[INFO] fetching crate fuzzcheck 0.4.0...
[INFO] checking fuzzcheck-0.4.0 against master#d62d3f7fa9a91d933213cc10e20e740608983f64 for pr-77015
[INFO] extracting crate fuzzcheck 0.4.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate fuzzcheck 0.4.0 on toolchain d62d3f7fa9a91d933213cc10e20e740608983f64
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fuzzcheck 0.4.0
[INFO] finished tweaking crates.io crate fuzzcheck 0.4.0
[INFO] tweaked toml for crates.io crate fuzzcheck 0.4.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "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" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "fetch" "--locked" "--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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b9578a51a668257634c7d456f8b598b11e4271dfda12c8a8e8fea1ea96c86e61
[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" "b9578a51a668257634c7d456f8b598b11e4271dfda12c8a8e8fea1ea96c86e61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b9578a51a668257634c7d456f8b598b11e4271dfda12c8a8e8fea1ea96c86e61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b9578a51a668257634c7d456f8b598b11e4271dfda12c8a8e8fea1ea96c86e61", kill_on_drop: false }`
[INFO] [stdout] b9578a51a668257634c7d456f8b598b11e4271dfda12c8a8e8fea1ea96c86e61
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8d1219162493afb33468960ecb6bd3685d38db77af270715494a88eca0470d56
[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" "8d1219162493afb33468960ecb6bd3685d38db77af270715494a88eca0470d56", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.78
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking fuzzcheck_traits v0.4.0
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]     Checking fuzzcheck_arg_parser v0.4.0
[INFO] [stderr]     Checking fuzzcheck v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: constant is never used: `EWOULDBLOCK`
[INFO] [stdout]    --> src/nix_subset/errno.rs:816:5
[INFO] [stdout]     |
[INFO] [stdout] 816 |     pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `EDEADLOCK`
[INFO] [stdout]    --> src/nix_subset/errno.rs:817:5
[INFO] [stdout]     |
[INFO] [stdout] 817 |     pub const EDEADLOCK: Errno = Errno::EDEADLK;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ENOTSUP`
[INFO] [stdout]    --> src/nix_subset/errno.rs:818:5
[INFO] [stdout]     |
[INFO] [stdout] 818 |     pub const ENOTSUP: Errno = Errno::EOPNOTSUPP;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `type_of_thread_id`
[INFO] [stdout]    --> src/nix_subset/signal.rs:423:1
[INFO] [stdout]     |
[INFO] [stdout] 423 | pub type type_of_thread_id = libc::pid_t;
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `ptr_offset_from` has been stable since 1.47.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(ptr_offset_from)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `EWOULDBLOCK`
[INFO] [stdout]    --> src/nix_subset/errno.rs:816:5
[INFO] [stdout]     |
[INFO] [stdout] 816 |     pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `EDEADLOCK`
[INFO] [stdout]    --> src/nix_subset/errno.rs:817:5
[INFO] [stdout]     |
[INFO] [stdout] 817 |     pub const EDEADLOCK: Errno = Errno::EDEADLK;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ENOTSUP`
[INFO] [stdout]    --> src/nix_subset/errno.rs:818:5
[INFO] [stdout]     |
[INFO] [stdout] 818 |     pub const ENOTSUP: Errno = Errno::EOPNOTSUPP;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `type_of_thread_id`
[INFO] [stdout]    --> src/nix_subset/signal.rs:423:1
[INFO] [stdout]     |
[INFO] [stdout] 423 | pub type type_of_thread_id = libc::pid_t;
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `ptr_offset_from` has been stable since 1.47.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(ptr_offset_from)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.23s
[INFO] running `Command { std: "docker" "inspect" "8d1219162493afb33468960ecb6bd3685d38db77af270715494a88eca0470d56", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d1219162493afb33468960ecb6bd3685d38db77af270715494a88eca0470d56", kill_on_drop: false }`
[INFO] [stdout] 8d1219162493afb33468960ecb6bd3685d38db77af270715494a88eca0470d56