f97e8cbc384870e"`
[INFO] [stderr]    Unpacking stable_deref_trait v1.1.1 (registry `/opt/rustwide/workdir/vendor`)
[INFO] [stderr] error: failed to download `stable_deref_trait v1.1.1`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   unable to get packages from source
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to download replaced source registry `https://github.com/rust-lang/crates.io-index`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to unpack package `stable_deref_trait v1.1.1 (registry `/opt/rustwide/workdir/vendor`)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to create directory `/opt/rustwide/cargo-home/registry/src/-7880dd3ed21be0b8/stable_deref_trait-1.1.1`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Read-only file system (os error 30)
[INFO] running `"docker" "inspect" "82811f387b4f7b9a0aad59274fc4a226e6fcae82dd919c809f97e8cbc384870e"`
[INFO] running `"docker" "rm" "-f" "82811f387b4f7b9a0aad59274fc4a226e6fcae82dd919c809f97e8cbc384870e"`
[INFO] [stdout] 82811f387b4f7b9a0aad59274fc4a226e6fcae82dd919c809f97e8cbc384870e