[INFO] fetching crate mtpng 0.3.3...
[INFO] checking mtpng-0.3.3 against master#6250d56355d72264ece721e8d0dc95b16a6824b1 for pr-68350
[INFO] extracting crate mtpng 0.3.3 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate mtpng 0.3.3 on toolchain 6250d56355d72264ece721e8d0dc95b16a6824b1
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6250d56355d72264ece721e8d0dc95b16a6824b1" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate mtpng 0.3.3
[INFO] finished tweaking crates.io crate mtpng 0.3.3
[INFO] tweaked toml for crates.io crate mtpng 0.3.3 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate mtpng 0.3.3 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6250d56355d72264ece721e8d0dc95b16a6824b1" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+6250d56355d72264ece721e8d0dc95b16a6824b1" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] df3a13d4337211fe62a9fd57dba7ad2a017a5708899b612d66ca15af1b986cd0
[INFO] running `"docker" "start" "-a" "df3a13d4337211fe62a9fd57dba7ad2a017a5708899b612d66ca15af1b986cd0"`
[INFO] [stderr]    Compiling memoffset v0.5.2
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]     Checking crossbeam-deque v0.7.1
[INFO] [stderr]     Checking rayon-core v1.6.0
[INFO] [stderr]     Checking rayon v1.2.0
[INFO] [stderr]     Checking mtpng v0.3.3 (/opt/rustwide/workdir)
[INFO] [stderr] warning: the type `libz_sys::z_stream` does not permit zero-initialization
[INFO] [stderr]    --> src/deflate.rs:150:17
[INFO] [stderr]     |
[INFO] [stderr] 150 |                 mem::MaybeUninit::zeroed().assume_init()
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 this code causes undefined behavior when executed
[INFO] [stderr]     |                 help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(invalid_value)]` on by default
[INFO] [stderr] note: function pointers must be non-null (in this struct field)
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/libz-sys-1.0.25/src/lib.rs:57:5
[INFO] [stderr]     |
[INFO] [stderr] 57  |     pub zalloc: alloc_func,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the type `libz_sys::z_stream` does not permit zero-initialization
[INFO] [stderr]    --> src/deflate.rs:150:17
[INFO] [stderr]     |
[INFO] [stderr] 150 |                 mem::MaybeUninit::zeroed().assume_init()
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 this code causes undefined behavior when executed
[INFO] [stderr]     |                 help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(invalid_value)]` on by default
[INFO] [stderr] note: function pointers must be non-null (in this struct field)
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/libz-sys-1.0.25/src/lib.rs:57:5
[INFO] [stderr]     |
[INFO] [stderr] 57  |     pub zalloc: alloc_func,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.75s
[INFO] running `"docker" "inspect" "df3a13d4337211fe62a9fd57dba7ad2a017a5708899b612d66ca15af1b986cd0"`
[INFO] running `"docker" "rm" "-f" "df3a13d4337211fe62a9fd57dba7ad2a017a5708899b612d66ca15af1b986cd0"`
[INFO] [stdout] df3a13d4337211fe62a9fd57dba7ad2a017a5708899b612d66ca15af1b986cd0