[INFO] fetching crate async-task 4.0.3...
[INFO] checking async-task-4.0.3 against try#7b3565da729099dbe807466fcd118fb2815986e0 for pr-81789
[INFO] extracting crate async-task 4.0.3 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate async-task 4.0.3 on toolchain 7b3565da729099dbe807466fcd118fb2815986e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7b3565da729099dbe807466fcd118fb2815986e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate async-task 4.0.3
[INFO] finished tweaking crates.io crate async-task 4.0.3
[INFO] tweaked toml for crates.io crate async-task 4.0.3 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate async-task 4.0.3 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7b3565da729099dbe807466fcd118fb2815986e0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded async-executor v1.1.1
[INFO] [stderr]   Downloaded nb-connect v1.0.0
[INFO] [stderr]   Downloaded futures-lite v1.7.0
[INFO] [stderr]   Downloaded async-rwlock v1.1.0
[INFO] [stderr]   Downloaded smol v1.0.1
[INFO] [stderr]   Downloaded async-net v1.3.0
[INFO] [stderr]   Downloaded async-fs v1.3.0
[INFO] [stderr]   Downloaded blocking v1.0.0
[INFO] [stderr]   Downloaded async-process v1.0.0
[INFO] [stderr]   Downloaded async-io v1.1.2
[INFO] [stderr]   Downloaded async-mutex v1.3.0
[INFO] [stderr]   Downloaded async-semaphore v1.1.0
[INFO] [stderr]   Downloaded async-barrier v1.0.1
[INFO] [stderr]   Downloaded polling v1.0.3
[INFO] [stderr]   Downloaded flume v0.9.0
[INFO] [stderr]   Downloaded async-lock v2.1.3
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+7b3565da729099dbe807466fcd118fb2815986e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 14086b4f759d898af615e3ebfbfcc94387fbebe979671d3e213beca665d01d9e
[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" "14086b4f759d898af615e3ebfbfcc94387fbebe979671d3e213beca665d01d9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "14086b4f759d898af615e3ebfbfcc94387fbebe979671d3e213beca665d01d9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14086b4f759d898af615e3ebfbfcc94387fbebe979671d3e213beca665d01d9e", kill_on_drop: false }`
[INFO] [stdout] 14086b4f759d898af615e3ebfbfcc94387fbebe979671d3e213beca665d01d9e
[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=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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+7b3565da729099dbe807466fcd118fb2815986e0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f703236124f51cee39b851dd83791871e5215ed3e1090ef336cdc1780f94fd12
[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" "f703236124f51cee39b851dd83791871e5215ed3e1090ef336cdc1780f94fd12", kill_on_drop: false }`
[INFO] [stderr]     Checking event-listener v2.4.0
[INFO] [stderr]    Compiling libc v0.2.77
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking fastrand v1.3.5
[INFO] [stderr]     Checking futures-io v0.3.5
[INFO] [stderr]     Checking once_cell v1.4.1
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking vec-arena v1.0.0
[INFO] [stderr]     Checking async-task v3.0.0
[INFO] [stderr]     Checking easy-parallel v3.1.0
[INFO] [stderr]     Checking async-task v4.0.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking lock_api v0.4.1
[INFO] [stderr]     Checking async-mutex v1.3.0
[INFO] [stderr]     Checking async-channel v1.4.2
[INFO] [stderr]     Checking async-semaphore v1.1.0
[INFO] [stderr]     Checking async-barrier v1.0.1
[INFO] [stderr]     Checking async-rwlock v1.1.0
[INFO] [stderr]     Checking spinning_top v0.2.2
[INFO] [stderr]     Checking flume v0.9.0
[INFO] [stderr]     Checking async-lock v2.1.3
[INFO] [stderr]     Checking futures-lite v1.7.0
[INFO] [stderr]     Checking nb-connect v1.0.0
[INFO] [stderr]     Checking polling v1.0.3
[INFO] [stderr]     Checking signal-hook-registry v1.2.1
[INFO] [stderr]     Checking signal-hook v0.1.16
[INFO] [stderr]     Checking async-io v1.1.2
[INFO] [stderr]     Checking blocking v1.0.0
[INFO] [stderr]     Checking async-executor v1.1.1
[INFO] [stderr]     Checking async-fs v1.3.0
[INFO] [stderr]     Checking async-net v1.3.0
[INFO] [stderr]     Checking async-process v1.0.0
[INFO] [stderr]     Checking smol v1.0.1
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.56s
[INFO] running `Command { std: "docker" "inspect" "f703236124f51cee39b851dd83791871e5215ed3e1090ef336cdc1780f94fd12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f703236124f51cee39b851dd83791871e5215ed3e1090ef336cdc1780f94fd12", kill_on_drop: false }`
[INFO] [stdout] f703236124f51cee39b851dd83791871e5215ed3e1090ef336cdc1780f94fd12