[INFO] fetching crate prost 0.8.0...
[INFO] testing prost-0.8.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate prost 0.8.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate prost 0.8.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate prost 0.8.0
[INFO] finished tweaking crates.io crate prost 0.8.0
[INFO] tweaked toml for crates.io crate prost 0.8.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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" "+1.55.0" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eb8b00136186bae35c6b47e1cf9ed379ed4cc35c5166b1002cf144a3fa6726b6
[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" "eb8b00136186bae35c6b47e1cf9ed379ed4cc35c5166b1002cf144a3fa6726b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb8b00136186bae35c6b47e1cf9ed379ed4cc35c5166b1002cf144a3fa6726b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb8b00136186bae35c6b47e1cf9ed379ed4cc35c5166b1002cf144a3fa6726b6", kill_on_drop: false }`
[INFO] [stdout] eb8b00136186bae35c6b47e1cf9ed379ed4cc35c5166b1002cf144a3fa6726b6
[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=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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7d48fa77350e92795c391309a427f70e5f58f2fc87ce1e091fee7776fdde2807
[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" "7d48fa77350e92795c391309a427f70e5f58f2fc87ce1e091fee7776fdde2807", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling bytes v1.1.0
[INFO] [stderr]    Compiling prost-derive v0.8.0
[INFO] [stderr]    Compiling prost v0.8.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.35s
[INFO] running `Command { std: "docker" "inspect" "7d48fa77350e92795c391309a427f70e5f58f2fc87ce1e091fee7776fdde2807", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d48fa77350e92795c391309a427f70e5f58f2fc87ce1e091fee7776fdde2807", kill_on_drop: false }`
[INFO] [stdout] 7d48fa77350e92795c391309a427f70e5f58f2fc87ce1e091fee7776fdde2807
[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=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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--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] 49e09e4b5c68dee3d1002be63f5ca3c6dec8059431f5347562d7696f677bf41b
[INFO] running `Command { std: "docker" "start" "-a" "49e09e4b5c68dee3d1002be63f5ca3c6dec8059431f5347562d7696f677bf41b", kill_on_drop: false }`
[INFO] [stderr]    Compiling env_logger v0.8.4
[INFO] [stderr]    Compiling criterion v0.3.5
[INFO] [stderr]    Compiling proptest v1.0.0
[INFO] [stderr]    Compiling prost v0.8.0 (/opt/rustwide/workdir)
[INFO] [stderr] error: could not compile `prost`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name prost --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --test --cfg 'feature="default"' --cfg 'feature="prost-derive"' --cfg 'feature="std"' -C metadata=4a3bf52a2c2f7d87 -C extra-filename=-4a3bf52a2c2f7d87 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern bytes=/opt/rustwide/target/debug/deps/libbytes-212c59d3271e53b3.rlib --extern criterion=/opt/rustwide/target/debug/deps/libcriterion-e82ae3f1784b3cad.rlib --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-f540b998006d2068.rlib --extern log=/opt/rustwide/target/debug/deps/liblog-7914ddd45155fdc8.rlib --extern proptest=/opt/rustwide/target/debug/deps/libproptest-073e0ad7cfdf859f.rlib --extern prost_derive=/opt/rustwide/target/debug/deps/libprost_derive-75883db9bd35251b.so --extern rand=/opt/rustwide/target/debug/deps/librand-5ab5f6411868649c.rlib --cap-lints=warn` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "49e09e4b5c68dee3d1002be63f5ca3c6dec8059431f5347562d7696f677bf41b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "49e09e4b5c68dee3d1002be63f5ca3c6dec8059431f5347562d7696f677bf41b", kill_on_drop: false }`
[INFO] [stdout] 49e09e4b5c68dee3d1002be63f5ca3c6dec8059431f5347562d7696f677bf41b