[INFO] updating cached repository jamespharaoh/btrfs-omega13
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jamespharaoh/btrfs-omega13
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jamespharaoh/btrfs-omega13" "work/ex/beta-1.38-1/sources/1.37.0/gh/jamespharaoh/btrfs-omega13"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jamespharaoh/btrfs-omega13'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jamespharaoh/btrfs-omega13" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jamespharaoh/btrfs-omega13"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jamespharaoh/btrfs-omega13'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5c150bb1294d13d8f5026eba1e5f271515166c8e
[INFO] sha for GitHub repo jamespharaoh/btrfs-omega13: 5c150bb1294d13d8f5026eba1e5f271515166c8e
[INFO] validating manifest of jamespharaoh/btrfs-omega13 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 jamespharaoh/btrfs-omega13 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 jamespharaoh/btrfs-omega13
[INFO] finished frobbing jamespharaoh/btrfs-omega13
[INFO] frobbed toml for jamespharaoh/btrfs-omega13 written to work/ex/beta-1.38-1/sources/1.37.0/gh/jamespharaoh/btrfs-omega13/Cargo.toml
[INFO] started frobbing jamespharaoh/btrfs-omega13
[INFO] finished frobbing jamespharaoh/btrfs-omega13
[INFO] frobbed toml for jamespharaoh/btrfs-omega13 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jamespharaoh/btrfs-omega13/Cargo.toml
[INFO] crate jamespharaoh/btrfs-omega13 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] error: failed to load source for a dependency on `btrfs`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jamespharaoh/rust-btrfs
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to read `/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jamespharaoh/rust-btrfs/Cargo.toml`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   No such file or directory (os error 2)
[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