[INFO] cloning repository https://github.com/flatcar-linux/coreos-metadata
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/flatcar-linux/coreos-metadata" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fflatcar-linux%2Fcoreos-metadata", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fflatcar-linux%2Fcoreos-metadata'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 984730dafdfd5aa536a3a12ee36531829b33b0a9
[INFO] [stderr] warning: refname 'HEAD' is ambiguous.
[INFO] testing flatcar-linux/coreos-metadata against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fflatcar-linux%2Fcoreos-metadata" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/flatcar-linux/coreos-metadata on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/flatcar-linux/coreos-metadata
[INFO] finished tweaking git repo https://github.com/flatcar-linux/coreos-metadata
[INFO] tweaked toml for git repo https://github.com/flatcar-linux/coreos-metadata written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/flatcar-linux/coreos-metadata already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ead6ee6666bd15c070fba6177efc5b6feec5c6d7e10e95595b85d62913ee186c
[INFO] running `Command { std: "docker" "start" "-a" "ead6ee6666bd15c070fba6177efc5b6feec5c6d7e10e95595b85d62913ee186c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ead6ee6666bd15c070fba6177efc5b6feec5c6d7e10e95595b85d62913ee186c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ead6ee6666bd15c070fba6177efc5b6feec5c6d7e10e95595b85d62913ee186c", kill_on_drop: false }`
[INFO] [stdout] ead6ee6666bd15c070fba6177efc5b6feec5c6d7e10e95595b85d62913ee186c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f1eb177743d9a326387b6e41fffacabead5ebe0b10bca104a4f77b588f5deb69
[INFO] running `Command { std: "docker" "start" "-a" "f1eb177743d9a326387b6e41fffacabead5ebe0b10bca104a4f77b588f5deb69", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.47
[INFO] [stderr]    Compiling rand_core v0.3.0
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling futures v0.1.25
[INFO] [stderr]    Compiling slab v0.4.1
[INFO] [stderr]    Compiling arrayvec v0.4.9
[INFO] [stderr]    Compiling unicode-xid v0.0.3
[INFO] [stderr]    Compiling serde v1.0.90
[INFO] [stderr]    Compiling cc v1.0.26
[INFO] [stderr]    Compiling siphasher v0.2.3
[INFO] [stderr]    Compiling typenum v1.10.0
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling itoa v0.4.3
[INFO] [stderr]    Compiling byte-tools v0.3.0
[INFO] [stderr]    Compiling proc-macro2 v0.4.24
[INFO] [stderr]    Compiling httparse v1.3.3
[INFO] [stderr]    Compiling slog v2.4.1
[INFO] [stderr]    Compiling pnet_base v0.22.0
[INFO] [stderr]    Compiling openssl v0.10.20
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling foreign-types-shared v0.1.1
[INFO] [stderr]    Compiling unicode-normalization v0.1.7
[INFO] [stderr]    Compiling crc32fast v1.1.2
[INFO] [stderr]    Compiling indexmap v1.0.2
[INFO] [stderr]    Compiling try-lock v0.2.2
[INFO] [stderr]    Compiling string v0.1.2
[INFO] [stderr]    Compiling native-tls v0.2.2
[INFO] [stderr]    Compiling encoding_rs v0.8.13
[INFO] [stderr]    Compiling openssl-probe v0.1.2
[INFO] [stderr]    Compiling opaque-debug v0.2.1
[INFO] [stderr]    Compiling bitflags v0.7.0
[INFO] [stderr]    Compiling pnet v0.22.0
[INFO] [stderr]    Compiling safemem v0.3.0
[INFO] [stderr]    Compiling remove_dir_all v0.5.1
[INFO] [stderr]    Compiling fake-simd v0.1.2
[INFO] [stderr]    Compiling adler32 v1.0.3
[INFO] [stderr]    Compiling dtoa v0.4.3
[INFO] [stderr]    Compiling crossbeam v0.2.12
[INFO] [stderr]    Compiling take_mut v0.2.2
[INFO] [stderr]    Compiling error-chain v0.12.0
[INFO] [stderr]    Compiling lazy_static v0.2.11
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling byteorder v1.3.1
[INFO] [stderr]    Compiling crossbeam-utils v0.6.3
[INFO] [stderr]    Compiling syntex_pos v0.42.0
[INFO] [stderr]    Compiling regex-syntax v0.5.6
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling ryu v0.2.7
[INFO] [stderr]    Compiling nix v0.13.0
[INFO] [stderr]    Compiling smallvec v0.6.7
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling lock_api v0.1.5
[INFO] [stderr]    Compiling xml-rs v0.3.6
[INFO] [stderr]    Compiling block-padding v0.1.2
[INFO] [stderr]    Compiling pnet_macros_support v0.22.0
[INFO] [stderr]    Compiling rand_core v0.2.2
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rand_xorshift v0.1.0
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling foreign-types v0.3.2
[INFO] [stderr]    Compiling memchr v2.1.2
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]    Compiling unicase v2.2.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling term v0.5.1
[INFO] [stderr]    Compiling base64 v0.10.1
[INFO] [stderr]    Compiling base64 v0.9.3
[INFO] [stderr]    Compiling libflate v0.1.19
[INFO] [stderr]    Compiling slog-async v2.3.0
[INFO] [stderr]    Compiling slog-scope v4.0.1
[INFO] [stderr]    Compiling tokio-executor v0.1.5
[INFO] [stderr]    Compiling want v0.0.6
[INFO] [stderr]    Compiling idna v0.1.5
[INFO] [stderr]    Compiling quote v0.6.10
[INFO] [stderr]    Compiling rand v0.5.5
[INFO] [stderr]    Compiling iovec v0.1.2
[INFO] [stderr]    Compiling num_cpus v1.9.0
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling syntex_errors v0.42.0
[INFO] [stderr]    Compiling time v0.1.41
[INFO] [stderr]    Compiling pnet_sys v0.22.0
[INFO] [stderr]    Compiling isatty v0.1.9
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling rand v0.4.3
[INFO] [stderr]    Compiling hostname v0.1.5
[INFO] [stderr]    Compiling users v0.8.1
[INFO] [stderr]    Compiling parking_lot_core v0.3.1
[INFO] [stderr]    Compiling rand_pcg v0.1.1
[INFO] [stderr]    Compiling rand_chacha v0.1.0
[INFO] [stderr]    Compiling rand v0.6.1
[INFO] [stderr]    Compiling openssl-sys v0.9.43
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.0
[INFO] [stderr]    Compiling tokio-timer v0.2.8
[INFO] [stderr]    Compiling tokio-current-thread v0.1.4
[INFO] [stderr]    Compiling futures-cpupool v0.1.8
[INFO] [stderr]    Compiling generic-array v0.12.0
[INFO] [stderr]    Compiling bytes v0.4.11
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling crossbeam-deque v0.6.3
[INFO] [stderr]    Compiling syn v0.15.23
[INFO] [stderr]    Compiling mio v0.6.16
[INFO] [stderr]    Compiling url v1.7.2
[INFO] [stderr]    Compiling aho-corasick v0.6.9
[INFO] [stderr]    Compiling phf_shared v0.7.23
[INFO] [stderr]    Compiling mime v0.3.13
[INFO] [stderr]    Compiling tokio-io v0.1.10
[INFO] [stderr]    Compiling http v0.1.14
[INFO] [stderr]    Compiling uuid v0.7.1
[INFO] [stderr] error: could not compile `regex-syntax`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name regex_syntax /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/regex-syntax-0.5.6/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 -C metadata=7328c1fa6ed71734 -C extra-filename=-7328c1fa6ed71734 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern ucd_util=/opt/rustwide/target/debug/deps/libucd_util-2d9b96822d3aa814.rmeta --cap-lints allow --cap-lints=warn` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "f1eb177743d9a326387b6e41fffacabead5ebe0b10bca104a4f77b588f5deb69", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1eb177743d9a326387b6e41fffacabead5ebe0b10bca104a4f77b588f5deb69", kill_on_drop: false }`
[INFO] [stdout] f1eb177743d9a326387b6e41fffacabead5ebe0b10bca104a4f77b588f5deb69