[INFO] cloning repository https://github.com/kariy/os-in-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kariy/os-in-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkariy%2Fos-in-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkariy%2Fos-in-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f65d59f67aad62e45d5e32c9d4623c383bcf4e99
[INFO] testing kariy/os-in-rust against beta-2026-04-21 for beta-1.96-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkariy%2Fos-in-rust" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-4-tc2/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-4-tc2/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/kariy/os-in-rust
[INFO] finished tweaking git repo https://github.com/kariy/os-in-rust
[INFO] tweaked toml for git repo https://github.com/kariy/os-in-rust written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kariy/os-in-rust on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/kariy/os-in-rust 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" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ed52161a141ad9a1ce1d54090f4c17c221dbc64919213c12143c9ec8300f14c5
[INFO] running `Command { std: "docker" "start" "-a" "ed52161a141ad9a1ce1d54090f4c17c221dbc64919213c12143c9ec8300f14c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ed52161a141ad9a1ce1d54090f4c17c221dbc64919213c12143c9ec8300f14c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed52161a141ad9a1ce1d54090f4c17c221dbc64919213c12143c9ec8300f14c5", kill_on_drop: false }`
[INFO] [stdout] ed52161a141ad9a1ce1d54090f4c17c221dbc64919213c12143c9ec8300f14c5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 573dfb95f85aeb9f5c5e468540a41768ab83dbcbf9196f4ac7ff62c07ba277df
[INFO] running `Command { std: "docker" "start" "-a" "573dfb95f85aeb9f5c5e468540a41768ab83dbcbf9196f4ac7ff62c07ba277df", kill_on_drop: false }`
[INFO] [stderr]    Compiling bootloader v0.9.29
[INFO] [stderr]    Compiling volatile v0.2.7
[INFO] [stderr]    Compiling os-in-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: this operation will panic at runtime
[INFO] [stdout]   --> src/vga_buffer.rs:78:17
[INFO] [stdout]    |
[INFO] [stdout] 78 |                 self.buffer.chars[row][col].write(char);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^ index out of bounds: the length is 25 but the index is 79
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unconditional_panic)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]    --> src/vga_buffer.rs:109:29
[INFO] [stdout]     |
[INFO] [stdout] 109 |     fn clear_row(&mut self, row: usize) {}
[INFO] [stdout]     |                             ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[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" "/opt/rustwide/target/debug/deps/rustcU2Rf3F/symbols.o" "<1 object files omitted>" "-Wl,--as-needed" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/libvolatile-e556b0b7cc4cbe28.rlib" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib/{libcore-*,libcompiler_builtins-*}.rlib" "-L" "/opt/rustwide/target/debug/deps/rustcU2Rf3F/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/os_in_rust-67f9ebbb31abc645" "-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:23 (src/main.rs:23)
[INFO] [stdout]           >>>            /opt/rustwide/target/debug/deps/os_in_rust-67f9ebbb31abc645.os_in_rust.76818685262361d1-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 `os-in-rust` (bin "os-in-rust") due to 1 previous error; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "573dfb95f85aeb9f5c5e468540a41768ab83dbcbf9196f4ac7ff62c07ba277df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "573dfb95f85aeb9f5c5e468540a41768ab83dbcbf9196f4ac7ff62c07ba277df", kill_on_drop: false }`
[INFO] [stdout] 573dfb95f85aeb9f5c5e468540a41768ab83dbcbf9196f4ac7ff62c07ba277df
