[INFO] fetching crate swasm-utils 0.6.1...
[INFO] checking swasm-utils-0.6.1 against master#fc81ad22c453776de16acf9938976930cf8c9401 for pr-77325
[INFO] extracting crate swasm-utils 0.6.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate swasm-utils 0.6.1 on toolchain fc81ad22c453776de16acf9938976930cf8c9401
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+fc81ad22c453776de16acf9938976930cf8c9401" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate swasm-utils 0.6.1
[INFO] finished tweaking crates.io crate swasm-utils 0.6.1
[INFO] tweaked toml for crates.io crate swasm-utils 0.6.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+fc81ad22c453776de16acf9938976930cf8c9401" "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" "+fc81ad22c453776de16acf9938976930cf8c9401" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+fc81ad22c453776de16acf9938976930cf8c9401" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0b2b2781d547d81c0fee26748711513da085231985f09f7c845cee3d27b4c9e4
[INFO] running `Command { std: "docker" "start" "-a" "0b2b2781d547d81c0fee26748711513da085231985f09f7c845cee3d27b4c9e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0b2b2781d547d81c0fee26748711513da085231985f09f7c845cee3d27b4c9e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b2b2781d547d81c0fee26748711513da085231985f09f7c845cee3d27b4c9e4", kill_on_drop: false }`
[INFO] [stdout] 0b2b2781d547d81c0fee26748711513da085231985f09f7c845cee3d27b4c9e4
[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=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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+fc81ad22c453776de16acf9938976930cf8c9401" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4109c2008c2a387a56646ee99ac9fb91f8c5da8c8a695697ca2fdaae5eda377e
[INFO] running `Command { std: "docker" "start" "-a" "4109c2008c2a387a56646ee99ac9fb91f8c5da8c8a695697ca2fdaae5eda377e", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.73
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]    Compiling cmake v0.1.45
[INFO] [stderr]    Compiling libc v0.2.96
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]     Checking swasm v0.31.3
[INFO] [stderr]    Compiling wabt-sys v0.1.4
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking tempdir v0.3.7
[INFO] [stderr]     Checking swasm-utils v0.6.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/stack_height/mod.rs:236:9
[INFO] [stdout]     |
[INFO] [stdout] 236 |                 let mut opcodes = func_body.code_mut();
[INFO] [stdout]     |                     ----^^^^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling serde_derive v1.0.126
[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-1.0.64/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="std"' -C metadata=50d71afd3f5c4534 -C extra-filename=-50d71afd3f5c4534 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern itoa=/opt/rustwide/target/debug/deps/libitoa-a4020197e260508a.rmeta --extern ryu=/opt/rustwide/target/debug/deps/libryu-aba617353e81db96.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-b8ad89f46bd357ff.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" "4109c2008c2a387a56646ee99ac9fb91f8c5da8c8a695697ca2fdaae5eda377e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4109c2008c2a387a56646ee99ac9fb91f8c5da8c8a695697ca2fdaae5eda377e", kill_on_drop: false }`
[INFO] [stdout] 4109c2008c2a387a56646ee99ac9fb91f8c5da8c8a695697ca2fdaae5eda377e