[INFO] fetching crate webapp-frontend 1.0.0...
[INFO] checking webapp-frontend-1.0.0 against beta for pr-78714
[INFO] extracting crate webapp-frontend 1.0.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate webapp-frontend 1.0.0 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate webapp-frontend 1.0.0
[INFO] finished tweaking crates.io crate webapp-frontend 1.0.0
[INFO] tweaked toml for crates.io crate webapp-frontend 1.0.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "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" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f8e36b07d34a9e1dfbd6be82a8ffc52cd9d89b08ad203232b0c65f559286fe63
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "f8e36b07d34a9e1dfbd6be82a8ffc52cd9d89b08ad203232b0c65f559286fe63", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f8e36b07d34a9e1dfbd6be82a8ffc52cd9d89b08ad203232b0c65f559286fe63", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f8e36b07d34a9e1dfbd6be82a8ffc52cd9d89b08ad203232b0c65f559286fe63", kill_on_drop: false }`
[INFO] [stdout] f8e36b07d34a9e1dfbd6be82a8ffc52cd9d89b08ad203232b0c65f559286fe63
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=forbid" "-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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9ab81dd3b21cf7395078d7ad1e1b4ad6f256c7345ce17bd6ce3da6d4a1df61bb
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "9ab81dd3b21cf7395078d7ad1e1b4ad6f256c7345ce17bd6ce3da6d4a1df61bb", kill_on_drop: false }`
[INFO] [stderr]    Compiling stdweb-internal-runtime v0.1.5
[INFO] [stderr]    Compiling base-x v0.2.8
[INFO] [stderr]    Compiling sha1 v0.6.0
[INFO] [stderr]    Compiling sass-sys v0.4.21
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling serde_json v1.0.59
[INFO] [stderr]    Compiling stdweb v0.4.20
[INFO] [stderr]    Compiling toml v0.5.7
[INFO] [stderr]    Compiling stdweb-derive v0.5.3
[INFO] [stderr]     Checking bincode v1.0.1
[INFO] [stderr]     Checking serde_cbor v0.9.0
[INFO] [stderr]     Checking webapp v1.0.0
[INFO] [stderr] error: could not compile `serde_json`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name serde_json --edition=2018 /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_json-1.0.59/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="std"' -C metadata=875aefc4eba9e109 -C extra-filename=-875aefc4eba9e109 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern itoa=/opt/rustwide/target/debug/deps/libitoa-2e05c866ee66a047.rmeta --extern ryu=/opt/rustwide/target/debug/deps/libryu-f59829dd55cb0771.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-1c7f0752128cb46c.rmeta --cap-lints allow --cap-lints=forbid --cfg limb_width_64` (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" "9ab81dd3b21cf7395078d7ad1e1b4ad6f256c7345ce17bd6ce3da6d4a1df61bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ab81dd3b21cf7395078d7ad1e1b4ad6f256c7345ce17bd6ce3da6d4a1df61bb", kill_on_drop: false }`
[INFO] [stdout] 9ab81dd3b21cf7395078d7ad1e1b4ad6f256c7345ce17bd6ce3da6d4a1df61bb