[INFO] updating cached repository alexander-akhmetov/mos
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/alexander-akhmetov/mos
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/alexander-akhmetov/mos" "work/ex/beta-1.38-1/sources/1.37.0/gh/alexander-akhmetov/mos"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/alexander-akhmetov/mos'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/alexander-akhmetov/mos" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/alexander-akhmetov/mos"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/alexander-akhmetov/mos'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] de631345ab4661f48759c8874c40fc41fc9f7fc4
[INFO] sha for GitHub repo alexander-akhmetov/mos: de631345ab4661f48759c8874c40fc41fc9f7fc4
[INFO] validating manifest of alexander-akhmetov/mos 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 alexander-akhmetov/mos 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 alexander-akhmetov/mos
[INFO] removed path dependency librust from alexander-akhmetov/mos
[INFO] finished frobbing alexander-akhmetov/mos
[INFO] frobbed toml for alexander-akhmetov/mos written to work/ex/beta-1.38-1/sources/1.37.0/gh/alexander-akhmetov/mos/Cargo.toml
[INFO] started frobbing alexander-akhmetov/mos
[INFO] removed path dependency librust from alexander-akhmetov/mos
[INFO] finished frobbing alexander-akhmetov/mos
[INFO] frobbed toml for alexander-akhmetov/mos written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/alexander-akhmetov/mos/Cargo.toml
[INFO] crate alexander-akhmetov/mos 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 `ssh://git@gitlab.com/akhmetov/tar.git`
[INFO] [stderr] error: failed to load source for a dependency on `tar`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update ssh://git@gitlab.com/akhmetov/tar.git?tag=0.3.0#ffa17ee0
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to fetch into /mnt/big/crater/work/local/cargo-home/git/db/tar-ba2164b4d1f7fef3
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to authenticate when downloading repository
[INFO] [stderr] attempted ssh-agent authentication, but none of the usernames `git` succeeded
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   error authenticating: no auth sock variable; class=Ssh (23)
[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