[INFO] updating cached repository redox-os/netstack
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/redox-os/netstack
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/redox-os/netstack" "work/ex/beta-1.38-1/sources/1.37.0/gh/redox-os/netstack"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/redox-os/netstack'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/redox-os/netstack" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/redox-os/netstack"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/redox-os/netstack'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2079856d97ae218d01f32be4b881360765b2b51d
[INFO] sha for GitHub repo redox-os/netstack: 2079856d97ae218d01f32be4b881360765b2b51d
[INFO] validating manifest of redox-os/netstack on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of redox-os/netstack on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing redox-os/netstack
[INFO] removed path dependency smoltcp from redox-os/netstack
[INFO] finished frobbing redox-os/netstack
[INFO] frobbed toml for redox-os/netstack written to work/ex/beta-1.38-1/sources/1.37.0/gh/redox-os/netstack/Cargo.toml
[INFO] started frobbing redox-os/netstack
[INFO] removed path dependency smoltcp from redox-os/netstack
[INFO] finished frobbing redox-os/netstack
[INFO] frobbed toml for redox-os/netstack written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/redox-os/netstack/Cargo.toml
[INFO] crate redox-os/netstack already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Updating git repository `https://gitlab.redox-os.org/redox-os/mio-uds`
[INFO] [stderr] error: failed to load source for a dependency on `mio-uds`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://gitlab.redox-os.org/redox-os/mio-uds#2936ef82
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   revspec '2936ef82070ea0c4aa8a7360455b8c512d8c88c0' not found; class=Reference (4); code=NotFound (-3)
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed