[INFO] cloning repository https://github.com/abbychau/a_core
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/abbychau/a_core" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabbychau%2Fa_core", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabbychau%2Fa_core'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cf22720717cc9dbf9abc4e681d2827619c68646e
[INFO] testing abbychau/a_core against master#cdb45c87e2cd43495379f7e867e3cc15dcee9f93 for pr-145838-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabbychau%2Fa_core" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-2-tc1/source/.cargo/config
[INFO] started tweaking git repo https://github.com/abbychau/a_core
[INFO] finished tweaking git repo https://github.com/abbychau/a_core
[INFO] tweaked toml for git repo https://github.com/abbychau/a_core written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/abbychau/a_core on toolchain cdb45c87e2cd43495379f7e867e3cc15dcee9f93
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/abbychau/a_core 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" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded volatile v0.2.6
[INFO] [stderr]   Downloaded bootloader v0.9.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 70e547799e07ea8461f506f1a80faf0c14f97b32219df27a95b3cb95a413cdcf
[INFO] running `Command { std: "docker" "start" "-a" "70e547799e07ea8461f506f1a80faf0c14f97b32219df27a95b3cb95a413cdcf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "70e547799e07ea8461f506f1a80faf0c14f97b32219df27a95b3cb95a413cdcf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70e547799e07ea8461f506f1a80faf0c14f97b32219df27a95b3cb95a413cdcf", kill_on_drop: false }`
[INFO] [stdout] 70e547799e07ea8461f506f1a80faf0c14f97b32219df27a95b3cb95a413cdcf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d5e429fd0332a81502a4af877f692abddea8b429b6cecc0d582a63919d9c97a7
[INFO] running `Command { std: "docker" "start" "-a" "d5e429fd0332a81502a4af877f692abddea8b429b6cecc0d582a63919d9c97a7", kill_on_drop: false }`
[INFO] [stderr]    Compiling bootloader v0.9.2
[INFO] [stderr]    Compiling volatile v0.2.6
[INFO] [stderr]    Compiling a_core v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]   --> src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub extern fn _start() -> ! {
[INFO] [stdout]    |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(missing_abi)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> src/vga_buffer.rs:115:13
[INFO] [stdout]     |
[INFO] [stdout] 115 |         Err(e)=>{writer.write_string("ello! ");}
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note:  "cc" "-m64" "/tmp/rustcnYThrI/symbols.o" "<1 object files omitted>" "-Wl,--as-needed" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/libvolatile-556f972c18be58f5.rlib" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib/{libcore-*,libcompiler_builtins-*}.rlib" "-L" "/tmp/rustcnYThrI/raw-dylibs" "-Wl,-Bdynamic" "-B<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-fuse-ld=lld" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/opt/rustwide/target/debug/deps/a_core-94e3644dc33fbaa7" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs"
[INFO] [stdout]   = note: some arguments are omitted. use `--verbose` to show all linker arguments
[INFO] [stdout]   = note: rust-lld: error: duplicate symbol: _start
[INFO] [stdout]           >>> defined at /usr/lib/gcc/x86_64-linux-gnu/13/../../../x86_64-linux-gnu/Scrt1.o:(_start)
[INFO] [stdout]           >>> defined at main.rs:13 (src/main.rs:13)
[INFO] [stdout]           >>>            /opt/rustwide/target/debug/deps/a_core-94e3644dc33fbaa7.a_core.6a066287810277f7-cgu.0.rcgu.o:(.text._start+0x0)
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `a_core` (bin "a_core") due to 1 previous error; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "d5e429fd0332a81502a4af877f692abddea8b429b6cecc0d582a63919d9c97a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5e429fd0332a81502a4af877f692abddea8b429b6cecc0d582a63919d9c97a7", kill_on_drop: false }`
[INFO] [stdout] d5e429fd0332a81502a4af877f692abddea8b429b6cecc0d582a63919d9c97a7