[INFO] cloning repository https://github.com/l4l/mcast_sniff
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/l4l/mcast_sniff" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fl4l%2Fmcast_sniff", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fl4l%2Fmcast_sniff'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ae9a592efec19d27a7d8090237712a57a33a46b6
[INFO] checking l4l/mcast_sniff against master#426a60abc213b28a7c7198e475476b6e650d871f for pr-129199
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fl4l%2Fmcast_sniff" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/l4l/mcast_sniff on toolchain 426a60abc213b28a7c7198e475476b6e650d871f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+426a60abc213b28a7c7198e475476b6e650d871f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/l4l/mcast_sniff
[INFO] finished tweaking git repo https://github.com/l4l/mcast_sniff
[INFO] tweaked toml for git repo https://github.com/l4l/mcast_sniff written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/l4l/mcast_sniff already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+426a60abc213b28a7c7198e475476b6e650d871f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking l4l/mcast_sniff against try#2c70eb47850052381670935f807d41647a7dc992 for pr-129199
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fl4l%2Fmcast_sniff" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/l4l/mcast_sniff on toolchain 2c70eb47850052381670935f807d41647a7dc992
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2c70eb47850052381670935f807d41647a7dc992" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/l4l/mcast_sniff
[INFO] finished tweaking git repo https://github.com/l4l/mcast_sniff
[INFO] tweaked toml for git repo https://github.com/l4l/mcast_sniff written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/l4l/mcast_sniff already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2c70eb47850052381670935f807d41647a7dc992" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+2c70eb47850052381670935f807d41647a7dc992" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d3266f51ba89863f192fc6a57cd3c4ff1c1415b7659f03680c7543fba88742b8
[INFO] running `Command { std: "docker" "start" "-a" "d3266f51ba89863f192fc6a57cd3c4ff1c1415b7659f03680c7543fba88742b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d3266f51ba89863f192fc6a57cd3c4ff1c1415b7659f03680c7543fba88742b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d3266f51ba89863f192fc6a57cd3c4ff1c1415b7659f03680c7543fba88742b8", kill_on_drop: false }`
[INFO] [stdout] d3266f51ba89863f192fc6a57cd3c4ff1c1415b7659f03680c7543fba88742b8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "RUSTDOCFLAGS=--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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+2c70eb47850052381670935f807d41647a7dc992" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cd6a3811e3d2e4a18fa05fb3a28e69e77628ff79d8229aef0edaae1ea8f09fa3
[INFO] running `Command { std: "docker" "start" "-a" "cd6a3811e3d2e4a18fa05fb3a28e69e77628ff79d8229aef0edaae1ea8f09fa3", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.50
[INFO] [stderr]     Checking cfg-if v0.1.7
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking mcast_sniff v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0635]: unknown feature `process_exitcode_placeholder`
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(process_exitcode_placeholder)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mcast_sniff` (bin "mcast_sniff" test) due to 2 previous errors
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0635]: unknown feature `process_exitcode_placeholder`
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(process_exitcode_placeholder)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mcast_sniff` (bin "mcast_sniff") due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "cd6a3811e3d2e4a18fa05fb3a28e69e77628ff79d8229aef0edaae1ea8f09fa3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd6a3811e3d2e4a18fa05fb3a28e69e77628ff79d8229aef0edaae1ea8f09fa3", kill_on_drop: false }`
[INFO] [stdout] cd6a3811e3d2e4a18fa05fb3a28e69e77628ff79d8229aef0edaae1ea8f09fa3