[INFO] crate tari_comms_middleware 0.0.7 is already in cache
[INFO] testing tari_comms_middleware-0.0.7 against 1.44.0 for beta-1.45-1
[INFO] extracting crate tari_comms_middleware 0.0.7 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate tari_comms_middleware 0.0.7 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate tari_comms_middleware 0.0.7
[INFO] finished tweaking crates.io crate tari_comms_middleware 0.0.7
[INFO] tweaked toml for crates.io crate tari_comms_middleware 0.0.7 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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=warn" "-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" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2fc96902f7b491f1fb10c46a61e759ee73457386b7ec316235990d24e710fcb1
[INFO] running `"docker" "start" "-a" "2fc96902f7b491f1fb10c46a61e759ee73457386b7ec316235990d24e710fcb1"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling tower-layer v0.3.0
[INFO] [stderr]    Compiling subtle v2.2.3
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling unsigned-varint v0.3.3
[INFO] [stderr]    Compiling fixedbitset v0.2.0
[INFO] [stderr]    Compiling rust-ini v0.13.0
[INFO] [stderr]    Compiling bs58 v0.3.1
[INFO] [stderr]    Compiling multimap v0.8.1
[INFO] [stderr]    Compiling antidote v1.0.0
[INFO] [stderr]    Compiling c_linked_list v1.1.1
[INFO] [stderr]    Compiling arc-swap v0.3.11
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]    Compiling log-mdc v0.1.0
[INFO] [stderr]    Compiling constant_time_eq v0.1.5
[INFO] [stderr]    Compiling nodrop v0.1.14
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/subtle-2.2.3/src/lib.rs:12:34
[INFO] [stderr]    |
[INFO] [stderr] 12 | #![cfg_attr(feature = "nightly", feature(external_doc))]
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling supercow v0.1.0
[INFO] [stderr]    Compiling bitstring v0.1.1
[INFO] [stderr]    Compiling nohash-hasher v0.2.0
[INFO] [stderr]    Compiling tracing-core v0.1.10
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `subtle`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "2fc96902f7b491f1fb10c46a61e759ee73457386b7ec316235990d24e710fcb1"`
[INFO] running `"docker" "rm" "-f" "2fc96902f7b491f1fb10c46a61e759ee73457386b7ec316235990d24e710fcb1"`
[INFO] [stdout] 2fc96902f7b491f1fb10c46a61e759ee73457386b7ec316235990d24e710fcb1