[INFO] updating cached repository meh/spork
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/meh/spork
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/meh/spork" "work/ex/beta-1.38-1/sources/1.37.0/gh/meh/spork"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/meh/spork'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/meh/spork" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/meh/spork"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/meh/spork'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cd10997d7cedf0c6a7f14962fb6c87ee462abf19
[INFO] sha for GitHub repo meh/spork: cd10997d7cedf0c6a7f14962fb6c87ee462abf19
[INFO] validating manifest of meh/spork 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 meh/spork 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 meh/spork
[INFO] finished frobbing meh/spork
[INFO] frobbed toml for meh/spork written to work/ex/beta-1.38-1/sources/1.37.0/gh/meh/spork/Cargo.toml
[INFO] started frobbing meh/spork
[INFO] finished frobbing meh/spork
[INFO] frobbed toml for meh/spork written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/meh/spork/Cargo.toml
[INFO] crate meh/spork 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: checksum for `xcb-util v0.2.0` changed between lock files
[INFO] [stderr] 
[INFO] [stderr] this could be indicative of a few possible errors:
[INFO] [stderr] 
[INFO] [stderr]     * the lock file is corrupt
[INFO] [stderr]     * a replacement source in use (e.g., a mirror) returned a different checksum
[INFO] [stderr]     * the source itself may be corrupt in one way or another
[INFO] [stderr] 
[INFO] [stderr] unable to verify that `xcb-util v0.2.0` is the same as when the lockfile was generated
[INFO] [stderr] 
[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