[INFO] fetching crate cargo 0.50.0...
[INFO] testing cargo-0.50.0 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate cargo 0.50.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate cargo 0.50.0 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cargo 0.50.0
[INFO] finished tweaking crates.io crate cargo 0.50.0
[INFO] tweaked toml for crates.io crate cargo 0.50.0 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate crates.io crate cargo 0.50.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded syn v1.0.37
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c0807fe4026511305df776402725f30aa0464a0fb568630d1ef667010445088a
[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" "c0807fe4026511305df776402725f30aa0464a0fb568630d1ef667010445088a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c0807fe4026511305df776402725f30aa0464a0fb568630d1ef667010445088a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0807fe4026511305df776402725f30aa0464a0fb568630d1ef667010445088a", kill_on_drop: false }`
[INFO] [stdout] c0807fe4026511305df776402725f30aa0464a0fb568630d1ef667010445088a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1b1fa424dc7245164621429bda65c4b355bcbf900eb7f89d7d456e57c2b611a9
[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" "1b1fa424dc7245164621429bda65c4b355bcbf900eb7f89d7d456e57c2b611a9", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.37
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]    Compiling serde_json v1.0.57
[INFO] [stderr]    Compiling curl v0.4.31
[INFO] [stderr]    Compiling openssl v0.10.30
[INFO] [stderr]    Compiling shell-escape v0.1.5
[INFO] [stderr]    Compiling crossbeam-utils v0.8.1
[INFO] [stderr]    Compiling im-rc v15.0.0
[INFO] [stderr]    Compiling jobserver v0.1.21
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling socket2 v0.3.12
[INFO] [stderr]    Compiling filetime v0.2.12
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling sized-chunks v0.6.2
[INFO] [stderr]    Compiling globset v0.4.5
[INFO] [stderr]    Compiling clap v2.33.1
[INFO] [stderr]    Compiling env_logger v0.8.2
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling cc v1.0.58
[INFO] [stderr]    Compiling tar v0.4.29
[INFO] [stderr]    Compiling ignore v0.4.16
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand_xoshiro v0.4.0
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling openssl-sys v0.9.58
[INFO] [stderr]    Compiling libz-sys v1.1.2
[INFO] [stderr]    Compiling libnghttp2-sys v0.1.4+1.41.0
[INFO] [stderr]    Compiling curl-sys v0.4.33+curl-7.71.1
[INFO] [stderr]    Compiling libssh2-sys v0.2.20
[INFO] [stderr]    Compiling libgit2-sys v0.12.17+1.1.0
[INFO] [stderr]    Compiling tempfile v3.1.0
[INFO] [stderr]    Compiling flate2 v1.0.16
[INFO] [stderr]    Compiling cargo v0.50.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]    Compiling crypto-hash v0.3.4
[INFO] [stderr]    Compiling git2 v0.13.15
[INFO] [stderr]    Compiling git2-curl v0.14.0
[INFO] [stderr]    Compiling serde_ignored v0.1.2
[INFO] [stderr]    Compiling toml v0.5.8
[INFO] [stderr]    Compiling cargo-platform v0.1.1
[INFO] [stderr]    Compiling semver v0.10.0
[INFO] [stderr]    Compiling rustfix v0.5.1
[INFO] [stderr]    Compiling crates-io v0.31.1
[INFO] [stderr] error: could not compile `cargo`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name cargo --edition=2018 src/cargo/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 -C metadata=2ed0ca8c243b637e -C extra-filename=-2ed0ca8c243b637e --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-35265deee4aeadc6.rmeta --extern atty=/opt/rustwide/target/debug/deps/libatty-30216741e5794c7d.rmeta --extern bytesize=/opt/rustwide/target/debug/deps/libbytesize-8c617c8e64e3d303.rmeta --extern cargo_platform=/opt/rustwide/target/debug/deps/libcargo_platform-e336663e1df45808.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-284750c6b5b3f7e6.rmeta --extern crates_io=/opt/rustwide/target/debug/deps/libcrates_io-65eea249f37d1ef7.rmeta --extern crossbeam_utils=/opt/rustwide/target/debug/deps/libcrossbeam_utils-6e87664030724e2f.rmeta --extern crypto_hash=/opt/rustwide/target/debug/deps/libcrypto_hash-3ffeb17f3fa5203e.rmeta --extern curl=/opt/rustwide/target/debug/deps/libcurl-0aed506b70f7189f.rmeta --extern curl_sys=/opt/rustwide/target/debug/deps/libcurl_sys-2fa66f3ef3666221.rmeta --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-cd0e6e1ec39f94ce.rmeta --extern filetime=/opt/rustwide/target/debug/deps/libfiletime-942954bfe830f61c.rmeta --extern flate2=/opt/rustwide/target/debug/deps/libflate2-7ca6e65a323ae88a.rmeta --extern git2=/opt/rustwide/target/debug/deps/libgit2-ce2a46da3028f32e.rmeta --extern git2_curl=/opt/rustwide/target/debug/deps/libgit2_curl-991f33f5059f2b2b.rmeta --extern glob=/opt/rustwide/target/debug/deps/libglob-25d3e3c81b4cce0b.rmeta --extern hex=/opt/rustwide/target/debug/deps/libhex-14911843fdb620d9.rmeta --extern home=/opt/rustwide/target/debug/deps/libhome-dfb8355f685d1e17.rmeta --extern humantime=/opt/rustwide/target/debug/deps/libhumantime-adb1c3dfaf792f89.rmeta --extern ignore=/opt/rustwide/target/debug/deps/libignore-eca2b3b506429b02.rmeta --extern im_rc=/opt/rustwide/target/debug/deps/libim_rc-a293610cb61ed463.rmeta --extern jobserver=/opt/rustwide/target/debug/deps/libjobserver-94d054dd3f8d65ac.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-b2d06f7d60fcbb27.rmeta --extern lazycell=/opt/rustwide/target/debug/deps/liblazycell-4c1c761561765642.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-8ad0edd0dffec967.rmeta --extern libgit2_sys=/opt/rustwide/target/debug/deps/liblibgit2_sys-539c48b50d5d0cbd.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-93afe3d9087c158b.rmeta --extern memchr=/opt/rustwide/target/debug/deps/libmemchr-90bac19b7815f3a4.rmeta --extern num_cpus=/opt/rustwide/target/debug/deps/libnum_cpus-1630f5d1ed56db99.rmeta --extern opener=/opt/rustwide/target/debug/deps/libopener-2c8376723d2a8c9d.rmeta --extern percent_encoding=/opt/rustwide/target/debug/deps/libpercent_encoding-6ae592ab414920f8.rmeta --extern rustc_workspace_hack=/opt/rustwide/target/debug/deps/librustc_workspace_hack-919478551723e1cd.rmeta --extern rustfix=/opt/rustwide/target/debug/deps/librustfix-67cd8da814262124.rmeta --extern same_file=/opt/rustwide/target/debug/deps/libsame_file-5b9a65c02ab19218.rmeta --extern semver=/opt/rustwide/target/debug/deps/libsemver-5f9940d6ff7211c7.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-3ab5a091ebae21d5.rmeta --extern serde_ignored=/opt/rustwide/target/debug/deps/libserde_ignored-09155244d20e3e49.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-aa9f3f3c64229b21.rmeta --extern shell_escape=/opt/rustwide/target/debug/deps/libshell_escape-f7af420078e13fe3.rmeta --extern strip_ansi_escapes=/opt/rustwide/target/debug/deps/libstrip_ansi_escapes-9988c264e5d8275b.rmeta --extern tar=/opt/rustwide/target/debug/deps/libtar-5d76baeb2a238f3f.rmeta --extern tempfile=/opt/rustwide/target/debug/deps/libtempfile-6f2f1da8c07fbbc7.rmeta --extern termcolor=/opt/rustwide/target/debug/deps/libtermcolor-e4b34bdcfdb5f1c4.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-3cab698b5469237f.rmeta --extern unicode_width=/opt/rustwide/target/debug/deps/libunicode_width-906fa989c4fba052.rmeta --extern unicode_xid=/opt/rustwide/target/debug/deps/libunicode_xid-5ee0227a60781e0f.rmeta --extern url=/opt/rustwide/target/debug/deps/liburl-7a1f69ccf77512fa.rmeta --extern walkdir=/opt/rustwide/target/debug/deps/libwalkdir-61d7662228196c72.rmeta --cap-lints=warn -L native=/opt/rustwide/target/debug/build/curl-sys-41587d9713528631/out/build -L native=/opt/rustwide/target/debug/build/libnghttp2-sys-b20d0c5134ee18a0/out/i/lib -L native=/opt/rustwide/target/debug/build/libgit2-sys-5b07d88fafa8e2fe/out/build -L native=/opt/rustwide/target/debug/build/libssh2-sys-87a1d57a1d5110ab/out/build` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "1b1fa424dc7245164621429bda65c4b355bcbf900eb7f89d7d456e57c2b611a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1b1fa424dc7245164621429bda65c4b355bcbf900eb7f89d7d456e57c2b611a9", kill_on_drop: false }`
[INFO] [stdout] 1b1fa424dc7245164621429bda65c4b355bcbf900eb7f89d7d456e57c2b611a9