[INFO] cloning repository https://github.com/BearzRobotics/fenrirs_os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/BearzRobotics/fenrirs_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBearzRobotics%2Ffenrirs_os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBearzRobotics%2Ffenrirs_os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ec7ef6a7014362254dd44b7cd41b07fbb81f206d
[INFO] testing BearzRobotics/fenrirs_os against try#03a1ea71b075ab964b5278bc6e74cd6c52c36ee0 for pr-74409
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBearzRobotics%2Ffenrirs_os" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/BearzRobotics/fenrirs_os on toolchain 03a1ea71b075ab964b5278bc6e74cd6c52c36ee0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/BearzRobotics/fenrirs_os
[INFO] finished tweaking git repo https://github.com/BearzRobotics/fenrirs_os
[INFO] tweaked toml for git repo https://github.com/BearzRobotics/fenrirs_os written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/BearzRobotics/fenrirs_os already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 95916de75a9fd385251d3aafdbe782e1bf13b7ee87324a3985921abbd798014f
[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" "95916de75a9fd385251d3aafdbe782e1bf13b7ee87324a3985921abbd798014f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "95916de75a9fd385251d3aafdbe782e1bf13b7ee87324a3985921abbd798014f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "95916de75a9fd385251d3aafdbe782e1bf13b7ee87324a3985921abbd798014f", kill_on_drop: false }`
[INFO] [stdout] 95916de75a9fd385251d3aafdbe782e1bf13b7ee87324a3985921abbd798014f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4158a329444ab7189d0b75d3a1a68e97bb6fc346a19770e66ed1030fb75b5561
[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" "4158a329444ab7189d0b75d3a1a68e97bb6fc346a19770e66ed1030fb75b5561", kill_on_drop: false }`
[INFO] [stderr]    Compiling bootloader v0.8.0
[INFO] [stderr]    Compiling spin v0.5.1
[INFO] [stderr]    Compiling spin v0.4.10
[INFO] [stderr]    Compiling volatile v0.2.6
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling fenrirs_os v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Write` is imported redundantly
[INFO] [stdout]    --> src/vga_buffer.rs:152:9
[INFO] [stdout]     |
[INFO] [stdout] 3   | use core::fmt::Write;
[INFO] [stdout]     |     ---------------- the item `Write` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 152 |     use core::fmt::Write;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/main.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     panic!("Some panic message");
[INFO] [stdout]    |     ----------------------------- any code following this expression is unreachable
[INFO] [stdout] 21 |     loop {}
[INFO] [stdout]    |     ^^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::fmt::Write`
[INFO] [stdout]  --> src/vga_buffer.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use core::fmt::Write;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[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/03a1ea71b075ab964b5278bc6e74cd6c52c36ee0/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.10.rcgu.o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.11.rcgu.o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.12.rcgu.o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.13.rcgu.o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.14.rcgu.o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.15.rcgu.o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.9.rcgu.o" "-o" "/opt/rustwide/target/debug/deps/fenrirs_os-0cebb3833ee91cec" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/rustup-home/toolchains/03a1ea71b075ab964b5278bc6e74cd6c52c36ee0/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/liblazy_static-ca32a3f3de11e965.rlib" "/opt/rustwide/target/debug/deps/libspin-0c4005ab0199a821.rlib" "/opt/rustwide/target/debug/deps/libspin-3dc3cfef66620128.rlib" "/opt/rustwide/target/debug/deps/libvolatile-4d05b93ec8397c6b.rlib" "/opt/rustwide/rustup-home/toolchains/03a1ea71b075ab964b5278bc6e74cd6c52c36ee0/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-68f423c59dc48a40.rlib" "/opt/rustwide/rustup-home/toolchains/03a1ea71b075ab964b5278bc6e74cd6c52c36ee0/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-54580c7798bf2225.rlib" "/opt/rustwide/rustup-home/toolchains/03a1ea71b075ab964b5278bc6e74cd6c52c36ee0/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/fenrirs_os-0cebb3833ee91cec.fenrirs_os.e6421n6a-cgu.5.rcgu.o: in function `_start':
[INFO] [stdout]           /opt/rustwide/workdir/src/main.rs:18: 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; 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fenrirs_os`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "4158a329444ab7189d0b75d3a1a68e97bb6fc346a19770e66ed1030fb75b5561", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4158a329444ab7189d0b75d3a1a68e97bb6fc346a19770e66ed1030fb75b5561", kill_on_drop: false }`
[INFO] [stdout] 4158a329444ab7189d0b75d3a1a68e97bb6fc346a19770e66ed1030fb75b5561