[INFO] crate firebase-db-access 0.1.2 is already in cache
[INFO] extracting crate firebase-db-access 0.1.2 into work/ex/pr-60620/sources/master#ef01f29964df207f181bd5bcf236e41372a17273/reg/firebase-db-access/0.1.2
[INFO] extracting crate firebase-db-access 0.1.2 into work/ex/pr-60620/sources/try#a7cff45e655f886da150e206c7acbe984df4ab71/reg/firebase-db-access/0.1.2
[INFO] validating manifest of firebase-db-access-0.1.2 on toolchain master#ef01f29964df207f181bd5bcf236e41372a17273
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+ef01f29964df207f181bd5bcf236e41372a17273-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of firebase-db-access-0.1.2 on toolchain try#a7cff45e655f886da150e206c7acbe984df4ab71
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a7cff45e655f886da150e206c7acbe984df4ab71-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing firebase-db-access-0.1.2
[INFO] finished frobbing firebase-db-access-0.1.2
[INFO] frobbed toml for firebase-db-access-0.1.2 written to work/ex/pr-60620/sources/master#ef01f29964df207f181bd5bcf236e41372a17273/reg/firebase-db-access/0.1.2/Cargo.toml
[INFO] started frobbing firebase-db-access-0.1.2
[INFO] finished frobbing firebase-db-access-0.1.2
[INFO] frobbed toml for firebase-db-access-0.1.2 written to work/ex/pr-60620/sources/try#a7cff45e655f886da150e206c7acbe984df4ab71/reg/firebase-db-access/0.1.2/Cargo.toml
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+ef01f29964df207f181bd5bcf236e41372a17273-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a7cff45e655f886da150e206c7acbe984df4ab71-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+ef01f29964df207f181bd5bcf236e41372a17273-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a7cff45e655f886da150e206c7acbe984df4ab71-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking firebase-db-access-0.1.2 against master#ef01f29964df207f181bd5bcf236e41372a17273 for pr-60620
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60620/worker-5/master#ef01f29964df207f181bd5bcf236e41372a17273:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60620/sources/master#ef01f29964df207f181bd5bcf236e41372a17273/reg/firebase-db-access/0.1.2:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+ef01f29964df207f181bd5bcf236e41372a17273-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 1f2f353e00e05716b26c6109d0c3b476cad864830659de5af96a7f7d85b77a12
[INFO] running `"docker" "start" "-a" "1f2f353e00e05716b26c6109d0c3b476cad864830659de5af96a7f7d85b77a12"`
[INFO] [stderr] error: failed to acquire package cache lock
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to open: /opt/crater/cargo-home/.package-cache
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Read-only file system (os error 30)
[INFO] running `"docker" "inspect" "1f2f353e00e05716b26c6109d0c3b476cad864830659de5af96a7f7d85b77a12"`
[INFO] running `"docker" "rm" "-f" "1f2f353e00e05716b26c6109d0c3b476cad864830659de5af96a7f7d85b77a12"`
[INFO] [stdout] 1f2f353e00e05716b26c6109d0c3b476cad864830659de5af96a7f7d85b77a12