[INFO] fetching crate ferrite-session 0.1.0...
[INFO] testing ferrite-session-0.1.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate ferrite-session 0.1.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate ferrite-session 0.1.0 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ferrite-session 0.1.0
[INFO] finished tweaking crates.io crate ferrite-session 0.1.0
[INFO] tweaked toml for crates.io crate ferrite-session 0.1.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate ferrite-session 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8f74ddcb9870760f44fa6a4f4ec657e3f68625354dea67a7c60fe41abce2f4be
[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" "8f74ddcb9870760f44fa6a4f4ec657e3f68625354dea67a7c60fe41abce2f4be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8f74ddcb9870760f44fa6a4f4ec657e3f68625354dea67a7c60fe41abce2f4be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f74ddcb9870760f44fa6a4f4ec657e3f68625354dea67a7c60fe41abce2f4be", kill_on_drop: false }`
[INFO] [stdout] 8f74ddcb9870760f44fa6a4f4ec657e3f68625354dea67a7c60fe41abce2f4be
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5f261d11cbbc11c01b16096b7f30953051941b1b0040efc43f747206dd2fd684
[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" "5f261d11cbbc11c01b16096b7f30953051941b1b0040efc43f747206dd2fd684", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling paste v1.0.3
[INFO] [stderr]    Compiling futures-channel v0.3.8
[INFO] [stderr]    Compiling async-macros v2.0.0
[INFO] [stderr]    Compiling futures-lite v1.11.2
[INFO] [stderr]    Compiling nb-connect v1.0.2
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling polling v2.0.2
[INFO] [stderr]    Compiling kv-log-macro v1.0.7
[INFO] [stderr]    Compiling env_logger v0.7.1
[INFO] [stderr]    Compiling async-executor v1.4.0
[INFO] [stderr]    Compiling blocking v1.0.2
[INFO] [stderr]    Compiling async-io v1.2.0
[INFO] [stderr]    Compiling async-global-executor v1.4.3
[INFO] [stderr]    Compiling pin-project-internal v1.0.1
[INFO] [stderr]    Compiling futures-macro v0.3.8
[INFO] [stderr]    Compiling async-attributes v1.1.1
[INFO] [stderr]    Compiling async-std v1.7.0
[INFO] [stderr]    Compiling pin-project v1.0.1
[INFO] [stderr]    Compiling futures-util v0.3.8
[INFO] [stderr]    Compiling futures-executor v0.3.8
[INFO] [stderr]    Compiling futures v0.3.8
[INFO] [stderr]    Compiling ferrite-session v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error: could not compile `ferrite-session`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name internal_choice --edition=2018 src/bin/internal_choice.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=5eba23b0fc9aed77 -C extra-filename=-5eba23b0fc9aed77 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern async_macros=/opt/rustwide/target/debug/deps/libasync_macros-d30dd64eeabcd2c6.rlib --extern async_std=/opt/rustwide/target/debug/deps/libasync_std-bb2bed43b47c363d.rlib --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-7e0a89b9e4725009.rlib --extern ferrite_session=/opt/rustwide/target/debug/deps/libferrite_session-cc84710cce21fb70.rlib --extern futures=/opt/rustwide/target/debug/deps/libfutures-80c673cf0044114d.rlib --extern log=/opt/rustwide/target/debug/deps/liblog-574ec1b45a6b839c.rlib --extern paste=/opt/rustwide/target/debug/deps/libpaste-9a4c86e2320774c0.so --extern rand=/opt/rustwide/target/debug/deps/librand-f3ce72d935c66aa4.rlib --cap-lints=warn` (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" "5f261d11cbbc11c01b16096b7f30953051941b1b0040efc43f747206dd2fd684", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5f261d11cbbc11c01b16096b7f30953051941b1b0040efc43f747206dd2fd684", kill_on_drop: false }`
[INFO] [stdout] 5f261d11cbbc11c01b16096b7f30953051941b1b0040efc43f747206dd2fd684