[INFO] cloning repository https://github.com/alx365/RickRollOS
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/alx365/RickRollOS" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falx365%2FRickRollOS", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falx365%2FRickRollOS'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2178a453fce1c4859209ae140598c23e00f370b0
[INFO] testing alx365/RickRollOS against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falx365%2FRickRollOS" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alx365/RickRollOS 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] removed /workspace/builds/worker-7/source/.cargo/config
[INFO] started tweaking git repo https://github.com/alx365/RickRollOS
[INFO] finished tweaking git repo https://github.com/alx365/RickRollOS
[INFO] tweaked toml for git repo https://github.com/alx365/RickRollOS written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/alx365/RickRollOS 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b3aaeeb3e8b859d5dc55a6313e1f71b386da5e62530285f54c24d0ed512f59e9
[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" "b3aaeeb3e8b859d5dc55a6313e1f71b386da5e62530285f54c24d0ed512f59e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b3aaeeb3e8b859d5dc55a6313e1f71b386da5e62530285f54c24d0ed512f59e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b3aaeeb3e8b859d5dc55a6313e1f71b386da5e62530285f54c24d0ed512f59e9", kill_on_drop: false }`
[INFO] [stdout] b3aaeeb3e8b859d5dc55a6313e1f71b386da5e62530285f54c24d0ed512f59e9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/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] 9543cccfb4fdad99e82feecdfb2b13ebdcda58e76d523064555ff309acb5633a
[INFO] running `Command { std: "docker" "start" "-a" "9543cccfb4fdad99e82feecdfb2b13ebdcda58e76d523064555ff309acb5633a", kill_on_drop: false }`
[INFO] [stderr]    Compiling bootloader v0.9.4
[INFO] [stderr]    Compiling spin v0.5.2
[INFO] [stderr]    Compiling volatile v0.2.6
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling os v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: linking with `cc` failed: exit code: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-Wl,--eh-frame-hdr" "-L" "/opt/rustwide/rustup-home/toolchains/1.49.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.10.rcgu.o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.11.rcgu.o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.12.rcgu.o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.13.rcgu.o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.14.rcgu.o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.15.rcgu.o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.9.rcgu.o" "-o" "/opt/rustwide/target/debug/deps/os-0e5417959ff13912" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/rustup-home/toolchains/1.49.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/libvolatile-7a5d65d8b1d8c3c1.rlib" "/opt/rustwide/target/debug/deps/liblazy_static-cadb32f42b3cc57f.rlib" "/opt/rustwide/target/debug/deps/libspin-618b61886456e985.rlib" "/opt/rustwide/rustup-home/toolchains/1.49.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-25b7435131fc4938.rlib" "/opt/rustwide/rustup-home/toolchains/1.49.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-9d4b6f3c097e876e.rlib" "/opt/rustwide/rustup-home/toolchains/1.49.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-3f953ad652ab829a.rlib" "-Wl,-Bdynamic"
[INFO] [stdout]   = note: /usr/bin/ld: /opt/rustwide/target/debug/deps/os-0e5417959ff13912.os.f235lpwx-cgu.4.rcgu.o: in function `_start':
[INFO] [stdout]           /opt/rustwide/workdir/src/main.rs:15: multiple definition of `_start'; /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/Scrt1.o:(.text+0x0): first defined here
[INFO] [stdout]           /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
[INFO] [stdout]           (.text+0x16): undefined reference to `__libc_csu_fini'
[INFO] [stdout]           /usr/bin/ld: (.text+0x1d): undefined reference to `__libc_csu_init'
[INFO] [stdout]           /usr/bin/ld: (.text+0x24): undefined reference to `main'
[INFO] [stdout]           /usr/bin/ld: (.text+0x2a): undefined reference to `__libc_start_main'
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `os`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "9543cccfb4fdad99e82feecdfb2b13ebdcda58e76d523064555ff309acb5633a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9543cccfb4fdad99e82feecdfb2b13ebdcda58e76d523064555ff309acb5633a", kill_on_drop: false }`
[INFO] [stdout] 9543cccfb4fdad99e82feecdfb2b13ebdcda58e76d523064555ff309acb5633a