[INFO] updating cached repository alexclear/rust-koans-answers [INFO] running `"git" "fetch" "--all"` [INFO] [stdout] Fetching origin [INFO] [stderr] From git://github.com/alexclear/rust-koans-answers [INFO] [stderr] * branch HEAD -> FETCH_HEAD [INFO] running `"git" "clone" "work/cache/sources/gh/alexclear/rust-koans-answers" "work/ex/beta-1.37-6/sources/1.36.0/gh/alexclear/rust-koans-answers"` [INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/alexclear/rust-koans-answers'... [INFO] [stderr] done. [INFO] running `"git" "clone" "work/cache/sources/gh/alexclear/rust-koans-answers" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/alexclear/rust-koans-answers"` [INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/alexclear/rust-koans-answers'... [INFO] [stderr] done. [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] 89e124c056c315e10c6d5ab8548902c0cfc64be5 [INFO] sha for GitHub repo alexclear/rust-koans-answers: 89e124c056c315e10c6d5ab8548902c0cfc64be5 [INFO] validating manifest of alexclear/rust-koans-answers on toolchain 1.36.0 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] validating manifest of alexclear/rust-koans-answers on toolchain beta-2019-07-23 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started frobbing alexclear/rust-koans-answers [INFO] finished frobbing alexclear/rust-koans-answers [INFO] frobbed toml for alexclear/rust-koans-answers written to work/ex/beta-1.37-6/sources/1.36.0/gh/alexclear/rust-koans-answers/Cargo.toml [INFO] started frobbing alexclear/rust-koans-answers [INFO] finished frobbing alexclear/rust-koans-answers [INFO] frobbed toml for alexclear/rust-koans-answers written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/alexclear/rust-koans-answers/Cargo.toml [INFO] crate alexclear/rust-koans-answers already has a lockfile, it will not be regenerated [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] testing alexclear/rust-koans-answers against 1.36.0 for beta-1.37-6 [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/alexclear/rust-koans-answers:/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=warn" "-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" "+1.36.0" "build" "--frozen"` [INFO] [stdout] d5c87b5f070b4e2c992685eee993bf9ed4921d6b486ebbce9316a18a0e53eee2 [INFO] running `"docker" "start" "-a" "d5c87b5f070b4e2c992685eee993bf9ed4921d6b486ebbce9316a18a0e53eee2"` [INFO] [stderr] Compiling koans v0.2.0 (/opt/crater/workdir) [INFO] [stderr] error: failed to run custom build command for `koans v0.2.0 (/opt/crater/workdir)` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] process didn't exit successfully: `/opt/crater/target/debug/build/koans-452d745fdf161619/build-script-build` (exit code: 101) [INFO] [stderr] --- stderr [INFO] [stderr] thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 30, kind: Other, message: "Read-only file system" }', src/libcore/result.rs:999:5 [INFO] [stderr] stack backtrace: [INFO] [stderr] 0: 0x55d2a88f60a3 - std::sys::unix::backtrace::tracing::imp::unwind_backtrace::h6485381528590a55 [INFO] [stderr] at src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:39 [INFO] [stderr] 1: 0x55d2a88f1d4b - std::sys_common::backtrace::_print::h49a82ae9552e35c7 [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:71 [INFO] [stderr] 2: 0x55d2a88f4f36 - std::panicking::default_hook::{{closure}}::he20974adbefcc046 [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:59 [INFO] [stderr] at src/libstd/panicking.rs:197 [INFO] [stderr] 3: 0x55d2a88f4cc9 - std::panicking::default_hook::he4af6af4ac7fef7b [INFO] [stderr] at src/libstd/panicking.rs:211 [INFO] [stderr] 4: 0x55d2a88f558f - std::panicking::rust_panic_with_hook::h057ff03eb4c8000f [INFO] [stderr] at src/libstd/panicking.rs:474 [INFO] [stderr] 5: 0x55d2a88f5111 - std::panicking::continue_panic_fmt::ha6d6ae144369025b [INFO] [stderr] at src/libstd/panicking.rs:381 [INFO] [stderr] 6: 0x55d2a88f4ff5 - rust_begin_unwind [INFO] [stderr] at src/libstd/panicking.rs:308 [INFO] [stderr] 7: 0x55d2a89055ac - core::panicking::panic_fmt::hc4f83bfed80aeabd [INFO] [stderr] at src/libcore/panicking.rs:85 [INFO] [stderr] 8: 0x55d2a88ec4ee - core::result::unwrap_failed::h233fd6446bd36610 [INFO] [stderr] at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c/src/libcore/macros.rs:18 [INFO] [stderr] 9: 0x55d2a88ec596 - core::result::Result::unwrap::h8355b10c9cbefd5a [INFO] [stderr] at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c/src/libcore/result.rs:800 [INFO] [stderr] 10: 0x55d2a88ec810 - build_script_build::main::h118dc452624dff67 [INFO] [stderr] at /opt/crater/workdir/build.rs:4 [INFO] [stderr] 11: 0x55d2a88ec6ff - std::rt::lang_start::{{closure}}::h79f597a4d44adbd3 [INFO] [stderr] at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c/src/libstd/rt.rs:64 [INFO] [stderr] 12: 0x55d2a88f4fe2 - std::panicking::try::do_call::hc3d8373a0b215f51 [INFO] [stderr] at src/libstd/rt.rs:49 [INFO] [stderr] at src/libstd/panicking.rs:293 [INFO] [stderr] 13: 0x55d2a88f7189 - __rust_maybe_catch_panic [INFO] [stderr] at src/libpanic_unwind/lib.rs:85 [INFO] [stderr] 14: 0x55d2a88f5a9c - std::rt::lang_start_internal::he5218c8b95d395f2 [INFO] [stderr] at src/libstd/panicking.rs:272 [INFO] [stderr] at src/libstd/panic.rs:394 [INFO] [stderr] at src/libstd/rt.rs:48 [INFO] [stderr] 15: 0x55d2a88ec6d8 - std::rt::lang_start::hf35e802fc886e89f [INFO] [stderr] at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c/src/libstd/rt.rs:64 [INFO] [stderr] 16: 0x55d2a88ec859 - main [INFO] [stderr] 17: 0x7f4b4ae572e0 - __libc_start_main [INFO] [stderr] 18: 0x55d2a88ebeb9 - _start [INFO] [stderr] 19: 0x0 - [INFO] [stderr] [INFO] running `"docker" "inspect" "d5c87b5f070b4e2c992685eee993bf9ed4921d6b486ebbce9316a18a0e53eee2"` [INFO] running `"docker" "rm" "-f" "d5c87b5f070b4e2c992685eee993bf9ed4921d6b486ebbce9316a18a0e53eee2"` [INFO] [stdout] d5c87b5f070b4e2c992685eee993bf9ed4921d6b486ebbce9316a18a0e53eee2