[INFO] fetching crate mcs 0.1.1...
[INFO] testing mcs-0.1.1 against 1.60.0 for beta-1.61-1
[INFO] extracting crate mcs 0.1.1 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate mcs 0.1.1 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mcs 0.1.1
[INFO] finished tweaking crates.io crate mcs 0.1.1
[INFO] tweaked toml for crates.io crate mcs 0.1.1 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "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" "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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", 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] ec665c03965890cb42ceb0fe4ac89ddd4293439f4d2328cfe40d8cdb25b28792
[INFO] running `Command { std: "docker" "start" "-a" "ec665c03965890cb42ceb0fe4ac89ddd4293439f4d2328cfe40d8cdb25b28792", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ec665c03965890cb42ceb0fe4ac89ddd4293439f4d2328cfe40d8cdb25b28792", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec665c03965890cb42ceb0fe4ac89ddd4293439f4d2328cfe40d8cdb25b28792", kill_on_drop: false }`
[INFO] [stdout] ec665c03965890cb42ceb0fe4ac89ddd4293439f4d2328cfe40d8cdb25b28792
[INFO] running `Command { std: "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" "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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--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] beb7ada48b9b554a05abbd61f5240d159cad6d763b90913edc844d67234c79fd
[INFO] running `Command { std: "docker" "start" "-a" "beb7ada48b9b554a05abbd61f5240d159cad6d763b90913edc844d67234c79fd", kill_on_drop: false }`
[INFO] [stderr]    Compiling mcs v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:1:48
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature = "unstable", feature(asm, const_fn, generic_param_attrs, dropck_eyepatch))]
[INFO] [stdout]   |                                                ^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: split into finer-grained feature gates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find macro `asm` in this scope
[INFO] [stdout]  --> src/pause.rs:6:14
[INFO] [stdout]   |
[INFO] [stdout] 6 |     unsafe { asm!("pause" :::: "volatile"); }
[INFO] [stdout]   |              ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider importing this macro:
[INFO] [stdout]           core::arch::asm
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:35
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature = "unstable", feature(asm, const_fn, generic_param_attrs, dropck_eyepatch))]
[INFO] [stdout]   |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `generic_param_attrs` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `core::sync::atomic::AtomicPtr::<T>::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
[INFO] [stdout]    --> src/mutex.rs:134:23
[INFO] [stdout]     |
[INFO] [stdout] 134 |         if self.queue.compare_and_swap(ptr::null_mut(), slot, Ordering::AcqRel).is_null() {
[INFO] [stdout]     |                       ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mcs` due to 4 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "beb7ada48b9b554a05abbd61f5240d159cad6d763b90913edc844d67234c79fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "beb7ada48b9b554a05abbd61f5240d159cad6d763b90913edc844d67234c79fd", kill_on_drop: false }`
[INFO] [stdout] beb7ada48b9b554a05abbd61f5240d159cad6d763b90913edc844d67234c79fd