[INFO] updating cached repository https://github.com/ejlangev/rust_os
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c103789ef4f17e09976108402bc57b5fe09534b6
[INFO] testing ejlangev/rust_os against master#28742a1146f10a4f09369baad027a464acb7a766 for pr-71274
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fejlangev%2Frust_os" "/workspace/builds/worker-2/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ejlangev/rust_os on toolchain 28742a1146f10a4f09369baad027a464acb7a766
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/ejlangev/rust_os
[INFO] finished tweaking git repo https://github.com/ejlangev/rust_os
[INFO] tweaked toml for git repo https://github.com/ejlangev/rust_os written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/ejlangev/rust_os already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "/opt/rustwide/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 51892aa167910f2836bff2dcb63d30e97caa3b006c1512ff1d524377a7ef0ca8
[INFO] running `"docker" "start" "-a" "51892aa167910f2836bff2dcb63d30e97caa3b006c1512ff1d524377a7ef0ca8"`
[INFO] [stderr]    Compiling remove_dir_all v0.5.1
[INFO] [stderr]    Compiling usize_conversions v0.2.0
[INFO] [stderr]    Compiling ux v0.1.2
[INFO] [stderr]    Compiling bitflags v1.0.4
[INFO] [stderr]    Compiling bit_field v0.9.0
[INFO] [stderr]    Compiling zero v0.1.2
[INFO] [stderr]    Compiling os_bootinfo v0.2.1
[INFO] [stderr]    Compiling font8x8 v0.2.4
[INFO] [stderr]    Compiling spin v0.4.10
[INFO] [stderr]    Compiling volatile v0.2.5
[INFO] [stderr]    Compiling getopts v0.2.18
[INFO] [stderr]    Compiling xmas-elf v0.6.2
[INFO] [stderr]    Compiling rand v0.4.3
[INFO] [stderr]    Compiling lazy_static v1.2.0
[INFO] [stderr]    Compiling pulldown-cmark v0.0.3
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling skeptic v0.5.0
[INFO] [stderr]    Compiling fixedvec v0.2.3
[INFO] [stderr]    Compiling x86_64 v0.2.14
[INFO] [stderr]    Compiling bootloader v0.3.7
[INFO] [stderr]    Compiling ethan_os v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/vga_buffer/mod.rs:75:50
[INFO] [stderr]    |
[INFO] [stderr] 75 |   fn with_color(&mut self, color: ColorCode, f: &Fn(&mut Self)) {
[INFO] [stderr]    |                                                  ^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&mut Self)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/vga_buffer/mod.rs:86:13
[INFO] [stderr]    |
[INFO] [stderr] 86 |         0x20...0x7e | b'\n' => self.write_byte(byte),
[INFO] [stderr]    |             ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: linking with `cc` failed: exit code: 1
[INFO] [stderr]   |
[INFO] [stderr]   = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-L" "/opt/rustwide/rustup-home/toolchains/28742a1146f10a4f09369baad027a464acb7a766/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.10.rcgu.o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.11.rcgu.o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.12.rcgu.o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.13.rcgu.o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.14.rcgu.o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.15.rcgu.o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.9.rcgu.o" "-o" "/opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/rustup-home/toolchains/28742a1146f10a4f09369baad027a464acb7a766/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/libvolatile-7072e99b8ff35d29.rlib" "/opt/rustwide/target/debug/deps/liblazy_static-0e4372053c1d42f7.rlib" "/opt/rustwide/target/debug/deps/libspin-79181cbb5b4b7227.rlib" "/opt/rustwide/rustup-home/toolchains/28742a1146f10a4f09369baad027a464acb7a766/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-b6806800b307d4b9.rlib" "/opt/rustwide/rustup-home/toolchains/28742a1146f10a4f09369baad027a464acb7a766/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-e49d7651b12f7563.rlib" "/opt/rustwide/rustup-home/toolchains/28742a1146f10a4f09369baad027a464acb7a766/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-e8266574e26adcc3.rlib" "-Wl,-Bdynamic"
[INFO] [stderr]   = note: /opt/rustwide/target/debug/deps/ethan_os-7d1a77c967c9818f.ethan_os.9zc9dg3u-cgu.2.rcgu.o: In function `_start':
[INFO] [stderr]           /opt/rustwide/workdir/src/main.rs:22: multiple definition of `_start'
[INFO] [stderr]           /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/Scrt1.o:(.text+0x0): first defined here
[INFO] [stderr]           /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
[INFO] [stderr]           (.text+0x12): undefined reference to `__libc_csu_fini'
[INFO] [stderr]           (.text+0x19): undefined reference to `__libc_csu_init'
[INFO] [stderr]           (.text+0x20): undefined reference to `main'
[INFO] [stderr]           (.text+0x26): undefined reference to `__libc_start_main'
[INFO] [stderr]           collect2: error: ld returned 1 exit status
[INFO] [stderr]           
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `ethan_os`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "51892aa167910f2836bff2dcb63d30e97caa3b006c1512ff1d524377a7ef0ca8"`
[INFO] running `"docker" "rm" "-f" "51892aa167910f2836bff2dcb63d30e97caa3b006c1512ff1d524377a7ef0ca8"`
[INFO] [stdout] 51892aa167910f2836bff2dcb63d30e97caa3b006c1512ff1d524377a7ef0ca8