[INFO] fetching crate peepmatic 0.66.0...
[INFO] testing peepmatic-0.66.0 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate peepmatic 0.66.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate peepmatic 0.66.0 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate peepmatic 0.66.0
[INFO] finished tweaking crates.io crate peepmatic 0.66.0
[INFO] tweaked toml for crates.io crate peepmatic 0.66.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded peepmatic-runtime v0.2.0
[INFO] [stderr]   Downloaded z3 v0.6.0
[INFO] [stderr]   Downloaded z3-sys v0.6.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 4a522b6052a3a3142254c0ac52454a33c830f1f32dff43b57afb4bf5a90c37d2
[INFO] running `Command { std: "docker" "start" "-a" "4a522b6052a3a3142254c0ac52454a33c830f1f32dff43b57afb4bf5a90c37d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4a522b6052a3a3142254c0ac52454a33c830f1f32dff43b57afb4bf5a90c37d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a522b6052a3a3142254c0ac52454a33c830f1f32dff43b57afb4bf5a90c37d2", kill_on_drop: false }`
[INFO] [stdout] 4a522b6052a3a3142254c0ac52454a33c830f1f32dff43b57afb4bf5a90c37d2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 08f3a57da2d9f630c2d33719a0901a5b775c5f0b9381ca64c2173ea633b732e4
[INFO] running `Command { std: "docker" "start" "-a" "08f3a57da2d9f630c2d33719a0901a5b775c5f0b9381ca64c2173ea633b732e4", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.57
[INFO] [stderr]    Compiling leb128 v0.2.4
[INFO] [stderr]    Compiling z3-sys v0.6.3
[INFO] [stderr]    Compiling wast v15.0.0
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]    Compiling thiserror-impl v1.0.23
[INFO] [stderr]    Compiling peepmatic-macro v0.2.0
[INFO] [stderr]    Compiling thiserror v1.0.23
[INFO] [stderr] error: could not compile `serde_derive`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name serde_derive /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_derive-1.0.118/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type proc-macro --emit=dep-info,link -C prefer-dynamic -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' -C metadata=7d7484301384d142 -C extra-filename=-7d7484301384d142 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-fc674c02767ecd53.rlib --extern quote=/opt/rustwide/target/debug/deps/libquote-c80413db87535708.rlib --extern syn=/opt/rustwide/target/debug/deps/libsyn-338ac6880d6c9514.rlib --extern proc_macro --cap-lints allow --cap-lints=warn --cfg underscore_consts` (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" "08f3a57da2d9f630c2d33719a0901a5b775c5f0b9381ca64c2173ea633b732e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "08f3a57da2d9f630c2d33719a0901a5b775c5f0b9381ca64c2173ea633b732e4", kill_on_drop: false }`
[INFO] [stdout] 08f3a57da2d9f630c2d33719a0901a5b775c5f0b9381ca64c2173ea633b732e4