[INFO] cloning repository https://github.com/penick/kafka_hang
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/penick/kafka_hang" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpenick%2Fkafka_hang", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpenick%2Fkafka_hang'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1402b2d82179447f9e7db312660bfc788bad69f8
[INFO] checking penick/kafka_hang against try#87f2ecc56b5f6032b075c8934ebc77f28d57183c for pr-148190
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpenick%2Fkafka_hang" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/penick/kafka_hang
[INFO] finished tweaking git repo https://github.com/penick/kafka_hang
[INFO] tweaked toml for git repo https://github.com/penick/kafka_hang written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/penick/kafka_hang on toolchain 87f2ecc56b5f6032b075c8934ebc77f28d57183c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+87f2ecc56b5f6032b075c8934ebc77f28d57183c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/penick/kafka_hang already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+87f2ecc56b5f6032b075c8934ebc77f28d57183c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Updating git repository `https://github.com/fede1024/rust-rdkafka.git`
[INFO] [stderr]     Updating git submodule `https://github.com/edenhill/librdkafka`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tokio-stream v0.1.11
[INFO] [stderr]   Downloaded doc-comment v0.3.3
[INFO] [stderr]   Downloaded tokio-openssl v0.6.3
[INFO] [stderr]   Downloaded tokio-io v0.1.13
[INFO] [stderr]   Downloaded cxxbridge-flags v1.0.80
[INFO] [stderr]   Downloaded bytes v0.4.12
[INFO] [stderr]   Downloaded sync_wrapper v0.1.1
[INFO] [stderr]   Downloaded stream-cancel v0.8.1
[INFO] [stderr]   Downloaded scratch v1.0.2
[INFO] [stderr]   Downloaded http-range-header v0.3.0
[INFO] [stderr]   Downloaded iana-time-zone v0.1.51
[INFO] [stderr]   Downloaded snafu-derive v0.7.3
[INFO] [stderr]   Downloaded link-cplusplus v1.0.7
[INFO] [stderr]   Downloaded console-api v0.4.0
[INFO] [stderr]   Downloaded cxxbridge-macro v1.0.80
[INFO] [stderr]   Downloaded snafu v0.7.3
[INFO] [stderr]   Downloaded tonic v0.8.2
[INFO] [stderr]   Downloaded cxx-build v1.0.80
[INFO] [stderr]   Downloaded tower-http v0.3.4
[INFO] [stderr]   Downloaded prost-types v0.11.1
[INFO] [stderr]   Downloaded prost v0.11.0
[INFO] [stderr]   Downloaded console-subscriber v0.1.8
[INFO] [stderr]   Downloaded cxx v1.0.80
[INFO] [stderr]   Downloaded async-trait v0.1.58
[INFO] [stderr]   Downloaded prost-derive v0.11.0
[INFO] [stderr]   Downloaded jobserver v0.1.25
[INFO] [stderr]   Downloaded zstd-sys v2.0.2+zstd.1.5.2
[INFO] [stderr]   Downloaded libz-sys v1.1.8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+87f2ecc56b5f6032b075c8934ebc77f28d57183c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d52787d96d0d69752629645f73ff670fdef5f3728cbff15e5a97788587ff7a2f
[INFO] running `Command { std: "docker" "start" "-a" "d52787d96d0d69752629645f73ff670fdef5f3728cbff15e5a97788587ff7a2f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d52787d96d0d69752629645f73ff670fdef5f3728cbff15e5a97788587ff7a2f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d52787d96d0d69752629645f73ff670fdef5f3728cbff15e5a97788587ff7a2f", kill_on_drop: false }`
[INFO] [stdout] d52787d96d0d69752629645f73ff670fdef5f3728cbff15e5a97788587ff7a2f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "RUSTDOCFLAGS=--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@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+87f2ecc56b5f6032b075c8934ebc77f28d57183c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1b1f9136f1103962a3df9f72abd728f85a9fbe742a05f5419a69502d0bd709fb
[INFO] running `Command { std: "docker" "start" "-a" "1b1f9136f1103962a3df9f72abd728f85a9fbe742a05f5419a69502d0bd709fb", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.137
[INFO] [stderr]    Compiling proc-macro2 v1.0.47
[INFO] [stderr]    Compiling unicode-ident v1.0.5
[INFO] [stderr]    Compiling syn v1.0.103
[INFO] [stderr]    Compiling pkg-config v0.3.26
[INFO] [stderr]    Compiling futures-core v0.3.25
[INFO] [stderr]    Compiling parking_lot_core v0.9.4
[INFO] [stderr]    Compiling serde v1.0.147
[INFO] [stderr]     Checking smallvec v1.10.0
[INFO] [stderr]    Compiling slab v0.4.7
[INFO] [stderr]    Compiling tokio v1.21.2
[INFO] [stderr]     Checking futures-sink v0.3.25
[INFO] [stderr]    Compiling thiserror v1.0.37
[INFO] [stderr]    Compiling futures-task v0.3.25
[INFO] [stderr]     Checking bytes v1.2.1
[INFO] [stderr]    Compiling futures-channel v0.3.25
[INFO] [stderr]    Compiling serde_derive v1.0.147
[INFO] [stderr]    Compiling futures-util v0.3.25
[INFO] [stderr]     Checking futures-io v0.3.25
[INFO] [stderr]    Compiling serde_json v1.0.87
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.47/src/lib.rs:92:30
[INFO] [stdout]    |
[INFO] [stdout] 92 |     feature(proc_macro_span, proc_macro_span_shrink)
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]    Compiling openssl v0.10.42
[INFO] [stderr]     Checking itoa v1.0.4
[INFO] [stderr]    Compiling heck v0.4.0
[INFO] [stderr]    Compiling async-trait v0.1.58
[INFO] [stderr]     Checking ryu v1.0.11
[INFO] [stderr]    Compiling tokio-openssl v0.6.3
[INFO] [stderr]     Checking num-integer v0.1.45
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `proc-macro2` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "1b1f9136f1103962a3df9f72abd728f85a9fbe742a05f5419a69502d0bd709fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1b1f9136f1103962a3df9f72abd728f85a9fbe742a05f5419a69502d0bd709fb", kill_on_drop: false }`
[INFO] [stdout] 1b1f9136f1103962a3df9f72abd728f85a9fbe742a05f5419a69502d0bd709fb