[INFO] cloning repository https://github.com/Bush-Man/study-operating-system
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Bush-Man/study-operating-system" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBush-Man%2Fstudy-operating-system", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBush-Man%2Fstudy-operating-system'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7fa5431f08afc785b46b5e07fb7d73996d9e019e
[INFO] testing Bush-Man/study-operating-system against try#9f93af291970322f4f1c6315ccde4d7078201159 for pr-146098-6
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBush-Man%2Fstudy-operating-system" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-1-tc2/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/Bush-Man/study-operating-system
[INFO] finished tweaking git repo https://github.com/Bush-Man/study-operating-system
[INFO] tweaked toml for git repo https://github.com/Bush-Man/study-operating-system written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Bush-Man/study-operating-system on toolchain 9f93af291970322f4f1c6315ccde4d7078201159
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9f93af291970322f4f1c6315ccde4d7078201159" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Bush-Man/study-operating-system 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" "+9f93af291970322f4f1c6315ccde4d7078201159" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: file `/workspace/builds/worker-1-tc2/source/src/main.rs` found to be present in multiple build targets:
[INFO] [stderr]   * `lib` target `studyos`
[INFO] [stderr]   * `bin` target `studyos`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+9f93af291970322f4f1c6315ccde4d7078201159" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 15c8ab1f9592ee91659b724cb3d46ae826137f92df4a0f5294851c05e213c865
[INFO] running `Command { std: "docker" "start" "-a" "15c8ab1f9592ee91659b724cb3d46ae826137f92df4a0f5294851c05e213c865", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "15c8ab1f9592ee91659b724cb3d46ae826137f92df4a0f5294851c05e213c865", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15c8ab1f9592ee91659b724cb3d46ae826137f92df4a0f5294851c05e213c865", kill_on_drop: false }`
[INFO] [stdout] 15c8ab1f9592ee91659b724cb3d46ae826137f92df4a0f5294851c05e213c865
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+9f93af291970322f4f1c6315ccde4d7078201159" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0316c6e473e841e78b13bd1aa185435359176c76927974aea417d0767ac7cd48
[INFO] running `Command { std: "docker" "start" "-a" "0316c6e473e841e78b13bd1aa185435359176c76927974aea417d0767ac7cd48", kill_on_drop: false }`
[INFO] [stderr] warning: file `/opt/rustwide/workdir/src/main.rs` found to be present in multiple build targets:
[INFO] [stderr]   * `lib` target `studyos`
[INFO] [stderr]   * `bin` target `studyos`
[INFO] [stderr]    Compiling studyos v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `fmt::write`
[INFO] [stdout]  --> src/main.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | use core::{fmt::write, panic::PanicInfo};
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/main.rs:8:35
[INFO] [stdout]   |
[INFO] [stdout] 8 | use memory::multiboot_structure::{self, MultibootInfoStructure};
[INFO] [stdout]   |                                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `WORLD` is never used
[INFO] [stdout]   --> src/main.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | static WORLD:&str = "Wörld!";
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple variants are never constructed
[INFO] [stdout]   --> src/vga/writter.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub enum VgaColor {
[INFO] [stdout]    |          -------- variants in this enum
[INFO] [stdout] 11 |     Black = 0,
[INFO] [stdout] 12 |     Blue = 1,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 13 |     Green = 2,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 14 |     Cyan = 3,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 15 |     Red = 4,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 16 |     Magenta = 5,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 17 |     Brown = 6,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 18 |     LightGrey = 7,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 19 |     DarkGrey = 8,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 20 |     LightBlue = 9,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 21 |     LightGreen = 10,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 22 |     LightCyan = 11,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 23 |     LightRed = 12,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 24 |     LightMagenta = 13,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 25 |     Yellow = 14,  
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `VgaCharacter` is never constructed
[INFO] [stdout]   --> src/vga/writter.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct VgaCharacter{
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `clear_row` is never used
[INFO] [stdout]    --> src/vga/writter.rs:100:12
[INFO] [stdout]     |
[INFO] [stdout]  45 | impl VgaWriter{
[INFO] [stdout]     | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 100 |     pub fn clear_row(&mut self,row:usize){
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `GlobalWriter` is never constructed
[INFO] [stdout]  --> src/vga/global_writer.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct GlobalWriter {
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `write` are never used
[INFO] [stdout]   --> src/vga/global_writer.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout]  9 | impl GlobalWriter{
[INFO] [stdout]    | ----------------- associated items in this implementation
[INFO] [stdout] 10 |    const fn new()->Self{
[INFO] [stdout]    |             ^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     pub fn write(&self, args:fmt::Arguments){
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `GLOBAL_WRITER` is never used
[INFO] [stdout]   --> src/vga/global_writer.rs:30:13
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub static  GLOBAL_WRITER: GlobalWriter = GlobalWriter::new();
[INFO] [stdout]    |             ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `fmt::write`
[INFO] [stdout]  --> src/main.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | use core::{fmt::write, panic::PanicInfo};
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/main.rs:8:35
[INFO] [stdout]   |
[INFO] [stdout] 8 | use memory::multiboot_structure::{self, MultibootInfoStructure};
[INFO] [stdout]   |                                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `WORLD` is never used
[INFO] [stdout]   --> src/main.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | static WORLD:&str = "Wörld!";
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple variants are never constructed
[INFO] [stdout]   --> src/vga/writter.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub enum VgaColor {
[INFO] [stdout]    |          -------- variants in this enum
[INFO] [stdout] 11 |     Black = 0,
[INFO] [stdout] 12 |     Blue = 1,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 13 |     Green = 2,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 14 |     Cyan = 3,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 15 |     Red = 4,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 16 |     Magenta = 5,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 17 |     Brown = 6,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 18 |     LightGrey = 7,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 19 |     DarkGrey = 8,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 20 |     LightBlue = 9,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 21 |     LightGreen = 10,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 22 |     LightCyan = 11,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 23 |     LightRed = 12,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 24 |     LightMagenta = 13,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 25 |     Yellow = 14,  
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `VgaCharacter` is never constructed
[INFO] [stdout]   --> src/vga/writter.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct VgaCharacter{
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `clear_row` is never used
[INFO] [stdout]    --> src/vga/writter.rs:100:12
[INFO] [stdout]     |
[INFO] [stdout]  45 | impl VgaWriter{
[INFO] [stdout]     | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 100 |     pub fn clear_row(&mut self,row:usize){
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `GlobalWriter` is never constructed
[INFO] [stdout]  --> src/vga/global_writer.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct GlobalWriter {
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `write` are never used
[INFO] [stdout]   --> src/vga/global_writer.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout]  9 | impl GlobalWriter{
[INFO] [stdout]    | ----------------- associated items in this implementation
[INFO] [stdout] 10 |    const fn new()->Self{
[INFO] [stdout]    |             ^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     pub fn write(&self, args:fmt::Arguments){
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `GLOBAL_WRITER` is never used
[INFO] [stdout]   --> src/vga/global_writer.rs:30:13
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub static  GLOBAL_WRITER: GlobalWriter = GlobalWriter::new();
[INFO] [stdout]    |             ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note:  "cc" "-m64" "/tmp/rustcHefMcw/symbols.o" "<1 object files omitted>" "-Wl,--as-needed" "-Wl,-Bstatic" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib/{libcore-*,libcompiler_builtins-*}.rlib" "-L" "/tmp/rustcHefMcw/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/studyos-6977f061580b97d7" "-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: undefined symbol: rust_eh_personality
[INFO] [stdout]           >>> referenced by core.91ef86f5e1df6c36-cgu.0
[INFO] [stdout]           >>>               core-5fc89b42ad57ec54.core.91ef86f5e1df6c36-cgu.0.rcgu.o:(DW.ref.rust_eh_personality) in archive /opt/rustwide/rustup-home/toolchains/9f93af291970322f4f1c6315ccde4d7078201159/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-5fc89b42ad57ec54.rlib
[INFO] [stdout]           
[INFO] [stdout]           rust-lld: error: undefined symbol: main
[INFO] [stdout]           >>> referenced by /usr/lib/gcc/x86_64-linux-gnu/13/../../../x86_64-linux-gnu/Scrt1.o:(_start)
[INFO] [stdout]           
[INFO] [stdout]           rust-lld: error: undefined symbol: __libc_start_main
[INFO] [stdout]           >>> referenced by /usr/lib/gcc/x86_64-linux-gnu/13/../../../x86_64-linux-gnu/Scrt1.o:(_start)
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `studyos` (bin "studyos") due to 1 previous error; 9 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "0316c6e473e841e78b13bd1aa185435359176c76927974aea417d0767ac7cd48", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0316c6e473e841e78b13bd1aa185435359176c76927974aea417d0767ac7cd48", kill_on_drop: false }`
[INFO] [stdout] 0316c6e473e841e78b13bd1aa185435359176c76927974aea417d0767ac7cd48
