[INFO] crate microsalt 0.2.21 is already in cache
[INFO] extracting crate microsalt 0.2.21 into work/ex/pr-60620-1/sources/master#ef01f29964df207f181bd5bcf236e41372a17273/reg/microsalt/0.2.21
[INFO] extracting crate microsalt 0.2.21 into work/ex/pr-60620-1/sources/try#a7cff45e655f886da150e206c7acbe984df4ab71/reg/microsalt/0.2.21
[INFO] validating manifest of microsalt-0.2.21 on toolchain master#ef01f29964df207f181bd5bcf236e41372a17273
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+ef01f29964df207f181bd5bcf236e41372a17273-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of microsalt-0.2.21 on toolchain try#a7cff45e655f886da150e206c7acbe984df4ab71
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a7cff45e655f886da150e206c7acbe984df4ab71-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing microsalt-0.2.21
[INFO] finished frobbing microsalt-0.2.21
[INFO] frobbed toml for microsalt-0.2.21 written to work/ex/pr-60620-1/sources/master#ef01f29964df207f181bd5bcf236e41372a17273/reg/microsalt/0.2.21/Cargo.toml
[INFO] started frobbing microsalt-0.2.21
[INFO] finished frobbing microsalt-0.2.21
[INFO] frobbed toml for microsalt-0.2.21 written to work/ex/pr-60620-1/sources/try#a7cff45e655f886da150e206c7acbe984df4ab71/reg/microsalt/0.2.21/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+ef01f29964df207f181bd5bcf236e41372a17273-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a7cff45e655f886da150e206c7acbe984df4ab71-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+ef01f29964df207f181bd5bcf236e41372a17273-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a7cff45e655f886da150e206c7acbe984df4ab71-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking microsalt-0.2.21 against try#a7cff45e655f886da150e206c7acbe984df4ab71 for pr-60620-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-60620-1/worker-3/try#a7cff45e655f886da150e206c7acbe984df4ab71:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-60620-1/sources/try#a7cff45e655f886da150e206c7acbe984df4ab71/reg/microsalt/0.2.21:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/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" "+a7cff45e655f886da150e206c7acbe984df4ab71-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 9ac840d5772ff6725d4f69488305e4ba85422f4ea229d2578d42a3466f85f41f
[INFO] running `"docker" "start" "-a" "9ac840d5772ff6725d4f69488305e4ba85422f4ea229d2578d42a3466f85f41f"`
[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" "9ac840d5772ff6725d4f69488305e4ba85422f4ea229d2578d42a3466f85f41f"`
[INFO] running `"docker" "rm" "-f" "9ac840d5772ff6725d4f69488305e4ba85422f4ea229d2578d42a3466f85f41f"`
[INFO] [stdout] 9ac840d5772ff6725d4f69488305e4ba85422f4ea229d2578d42a3466f85f41f