[INFO] cloning repository https://github.com/tomyamkum/blog_os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tomyamkum/blog_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftomyamkum%2Fblog_os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftomyamkum%2Fblog_os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 137760db74d5463e8f1f49cd9361c9e67860216a
[INFO] testing tomyamkum/blog_os against master#8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e for pr-74409
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftomyamkum%2Fblog_os" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
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[INFO] validating manifest of git repo https://github.com/tomyamkum/blog_os on toolchain 8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-5/source/.cargo/config
[INFO] started tweaking git repo https://github.com/tomyamkum/blog_os
[INFO] finished tweaking git repo https://github.com/tomyamkum/blog_os
[INFO] tweaked toml for git repo https://github.com/tomyamkum/blog_os written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/tomyamkum/blog_os already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 753ebcd2c0b49e33cb14102da34123b759a1fa0b50dc82b27d9ffb0fc5a14789
[INFO] running `Command { std: "docker" "start" "-a" "753ebcd2c0b49e33cb14102da34123b759a1fa0b50dc82b27d9ffb0fc5a14789", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "753ebcd2c0b49e33cb14102da34123b759a1fa0b50dc82b27d9ffb0fc5a14789", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "753ebcd2c0b49e33cb14102da34123b759a1fa0b50dc82b27d9ffb0fc5a14789", kill_on_drop: false }`
[INFO] [stdout] 753ebcd2c0b49e33cb14102da34123b759a1fa0b50dc82b27d9ffb0fc5a14789
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e1e3fbc638d50c976f22abf1d300ab7bb51b94f9b701f7403f3260e457c1a4e0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e1e3fbc638d50c976f22abf1d300ab7bb51b94f9b701f7403f3260e457c1a4e0", kill_on_drop: false }`
[INFO] [stderr]    Compiling bootloader v0.8.0
[INFO] [stderr]    Compiling spin v0.5.2
[INFO] [stderr]    Compiling volatile v0.2.6
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling blog_os v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/main.rs:14:2
[INFO] [stdout]    |
[INFO] [stdout] 13 |     panic!("Some panic mesage");
[INFO] [stdout]    |     ---------------------------- any code following this expression is unreachable
[INFO] [stdout] 14 |     loop {}
[INFO] [stdout]    |     ^^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static is never used: `HELLO`
[INFO] [stdout]  --> src/main.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | static HELLO: &[u8] = b"Hello World!";
[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 code: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-Wl,--eh-frame-hdr" "-L" "/opt/rustwide/rustup-home/toolchains/8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.10.rcgu.o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.11.rcgu.o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.12.rcgu.o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.13.rcgu.o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.14.rcgu.o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.15.rcgu.o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.9.rcgu.o" "-o" "/opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/rustup-home/toolchains/8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/liblazy_static-63fcdb5dcf52087e.rlib" "/opt/rustwide/target/debug/deps/libspin-95ac90917f360d31.rlib" "/opt/rustwide/target/debug/deps/libvolatile-4d05b93ec8397c6b.rlib" "/opt/rustwide/rustup-home/toolchains/8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-68f423c59dc48a40.rlib" "/opt/rustwide/rustup-home/toolchains/8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-54580c7798bf2225.rlib" "/opt/rustwide/rustup-home/toolchains/8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-95a4d456339b7385.rlib" "-Wl,-Bdynamic"
[INFO] [stdout]   = note: /usr/bin/ld: /opt/rustwide/target/debug/deps/blog_os-1b1f7c2c7a82b480.blog_os.2vmtczdp-cgu.4.rcgu.o: in function `_start':
[INFO] [stdout]           /opt/rustwide/workdir/src/main.rs:11: 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; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `blog_os`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "e1e3fbc638d50c976f22abf1d300ab7bb51b94f9b701f7403f3260e457c1a4e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1e3fbc638d50c976f22abf1d300ab7bb51b94f9b701f7403f3260e457c1a4e0", kill_on_drop: false }`
[INFO] [stdout] e1e3fbc638d50c976f22abf1d300ab7bb51b94f9b701f7403f3260e457c1a4e0