[INFO] cloning repository https://github.com/hoyley/koans-rust [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hoyley/koans-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhoyley%2Fkoans-rust", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhoyley%2Fkoans-rust'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 1a10ea949df9397eccea9049e03ea8e6ae3cd69e [INFO] checking hoyley/koans-rust against master#c919f490bbcd2b29b74016101f7ec71aaa24bdbb for pr-79073 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhoyley%2Fkoans-rust" "/workspace/builds/worker-4/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/hoyley/koans-rust on toolchain c919f490bbcd2b29b74016101f7ec71aaa24bdbb [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c919f490bbcd2b29b74016101f7ec71aaa24bdbb" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/hoyley/koans-rust [INFO] finished tweaking git repo https://github.com/hoyley/koans-rust [INFO] tweaked toml for git repo https://github.com/hoyley/koans-rust written to /workspace/builds/worker-4/source/Cargo.toml [INFO] crate git repo https://github.com/hoyley/koans-rust already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c919f490bbcd2b29b74016101f7ec71aaa24bdbb" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "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" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+c919f490bbcd2b29b74016101f7ec71aaa24bdbb" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 8bb92b70fdeeeecb4bbacde4047bc09b6026ca89624c3f08354fa3926ae3a160 [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" "8bb92b70fdeeeecb4bbacde4047bc09b6026ca89624c3f08354fa3926ae3a160", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "8bb92b70fdeeeecb4bbacde4047bc09b6026ca89624c3f08354fa3926ae3a160", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "8bb92b70fdeeeecb4bbacde4047bc09b6026ca89624c3f08354fa3926ae3a160", kill_on_drop: false }` [INFO] [stdout] 8bb92b70fdeeeecb4bbacde4047bc09b6026ca89624c3f08354fa3926ae3a160 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "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" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+c919f490bbcd2b29b74016101f7ec71aaa24bdbb" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] c75b001356aa40abf302681c3b784a57f12278989bd1a9c905dc54c99469c2af [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" "c75b001356aa40abf302681c3b784a57f12278989bd1a9c905dc54c99469c2af", kill_on_drop: false }` [INFO] [stderr] Compiling koans v0.2.2 (/opt/rustwide/workdir) [INFO] [stderr] error: failed to run custom build command for `koans v0.2.2 (/opt/rustwide/workdir)` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] process didn't exit successfully: `/opt/rustwide/target/debug/build/koans-931f66dd848e824c/build-script-build` (exit code: 101) [INFO] [stderr] --- stderr [INFO] [stderr] thread 'main' panicked at 'Read-only file system (os error 30)', build.rs:13:22 [INFO] [stderr] stack backtrace: [INFO] [stderr] 0: 0x55d1c375d560 - std::backtrace_rs::backtrace::libunwind::trace::h448c56741b6011d3 [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/../../backtrace/src/backtrace/libunwind.rs:100:5 [INFO] [stderr] 1: 0x55d1c375d560 - std::backtrace_rs::backtrace::trace_unsynchronized::h2d26397c5720fdbb [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 [INFO] [stderr] 2: 0x55d1c375d560 - std::sys_common::backtrace::_print_fmt::h720a2f61f75b9f58 [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/sys_common/backtrace.rs:67:5 [INFO] [stderr] 3: 0x55d1c375d560 - ::fmt::h8d62bbfda6d5c836 [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/sys_common/backtrace.rs:46:22 [INFO] [stderr] 4: 0x55d1c377677c - core::fmt::write::h1857a60b204f1b6a [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/core/src/fmt/mod.rs:1078:17 [INFO] [stderr] 5: 0x55d1c375b9b2 - std::io::Write::write_fmt::h16a9fe7680ac245c [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/io/mod.rs:1519:15 [INFO] [stderr] 6: 0x55d1c375f825 - std::sys_common::backtrace::_print::h9ba51a6db618de7d [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/sys_common/backtrace.rs:49:5 [INFO] [stderr] 7: 0x55d1c375f825 - std::sys_common::backtrace::print::h5f20e41c85e91716 [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/sys_common/backtrace.rs:36:9 [INFO] [stderr] 8: 0x55d1c375f825 - std::panicking::default_hook::{{closure}}::h5b7294ca19e8edab [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/panicking.rs:208:50 [INFO] [stderr] 9: 0x55d1c375f37a - std::panicking::default_hook::hb3948d1f74b6ff4c [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/panicking.rs:225:9 [INFO] [stderr] 10: 0x55d1c375ffc1 - std::panicking::rust_panic_with_hook::h55d23fef0ad751bc [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/panicking.rs:591:17 [INFO] [stderr] 11: 0x55d1c375fb07 - std::panicking::begin_panic_handler::{{closure}}::h56ae74c6dea6e141 [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/panicking.rs:497:13 [INFO] [stderr] 12: 0x55d1c375d9fc - std::sys_common::backtrace::__rust_end_short_backtrace::h3c4721f56689fae4 [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/sys_common/backtrace.rs:141:18 [INFO] [stderr] 13: 0x55d1c375fa69 - rust_begin_unwind [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/panicking.rs:493:5 [INFO] [stderr] 14: 0x55d1c375fa1b - std::panicking::begin_panic_fmt::h447a9fe10c3ac155 [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/panicking.rs:435:5 [INFO] [stderr] 15: 0x55d1c3749084 - build_script_build::main::h8d4e8ae26b0724e2 [INFO] [stderr] at /opt/rustwide/workdir/build.rs:13:22 [INFO] [stderr] 16: 0x55d1c374b44b - core::ops::function::FnOnce::call_once::h05c6e3312a9127a8 [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/core/src/ops/function.rs:227:5 [INFO] [stderr] 17: 0x55d1c374b35e - std::sys_common::backtrace::__rust_begin_short_backtrace::hd399ca0e94aa283f [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/sys_common/backtrace.rs:125:18 [INFO] [stderr] 18: 0x55d1c3748c81 - std::rt::lang_start::{{closure}}::h1b6714d70a59cb86 [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/rt.rs:66:18 [INFO] [stderr] 19: 0x55d1c37603e7 - core::ops::function::impls:: for &F>::call_once::h3f3ba5d1e0ce8d49 [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/core/src/ops/function.rs:259:13 [INFO] [stderr] 20: 0x55d1c37603e7 - std::panicking::try::do_call::hd7a374fc87b951e7 [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/panicking.rs:379:40 [INFO] [stderr] 21: 0x55d1c37603e7 - std::panicking::try::h068087b173f80a49 [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/panicking.rs:343:19 [INFO] [stderr] 22: 0x55d1c37603e7 - std::panic::catch_unwind::h1f8259807e825279 [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/panic.rs:396:14 [INFO] [stderr] 23: 0x55d1c37603e7 - std::rt::lang_start_internal::h8ff82302dd620b52 [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/rt.rs:51:25 [INFO] [stderr] 24: 0x55d1c3748c57 - std::rt::lang_start::h1c549fcb72a63b64 [INFO] [stderr] at /rustc/c919f490bbcd2b29b74016101f7ec71aaa24bdbb/library/std/src/rt.rs:65:5 [INFO] [stderr] 25: 0x55d1c374918a - main [INFO] [stderr] 26: 0x7f1cb832d0b3 - __libc_start_main [INFO] [stderr] 27: 0x55d1c37460ae - _start [INFO] [stderr] 28: 0x0 - [INFO] running `Command { std: "docker" "inspect" "c75b001356aa40abf302681c3b784a57f12278989bd1a9c905dc54c99469c2af", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "c75b001356aa40abf302681c3b784a57f12278989bd1a9c905dc54c99469c2af", kill_on_drop: false }` [INFO] [stdout] c75b001356aa40abf302681c3b784a57f12278989bd1a9c905dc54c99469c2af