[INFO] fetching crate serde_json 1.0.57...
[INFO] checking serde_json-1.0.57 against master#a874956d940ecb3ed524b6176a171219ac4787ea for pr-76104
[INFO] extracting crate serde_json 1.0.57 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate serde_json 1.0.57 on toolchain a874956d940ecb3ed524b6176a171219ac4787ea
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a874956d940ecb3ed524b6176a171219ac4787ea" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate serde_json 1.0.57
[INFO] finished tweaking crates.io crate serde_json 1.0.57
[INFO] tweaked toml for crates.io crate serde_json 1.0.57 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a874956d940ecb3ed524b6176a171219ac4787ea" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a874956d940ecb3ed524b6176a171219ac4787ea" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+a874956d940ecb3ed524b6176a171219ac4787ea" "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] db765b50ebddb3f176c33657478266430e9375852e5a4d88d0bd9ec89bf53f68
[INFO] running `Command { std: "docker" "start" "-a" "db765b50ebddb3f176c33657478266430e9375852e5a4d88d0bd9ec89bf53f68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "db765b50ebddb3f176c33657478266430e9375852e5a4d88d0bd9ec89bf53f68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db765b50ebddb3f176c33657478266430e9375852e5a4d88d0bd9ec89bf53f68", kill_on_drop: false }`
[INFO] [stdout] db765b50ebddb3f176c33657478266430e9375852e5a4d88d0bd9ec89bf53f68
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+a874956d940ecb3ed524b6176a171219ac4787ea" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9427a5747ea50c65a7fa03c2e69a34591cc93b492d3d48c52fb0f02960b63fd7
[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" "9427a5747ea50c65a7fa03c2e69a34591cc93b492d3d48c52fb0f02960b63fd7", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.41
[INFO] [stderr]    Compiling serde v1.0.116
[INFO] [stderr]    Compiling cc v1.0.60
[INFO] [stderr]    Compiling libc v0.2.77
[INFO] [stderr]    Compiling serde_json v1.0.57
[INFO] [stderr]    Compiling serde_json v1.0.57 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling rustversion v1.0.3
[INFO] [stderr]    Compiling trybuild v1.0.35
[INFO] [stderr]     Checking dissimilar v1.0.2
[INFO] [stderr]    Compiling psm v0.1.11
[INFO] [stderr]    Compiling stacker v0.1.12
[INFO] [stderr]    Compiling serde_derive v1.0.116
[INFO] [stderr]    Compiling automod v0.1.2
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]     Checking serde_bytes v0.11.5
[INFO] [stderr]     Checking serde_stacker v0.1.4
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 50.17s
[INFO] running `Command { std: "docker" "inspect" "9427a5747ea50c65a7fa03c2e69a34591cc93b492d3d48c52fb0f02960b63fd7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9427a5747ea50c65a7fa03c2e69a34591cc93b492d3d48c52fb0f02960b63fd7", kill_on_drop: false }`
[INFO] [stdout] 9427a5747ea50c65a7fa03c2e69a34591cc93b492d3d48c52fb0f02960b63fd7