[INFO] crate rustos 0.4.3 is already in cache
[INFO] testing rustos-0.4.3 against master#28742a1146f10a4f09369baad027a464acb7a766 for pr-71274
[INFO] extracting crate rustos 0.4.3 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate rustos 0.4.3 on toolchain 28742a1146f10a4f09369baad027a464acb7a766
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate rustos 0.4.3
[INFO] finished tweaking crates.io crate rustos 0.4.3
[INFO] tweaked toml for crates.io crate rustos 0.4.3 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate rustos 0.4.3 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-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 5e9e61ed973a8a8a97f83abdc4936f9b437f6eea528b57fbca4f52edf5e29646
[INFO] running `"docker" "start" "-a" "5e9e61ed973a8a8a97f83abdc4936f9b437f6eea528b57fbca4f52edf5e29646"`
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling x86_64 v0.9.6
[INFO] [stderr]    Compiling bit_field v0.9.0
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling bootloader v0.9.0
[INFO] [stderr]    Compiling spin v0.5.2
[INFO] [stderr]    Compiling futures-task v0.3.4
[INFO] [stderr]    Compiling futures-core v0.3.4
[INFO] [stderr]    Compiling pin-utils v0.1.0-alpha.4
[INFO] [stderr]    Compiling cpuio v0.2.0
[INFO] [stderr]    Compiling conquer-util v0.2.0
[INFO] [stderr]    Compiling pc-keyboard v0.5.0
[INFO] [stderr]    Compiling volatile v0.2.6
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling lock_api v0.3.3
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling futures-util v0.3.4
[INFO] [stderr]    Compiling pic8259_simple v0.1.1
[INFO] [stderr]    Compiling conquer-once v0.2.0
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling spinning_top v0.1.0
[INFO] [stderr]    Compiling linked_list_allocator v0.8.2
[INFO] [stderr]    Compiling crossbeam-queue v0.2.1
[INFO] [stderr]    Compiling uart_16550 v0.2.4
[INFO] [stderr]    Compiling rustos v0.4.3 (/opt/rustwide/workdir)
[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/rustos-e13eb9f5190f99d2.rustos.awj7xkfc-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/rustos-e13eb9f5190f99d2.rustos.awj7xkfc-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/rustos-e13eb9f5190f99d2.rustos.awj7xkfc-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/rustos-e13eb9f5190f99d2.rustos.awj7xkfc-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/rustos-e13eb9f5190f99d2.rustos.awj7xkfc-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/rustos-e13eb9f5190f99d2.rustos.awj7xkfc-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/rustos-e13eb9f5190f99d2.rustos.awj7xkfc-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/rustos-e13eb9f5190f99d2.rustos.awj7xkfc-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/rustos-e13eb9f5190f99d2.rustos.awj7xkfc-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/rustos-e13eb9f5190f99d2.rustos.awj7xkfc-cgu.9.rcgu.o" "-o" "/opt/rustwide/target/debug/deps/rustos-e13eb9f5190f99d2" "/opt/rustwide/target/debug/deps/rustos-e13eb9f5190f99d2.1fi4rdtynyxm1tou.rcgu.o" "-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/librustos-220e7498778eca4d.rlib" "/opt/rustwide/target/debug/deps/libpc_keyboard-0ff3ed1de402fbea.rlib" "/opt/rustwide/target/debug/deps/libfutures_util-923a53e02294043e.rlib" "/opt/rustwide/target/debug/deps/libfutures_task-3a49394ff95cd944.rlib" "/opt/rustwide/target/debug/deps/libpin_utils-1bb4084daaf6216a.rlib" "/opt/rustwide/target/debug/deps/libfutures_core-f9120c5a4ea99a95.rlib" "/opt/rustwide/target/debug/deps/libconquer_once-f4ff289dd2336487.rlib" "/opt/rustwide/target/debug/deps/libcrossbeam_queue-4ff5aa97ffb3fd1f.rlib" "/opt/rustwide/target/debug/deps/libcrossbeam_utils-8096b24520875bd4.rlib" "/opt/rustwide/target/debug/deps/libcfg_if-affe8abda319cc43.rlib" "/opt/rustwide/target/debug/deps/libvolatile-286044c6d619dcf3.rlib" "/opt/rustwide/target/debug/deps/libuart_16550-aca5c823563c4d7c.rlib" "/opt/rustwide/target/debug/deps/libpic8259_simple-b0c36641067d4f15.rlib" "/opt/rustwide/target/debug/deps/libcpuio-d679d045f3f5d1c4.rlib" "/opt/rustwide/target/debug/deps/liblinked_list_allocator-fe6de7e24b30eca5.rlib" "/opt/rustwide/target/debug/deps/libspinning_top-30b08c57f6f0421a.rlib" "/opt/rustwide/target/debug/deps/liblock_api-4bd71503b6972356.rlib" "/opt/rustwide/target/debug/deps/libscopeguard-55dc4f468b0e60ef.rlib" "/opt/rustwide/rustup-home/toolchains/28742a1146f10a4f09369baad027a464acb7a766/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-3aec7f88778e912a.rlib" "/opt/rustwide/target/debug/deps/libx86_64-335174e4e8f9cdfb.rlib" "/opt/rustwide/target/debug/deps/libbit_field-8ac51ce003a1adbd.rlib" "/opt/rustwide/target/debug/deps/libbitflags-0c86159f485f5ff4.rlib" "/opt/rustwide/target/debug/deps/liblazy_static-4c5ae24fb7390f75.rlib" "/opt/rustwide/target/debug/deps/libspin-ea2f960a0262cbef.rlib" "/opt/rustwide/target/debug/deps/libbootloader-c0ac751d5e8216b2.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/rustos-e13eb9f5190f99d2.rustos.awj7xkfc-cgu.6.rcgu.o: In function `_start':
[INFO] [stderr]           /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/bootloader-0.9.0/src/lib.rs:35: 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
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `rustos`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "5e9e61ed973a8a8a97f83abdc4936f9b437f6eea528b57fbca4f52edf5e29646"`
[INFO] running `"docker" "rm" "-f" "5e9e61ed973a8a8a97f83abdc4936f9b437f6eea528b57fbca4f52edf5e29646"`
[INFO] [stdout] 5e9e61ed973a8a8a97f83abdc4936f9b437f6eea528b57fbca4f52edf5e29646