Dec 19 16:34:22.521 INFO checking gf4t47/rust_os against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 16:34:22.521 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-0/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/gf4t47/rust_os:/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 16:34:22.920 INFO [stdout] 91fcc230ce5c84143907af2b807068176483491447de27bd551924f45845f37d
Dec 19 16:34:22.922 INFO running `"docker" "start" "-a" "91fcc230ce5c84143907af2b807068176483491447de27bd551924f45845f37d"`
Dec 19 16:34:24.916 INFO [stderr]     Checking volatile v0.2.5
Dec 19 16:34:24.920 INFO [stderr]     Checking x86_64 v0.2.14
Dec 19 16:34:24.924 INFO [stderr]     Checking array-init v0.0.3
Dec 19 16:34:28.343 INFO [stderr]     Checking uart_16550 v0.1.0
Dec 19 16:34:28.997 INFO [stderr]     Checking rust_os v0.1.0 (/opt/crater/workdir)
Dec 19 16:34:32.676 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.85s
Dec 19 16:34:33.744 INFO running `"docker" "inspect" "91fcc230ce5c84143907af2b807068176483491447de27bd551924f45845f37d"`
Dec 19 16:34:34.006 INFO running `"docker" "rm" "-f" "91fcc230ce5c84143907af2b807068176483491447de27bd551924f45845f37d"`
Dec 19 16:34:34.300 INFO [stdout] 91fcc230ce5c84143907af2b807068176483491447de27bd551924f45845f37d