[INFO] updating cached repository https://github.com/crazymykl/rust-koans [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] e427bb720403f90dece0e298c50d536ed2fe4f6c [INFO] testing crazymykl/rust-koans against try#41997647ba6a77908f6ef64401414feb00bccf16 for pr-71274 [INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcrazymykl%2Frust-koans" "/workspace/builds/worker-12/source"` [INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/crazymykl/rust-koans on toolchain 41997647ba6a77908f6ef64401414feb00bccf16 [INFO] running `"/workspace/cargo-home/bin/cargo" "+41997647ba6a77908f6ef64401414feb00bccf16" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started tweaking git repo https://github.com/crazymykl/rust-koans [INFO] finished tweaking git repo https://github.com/crazymykl/rust-koans [INFO] tweaked toml for git repo https://github.com/crazymykl/rust-koans written to /workspace/builds/worker-12/source/Cargo.toml [INFO] crate git repo https://github.com/crazymykl/rust-koans already has a lockfile, it will not be regenerated [INFO] running `"/workspace/cargo-home/bin/cargo" "+41997647ba6a77908f6ef64401414feb00bccf16" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+41997647ba6a77908f6ef64401414feb00bccf16" "build" "--frozen"` [INFO] [stdout] 031d1c76be198e897e911c482494ccb568e8b9311f3995077547dc3da17e265e [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `"docker" "start" "-a" "031d1c76be198e897e911c482494ccb568e8b9311f3995077547dc3da17e265e"` [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-325cd3d32086c298/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: 0x55b9df297b74 - backtrace::backtrace::libunwind::trace::h61666fa4b9834a45 [INFO] [stderr] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/libunwind.rs:86 [INFO] [stderr] 1: 0x55b9df297b74 - backtrace::backtrace::trace_unsynchronized::h01d3725fb5da8653 [INFO] [stderr] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/mod.rs:66 [INFO] [stderr] 2: 0x55b9df297b74 - std::sys_common::backtrace::_print_fmt::h5c7c4751bc296f90 [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:78 [INFO] [stderr] 3: 0x55b9df297b74 - ::fmt::h7729313ad2d729c7 [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:59 [INFO] [stderr] 4: 0x55b9df2b597c - core::fmt::write::hb0049f6c12bdaffc [INFO] [stderr] at src/libcore/fmt/mod.rs:1069 [INFO] [stderr] 5: 0x55b9df2963a3 - std::io::Write::write_fmt::hfb486fa6ccb90f14 [INFO] [stderr] at src/libstd/io/mod.rs:1504 [INFO] [stderr] 6: 0x55b9df29a115 - std::sys_common::backtrace::_print::ha087cac92e84a414 [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:62 [INFO] [stderr] 7: 0x55b9df29a115 - std::sys_common::backtrace::print::h6b013d3bfe6cbcb8 [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:49 [INFO] [stderr] 8: 0x55b9df29a115 - std::panicking::default_hook::{{closure}}::h016d7de02def2736 [INFO] [stderr] at src/libstd/panicking.rs:198 [INFO] [stderr] 9: 0x55b9df299e52 - std::panicking::default_hook::h9386f7e484840463 [INFO] [stderr] at src/libstd/panicking.rs:218 [INFO] [stderr] 10: 0x55b9df29a722 - std::panicking::rust_panic_with_hook::h3846eb1b2e5a9312 [INFO] [stderr] at src/libstd/panicking.rs:511 [INFO] [stderr] 11: 0x55b9df29a30b - rust_begin_unwind [INFO] [stderr] at src/libstd/panicking.rs:419 [INFO] [stderr] 12: 0x55b9df29a27b - std::panicking::begin_panic_fmt::h2fa40d03719daab1 [INFO] [stderr] at src/libstd/panicking.rs:373 [INFO] [stderr] 13: 0x55b9df28f746 - build_script_build::main::h170e5e70744268a2 [INFO] [stderr] at /opt/rustwide/workdir/build.rs:13 [INFO] [stderr] 14: 0x55b9df28f98b - std::rt::lang_start::{{closure}}::hb8d233ead9802207 [INFO] [stderr] at /rustc/41997647ba6a77908f6ef64401414feb00bccf16/src/libstd/rt.rs:67 [INFO] [stderr] 15: 0x55b9df29ab68 - std::rt::lang_start_internal::{{closure}}::h76043ceda1ce1596 [INFO] [stderr] at src/libstd/rt.rs:52 [INFO] [stderr] 16: 0x55b9df29ab68 - std::panicking::try::do_call::hb3d81a78fdf1ed63 [INFO] [stderr] at src/libstd/panicking.rs:331 [INFO] [stderr] 17: 0x55b9df29ab68 - std::panicking::try::he8d7c35962fb5d7e [INFO] [stderr] at src/libstd/panicking.rs:274 [INFO] [stderr] 18: 0x55b9df29ab68 - std::panic::catch_unwind::h643ad9bfe058a347 [INFO] [stderr] at src/libstd/panic.rs:394 [INFO] [stderr] 19: 0x55b9df29ab68 - std::rt::lang_start_internal::h4b0f023744ce345f [INFO] [stderr] at src/libstd/rt.rs:51 [INFO] [stderr] 20: 0x55b9df28f967 - std::rt::lang_start::h4be198075c3137d7 [INFO] [stderr] at /rustc/41997647ba6a77908f6ef64401414feb00bccf16/src/libstd/rt.rs:67 [INFO] [stderr] 21: 0x55b9df28f81a - main [INFO] [stderr] 22: 0x7f51cd6cfb97 - __libc_start_main [INFO] [stderr] 23: 0x55b9df28c84a - _start [INFO] [stderr] 24: 0x0 - [INFO] [stderr] [INFO] running `"docker" "inspect" "031d1c76be198e897e911c482494ccb568e8b9311f3995077547dc3da17e265e"` [INFO] running `"docker" "rm" "-f" "031d1c76be198e897e911c482494ccb568e8b9311f3995077547dc3da17e265e"` [INFO] [stdout] 031d1c76be198e897e911c482494ccb568e8b9311f3995077547dc3da17e265e