[INFO] cloning repository bmdelacruz/blog-os
[INFO] running `"git" "clone" "--bare" "git://github.com/bmdelacruz/blog-os.git" "work/cache/sources/gh/bmdelacruz/blog-os"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/bmdelacruz/blog-os'...
[INFO] running `"git" "clone" "work/cache/sources/gh/bmdelacruz/blog-os" "work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/bmdelacruz/blog-os"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/bmdelacruz/blog-os'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/bmdelacruz/blog-os" "work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/bmdelacruz/blog-os"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/bmdelacruz/blog-os'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8865886c90a038f5e21075858407fe4a85707cc1
[INFO] sha for GitHub repo bmdelacruz/blog-os: 8865886c90a038f5e21075858407fe4a85707cc1
[INFO] validating manifest of bmdelacruz/blog-os on toolchain master#c8865d8e195813ade6b84434ac9f8850e7112d1a
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of bmdelacruz/blog-os on toolchain try#e212b7d492c96d3837691ba29d32d5f468933fb8
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing bmdelacruz/blog-os
[INFO] finished frobbing bmdelacruz/blog-os
[INFO] frobbed toml for bmdelacruz/blog-os written to work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/bmdelacruz/blog-os/Cargo.toml
[INFO] started frobbing bmdelacruz/blog-os
[INFO] finished frobbing bmdelacruz/blog-os
[INFO] frobbed toml for bmdelacruz/blog-os written to work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/bmdelacruz/blog-os/Cargo.toml
[INFO] crate bmdelacruz/blog-os already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded x86_64 v0.5.2
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing bmdelacruz/blog-os against master#c8865d8e195813ade6b84434ac9f8850e7112d1a for pr-61629
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-0/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/bmdelacruz/blog-os:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "build" "--frozen"`
[INFO] [stdout] 9cb737edb3593456b7fbca364b65364cb3b94e2e9e6672fd2b53ea1829f31a16
[INFO] running `"docker" "start" "-a" "9cb737edb3593456b7fbca364b65364cb3b94e2e9e6672fd2b53ea1829f31a16"`
[INFO] [stderr]    Compiling nodrop v0.1.13
[INFO] [stderr]    Compiling os_bootinfo v0.2.1
[INFO] [stderr]    Compiling zero v0.1.2
[INFO] [stderr]    Compiling usize_conversions v0.2.0
[INFO] [stderr]    Compiling ux v0.1.3
[INFO] [stderr]    Compiling bitflags v1.0.4
[INFO] [stderr]    Compiling bit_field v0.9.0
[INFO] [stderr]    Compiling cpuio v0.2.0
[INFO] [stderr]    Compiling font8x8 v0.2.4
[INFO] [stderr]    Compiling spin v0.5.0
[INFO] [stderr]    Compiling pc-keyboard v0.3.1
[INFO] [stderr]    Compiling volatile v0.2.6
[INFO] [stderr]    Compiling array-init v0.0.4
[INFO] [stderr]    Compiling pic8259_simple v0.1.1
[INFO] [stderr]    Compiling xmas-elf v0.6.2
[INFO] [stderr]    Compiling pulldown-cmark v0.0.3
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling raw-cpuid v6.1.0
[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 v0.3.6
[INFO] [stderr]    Compiling x86_64 v0.2.14
[INFO] [stderr]    Compiling x86_64 v0.5.2
[INFO] [stderr]    Compiling bootloader v0.4.0
[INFO] [stderr]    Compiling uart_16550 v0.1.0
[INFO] [stderr]    Compiling blog_os v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: the item `Mutex` is imported redundantly
[INFO] [stderr]   --> src/interrupts.rs:81:7
[INFO] [stderr]    |
[INFO] [stderr] 7  | use spin::Mutex;
[INFO] [stderr]    |     ----------- the item `Mutex` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 81 |   use spin::Mutex;
[INFO] [stderr]    |       ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/vga_buffer.rs:65:13
[INFO] [stderr]    |
[INFO] [stderr] 65 |         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] warning: unused import: `blog_os::serial_println`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use blog_os::serial_println;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] 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/crater/rustup-home/toolchains/c8865d8e195813ade6b84434ac9f8850e7112d1a-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.0.rcgu.o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.1.rcgu.o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.10.rcgu.o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.11.rcgu.o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.12.rcgu.o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.13.rcgu.o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.14.rcgu.o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.15.rcgu.o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.2.rcgu.o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.3.rcgu.o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.4.rcgu.o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.5.rcgu.o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.6.rcgu.o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.7.rcgu.o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.8.rcgu.o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.9.rcgu.o" "-o" "/opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/crater/target/debug/deps" "-L" "/opt/crater/rustup-home/toolchains/c8865d8e195813ade6b84434ac9f8850e7112d1a-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/crater/target/debug/deps/libblog_os-533d1062c51397eb.rlib" "/opt/crater/target/debug/deps/libvolatile-6a915f8499b18303.rlib" "/opt/crater/target/debug/deps/libuart_16550-5fdc37babb9adeac.rlib" "/opt/crater/target/debug/deps/libx86_64-10764bf81c4b5455.rlib" "/opt/crater/target/debug/deps/libos_bootinfo-6883e6295ce88624.rlib" "/opt/crater/target/debug/deps/libbootloader-a3c858b2df5ccd8d.rlib" "/opt/crater/target/debug/deps/libpc_keyboard-1f912b51f4910873.rlib" "/opt/crater/target/debug/deps/libspin-57c8e959dd0f660a.rlib" "/opt/crater/target/debug/deps/libpic8259_simple-cf8afcc3918b371f.rlib" "/opt/crater/target/debug/deps/libcpuio-73d140bfdf9c3171.rlib" "/opt/crater/target/debug/deps/libx86_64-2ad9076ca9c76070.rlib" "/opt/crater/target/debug/deps/libraw_cpuid-08428c2289913c20.rlib" "/opt/crater/target/debug/deps/libarray_init-5eab4694537b72d6.rlib" "/opt/crater/target/debug/deps/libnodrop-b793c3a5ecf3a777.rlib" "/opt/crater/target/debug/deps/libusize_conversions-5bdded72cf5c7f56.rlib" "/opt/crater/target/debug/deps/libbit_field-e159bee715eaf616.rlib" "/opt/crater/target/debug/deps/libbitflags-289aea101accda3b.rlib" "/opt/crater/target/debug/deps/libux-14d6b07fe4d9b5f0.rlib" "/opt/crater/target/debug/deps/liblazy_static-91accc0800bd58fd.rlib" "/opt/crater/target/debug/deps/libspin-24fbb085c8fd56ba.rlib" "/opt/crater/rustup-home/toolchains/c8865d8e195813ade6b84434ac9f8850e7112d1a-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-5d5836de4a922af7.rlib" "/opt/crater/rustup-home/toolchains/c8865d8e195813ade6b84434ac9f8850e7112d1a-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-0bd990bd23dec0da.rlib" "/opt/crater/rustup-home/toolchains/c8865d8e195813ade6b84434ac9f8850e7112d1a-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-f5a50a9afbc6d167.rlib" "-Wl,-Bdynamic"
[INFO] [stderr]   = note: /opt/crater/target/debug/deps/blog_os-5a2bac99dca9c657.blog_os.eix1wse7-cgu.4.rcgu.o: In function `_start':
[INFO] [stderr]           /opt/crater/workdir/<::bootloader::entry_point macros>:2: multiple definition of `_start'
[INFO] [stderr]           /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/Scrt1.o:(.text+0x0): first defined here
[INFO] [stderr]           /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
[INFO] [stderr]           (.text+0x12): undefined reference to `__libc_csu_fini'
[INFO] [stderr]           /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
[INFO] [stderr]           (.text+0x19): undefined reference to `__libc_csu_init'
[INFO] [stderr]           /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
[INFO] [stderr]           (.text+0x20): undefined reference to `main'
[INFO] [stderr]           /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
[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
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `blog_os`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "9cb737edb3593456b7fbca364b65364cb3b94e2e9e6672fd2b53ea1829f31a16"`
[INFO] running `"docker" "rm" "-f" "9cb737edb3593456b7fbca364b65364cb3b94e2e9e6672fd2b53ea1829f31a16"`
[INFO] [stdout] 9cb737edb3593456b7fbca364b65364cb3b94e2e9e6672fd2b53ea1829f31a16