[INFO] cloning repository https://github.com/yx208/os-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yx208/os-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyx208%2Fos-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyx208%2Fos-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7188ee6ad5741c890ed7e87622ec215f70b51480
[INFO] checking yx208/os-rs against try#2c4819a380dbddb1f2a0f4405a49fb6ed90983ae for pr-152996
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyx208%2Fos-rs" "/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] started tweaking git repo https://github.com/yx208/os-rs
[INFO] finished tweaking git repo https://github.com/yx208/os-rs
[INFO] tweaked toml for git repo https://github.com/yx208/os-rs written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/yx208/os-rs on toolchain 2c4819a380dbddb1f2a0f4405a49fb6ed90983ae
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2c4819a380dbddb1f2a0f4405a49fb6ed90983ae" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/yx208/os-rs 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" "+2c4819a380dbddb1f2a0f4405a49fb6ed90983ae" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking yx208/os-rs against try#2c4819a380dbddb1f2a0f4405a49fb6ed90983ae for pr-152996
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyx208%2Fos-rs" "/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] started tweaking git repo https://github.com/yx208/os-rs
[INFO] finished tweaking git repo https://github.com/yx208/os-rs
[INFO] tweaked toml for git repo https://github.com/yx208/os-rs written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/yx208/os-rs on toolchain 2c4819a380dbddb1f2a0f4405a49fb6ed90983ae
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2c4819a380dbddb1f2a0f4405a49fb6ed90983ae" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/yx208/os-rs 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" "+2c4819a380dbddb1f2a0f4405a49fb6ed90983ae" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bootloader v0.9.31
[INFO] [stderr]   Downloaded volatile v0.2.7
[INFO] [stderr]   Downloaded uart_16550 v0.3.2
[INFO] [stderr]   Downloaded x86_64 v0.15.2
[INFO] [stderr]   Downloaded x86 v0.52.0
[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" "+2c4819a380dbddb1f2a0f4405a49fb6ed90983ae" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 053fdaefd82aad4fbd252650ae95af78629331b770f5b102c9b8cd4d7cb5646e
[INFO] running `Command { std: "docker" "start" "-a" "053fdaefd82aad4fbd252650ae95af78629331b770f5b102c9b8cd4d7cb5646e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "053fdaefd82aad4fbd252650ae95af78629331b770f5b102c9b8cd4d7cb5646e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "053fdaefd82aad4fbd252650ae95af78629331b770f5b102c9b8cd4d7cb5646e", kill_on_drop: false }`
[INFO] [stdout] 053fdaefd82aad4fbd252650ae95af78629331b770f5b102c9b8cd4d7cb5646e
[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=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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+2c4819a380dbddb1f2a0f4405a49fb6ed90983ae" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7045fdf0077e318ade1557902016f20c74ee62b25934f178d513a9962e88b7ad
[INFO] running `Command { std: "docker" "start" "-a" "7045fdf0077e318ade1557902016f20c74ee62b25934f178d513a9962e88b7ad", kill_on_drop: false }`
[INFO] [stderr]    Compiling x86 v0.52.0
[INFO] [stderr]     Checking bit_field v0.10.2
[INFO] [stderr]     Checking raw-cpuid v10.7.0
[INFO] [stderr]    Compiling bootloader v0.9.31
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stderr]     Checking volatile v0.4.6
[INFO] [stderr]     Checking volatile v0.2.7
[INFO] [stderr]     Checking spin v0.10.0
[INFO] [stderr]     Checking lazy_static v1.5.0
[INFO] [stderr]     Checking x86_64 v0.15.2
[INFO] [stderr]     Checking uart_16550 v0.3.2
[INFO] [stderr]     Checking vm_os v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/vga_buffer.rs:143:1
[INFO] [stdout]     |
[INFO] [stdout] 143 | / /// 问题 1
[INFO] [stdout] 144 | | /// 一般的变量在运行时初始化，而静态变量在编译时初始化
[INFO] [stdout] 145 | | /// Rust 编译器规定了一个称为常量求值器（const evaluator）的组件，它应该在编译时处理这样的初始化工作
[INFO] [stdout] 146 | | /// lazy_static 宏可以定义一个延迟初始化（lazily initialized）的静态变量
[INFO] [stdout] ...   |
[INFO] [stdout] 150 | | /// 所有与写入数据相关的方法都需要实例的可变引用 "&mut self"，但 WRITER 是 不可变变量
[INFO] [stdout] 151 | | /// 使用自旋锁，提供内部可变性
[INFO] [stdout]     | |_-----------------------------^
[INFO] [stdout]     |   |
[INFO] [stdout]     |   rustdoc does not generate documentation for macro invocations
[INFO] [stdout]     |
[INFO] [stdout]     = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout]     = note: `#[warn(unused_doc_comments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/vga_buffer.rs:143:1
[INFO] [stdout]     |
[INFO] [stdout] 143 | / /// 问题 1
[INFO] [stdout] 144 | | /// 一般的变量在运行时初始化，而静态变量在编译时初始化
[INFO] [stdout] 145 | | /// Rust 编译器规定了一个称为常量求值器（const evaluator）的组件，它应该在编译时处理这样的初始化工作
[INFO] [stdout] 146 | | /// lazy_static 宏可以定义一个延迟初始化（lazily initialized）的静态变量
[INFO] [stdout] ...   |
[INFO] [stdout] 150 | | /// 所有与写入数据相关的方法都需要实例的可变引用 "&mut self"，但 WRITER 是 不可变变量
[INFO] [stdout] 151 | | /// 使用自旋锁，提供内部可变性
[INFO] [stdout]     | |_-----------------------------^
[INFO] [stdout]     |   |
[INFO] [stdout]     |   rustdoc does not generate documentation for macro invocations
[INFO] [stdout]     |
[INFO] [stdout]     = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout]     = note: `#[warn(unused_doc_comments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: unwinding panics are not supported without std
[INFO] [stdout]   |
[INFO] [stdout]   = help: using nightly cargo, use -Zbuild-std with panic="abort" to avoid unwinding
[INFO] [stdout]   = note: since the core library is usually precompiled with panic="unwind", rebuilding your crate with panic="abort" may not be enough to fix the problem
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: unwinding panics are not supported without std
[INFO] [stdout]   |
[INFO] [stdout]   = help: using nightly cargo, use -Zbuild-std with panic="abort" to avoid unwinding
[INFO] [stdout]   = note: since the core library is usually precompiled with panic="unwind", rebuilding your crate with panic="abort" may not be enough to fix the problem
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `vm_os` (bin "vm_os") due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `vm_os` (bin "vm_os" test) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "7045fdf0077e318ade1557902016f20c74ee62b25934f178d513a9962e88b7ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7045fdf0077e318ade1557902016f20c74ee62b25934f178d513a9962e88b7ad", kill_on_drop: false }`
[INFO] [stdout] 7045fdf0077e318ade1557902016f20c74ee62b25934f178d513a9962e88b7ad