[INFO] cloning repository https://github.com/dermotfrost/rust_os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dermotfrost/rust_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdermotfrost%2Frust_os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdermotfrost%2Frust_os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e03adf09185e3d2b0d00348506623a8b70f434d4
[INFO] testing dermotfrost/rust_os against try#ce59db7a1b1b012fb2793c4641c1bdecad7a128b for pr-85530
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdermotfrost%2Frust_os" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dermotfrost/rust_os on toolchain ce59db7a1b1b012fb2793c4641c1bdecad7a128b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-3/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/dermotfrost/rust_os
[INFO] finished tweaking git repo https://github.com/dermotfrost/rust_os
[INFO] tweaked toml for git repo https://github.com/dermotfrost/rust_os written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/dermotfrost/rust_os already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded volatile v0.2.7
[INFO] [stderr]   Downloaded bootloader v0.9.17
[INFO] [stderr]   Downloaded spin v0.5.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5c080c4dcf2cb877f3f6e7e8b8728a8a00be8404da12ed149c10af6f87c65a76
[INFO] running `Command { std: "docker" "start" "-a" "5c080c4dcf2cb877f3f6e7e8b8728a8a00be8404da12ed149c10af6f87c65a76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5c080c4dcf2cb877f3f6e7e8b8728a8a00be8404da12ed149c10af6f87c65a76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5c080c4dcf2cb877f3f6e7e8b8728a8a00be8404da12ed149c10af6f87c65a76", kill_on_drop: false }`
[INFO] [stdout] 5c080c4dcf2cb877f3f6e7e8b8728a8a00be8404da12ed149c10af6f87c65a76
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 56b0e9f4c347c5469e58074f9906e55fbdb5ba40bac27a536d2555074b872f24
[INFO] running `Command { std: "docker" "start" "-a" "56b0e9f4c347c5469e58074f9906e55fbdb5ba40bac27a536d2555074b872f24", kill_on_drop: false }`
[INFO] [stderr]    Compiling bootloader v0.9.17
[INFO] [stderr]    Compiling spin v0.5.2
[INFO] [stderr]    Compiling volatile v0.2.7
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling rust_os v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `print_something`
[INFO] [stdout]    --> src/vga_buffer.rs:122:8
[INFO] [stdout]     |
[INFO] [stdout] 122 | pub fn print_something() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: "cc" "-m64" "-Wl,--eh-frame-hdr" "-Wl,-znoexecstack" "-Wl,--as-needed" "-L" "/opt/rustwide/rustup-home/toolchains/ce59db7a1b1b012fb2793c4641c1bdecad7a128b/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.10.rcgu.o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.11.rcgu.o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.12.rcgu.o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.13.rcgu.o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.14.rcgu.o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.15.rcgu.o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.9.rcgu.o" "-o" "/opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/rustup-home/toolchains/ce59db7a1b1b012fb2793c4641c1bdecad7a128b/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/liblazy_static-b41dfd6e0da298c8.rlib" "/opt/rustwide/target/debug/deps/libspin-43076b80fad52865.rlib" "/opt/rustwide/target/debug/deps/libvolatile-8c04ad047f6b2ee1.rlib" "/opt/rustwide/rustup-home/toolchains/ce59db7a1b1b012fb2793c4641c1bdecad7a128b/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-a1fd7734706d5518.rlib" "/opt/rustwide/rustup-home/toolchains/ce59db7a1b1b012fb2793c4641c1bdecad7a128b/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-c8ded1707ad10767.rlib" "/opt/rustwide/rustup-home/toolchains/ce59db7a1b1b012fb2793c4641c1bdecad7a128b/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-1eec8756baa5bc24.rlib" "-Wl,-Bdynamic"
[INFO] [stdout]   = note: /usr/bin/ld: /opt/rustwide/target/debug/deps/rust_os-d69cf6e1d71dbdb6.rust_os.8t5pb76y-cgu.6.rcgu.o: in function `_start':
[INFO] [stdout]           /opt/rustwide/workdir/src/main.rs:9: 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; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_os`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "56b0e9f4c347c5469e58074f9906e55fbdb5ba40bac27a536d2555074b872f24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "56b0e9f4c347c5469e58074f9906e55fbdb5ba40bac27a536d2555074b872f24", kill_on_drop: false }`
[INFO] [stdout] 56b0e9f4c347c5469e58074f9906e55fbdb5ba40bac27a536d2555074b872f24