[INFO] cloning repository https://github.com/cobalt-org/cobalt.rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cobalt-org/cobalt.rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcobalt-org%2Fcobalt.rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcobalt-org%2Fcobalt.rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 79a31defc67896ba2e23fb3772d54a175f5fc232
[INFO] testing cobalt-org/cobalt.rs against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcobalt-org%2Fcobalt.rs" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cobalt-org/cobalt.rs on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/cobalt-org/cobalt.rs
[INFO] finished tweaking git repo https://github.com/cobalt-org/cobalt.rs
[INFO] tweaked toml for git repo https://github.com/cobalt-org/cobalt.rs written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/cobalt-org/cobalt.rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "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] 256ba3a494ed4bc0d0dd3f0e10ef436b69ffd14bb7e25f72ed67ed48205dafdf
[INFO] running `Command { std: "docker" "start" "-a" "256ba3a494ed4bc0d0dd3f0e10ef436b69ffd14bb7e25f72ed67ed48205dafdf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "256ba3a494ed4bc0d0dd3f0e10ef436b69ffd14bb7e25f72ed67ed48205dafdf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "256ba3a494ed4bc0d0dd3f0e10ef436b69ffd14bb7e25f72ed67ed48205dafdf", kill_on_drop: false }`
[INFO] [stdout] 256ba3a494ed4bc0d0dd3f0e10ef436b69ffd14bb7e25f72ed67ed48205dafdf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "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] d68e140f8c7a3ddf1210ef9a256589b620e402e541405f25bb2ae8873b7bacf9
[INFO] running `Command { std: "docker" "start" "-a" "d68e140f8c7a3ddf1210ef9a256589b620e402e541405f25bb2ae8873b7bacf9", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.36
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling proc-macro-hack v0.5.18
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling derive_builder v0.9.0
[INFO] [stderr]    Compiling itoa v0.4.6
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]    Compiling deunicode v1.1.1
[INFO] [stderr]    Compiling pulldown-cmark v0.8.0
[INFO] [stderr]    Compiling once_cell v1.4.0
[INFO] [stderr]    Compiling ascii v1.0.0
[INFO] [stderr]    Compiling chunked_transfer v1.2.0
[INFO] [stderr]    Compiling humantime v2.0.1
[INFO] [stderr]    Compiling open v1.4.0
[INFO] [stderr]    Compiling hashbrown v0.8.1
[INFO] [stderr]    Compiling indexmap v1.5.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.1
[INFO] [stderr]    Compiling addr2line v0.13.0
[INFO] [stderr]    Compiling itertools v0.10.0
[INFO] [stderr]    Compiling line-wrap v0.1.1
[INFO] [stderr]    Compiling yaml-rust v0.4.4
[INFO] [stderr]    Compiling pest v2.1.3
[INFO] [stderr]    Compiling inotify-sys v0.1.3
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling filetime v0.2.12
[INFO] [stderr]    Compiling bstr v0.2.13
[INFO] [stderr]    Compiling flate2 v1.0.16
[INFO] [stderr]    Compiling quick-xml v0.17.2
[INFO] [stderr]    Compiling sass-sys v0.4.21
[INFO] [stderr]    Compiling mio v0.6.22
[INFO] [stderr]    Compiling regex v1.4.2
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling inotify v0.7.1
[INFO] [stderr]    Compiling backtrace v0.3.50
[INFO] [stderr]    Compiling ghp v0.1.2
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling error-chain v0.10.0
[INFO] [stderr]    Compiling mio-extras v2.0.6
[INFO] [stderr]    Compiling proc-quote-impl v0.3.2
[INFO] [stderr] error: could not compile `backtrace`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name backtrace --edition=2018 /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.50/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="addr2line"' --cfg 'feature="default"' --cfg 'feature="gimli-symbolize"' --cfg 'feature="miniz_oxide"' --cfg 'feature="object"' --cfg 'feature="std"' -C metadata=fc9ea39f04898de8 -C extra-filename=-fc9ea39f04898de8 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern addr2line=/opt/rustwide/target/debug/deps/libaddr2line-e1a45fca33362bb8.rmeta --extern cfg_if=/opt/rustwide/target/debug/deps/libcfg_if-b10e0993eefc366b.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-655f967ebfad5af1.rmeta --extern miniz_oxide=/opt/rustwide/target/debug/deps/libminiz_oxide-4102ec84d4433842.rmeta --extern object=/opt/rustwide/target/debug/deps/libobject-1b3f948739d3c9d4.rmeta --extern rustc_demangle=/opt/rustwide/target/debug/deps/librustc_demangle-cd0ead7d00ad78db.rmeta --cap-lints allow --cap-lints=warn` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "d68e140f8c7a3ddf1210ef9a256589b620e402e541405f25bb2ae8873b7bacf9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d68e140f8c7a3ddf1210ef9a256589b620e402e541405f25bb2ae8873b7bacf9", kill_on_drop: false }`
[INFO] [stdout] d68e140f8c7a3ddf1210ef9a256589b620e402e541405f25bb2ae8873b7bacf9