[INFO] cloning repository https://github.com/JScearcy/Rust-Koans
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JScearcy/Rust-Koans" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJScearcy%2FRust-Koans", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJScearcy%2FRust-Koans'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cb4bceeb057657f833916c019f96605c7170382c
[INFO] checking JScearcy/Rust-Koans against try#8de4b308b608cded0ebccf658a0fc719bce87d4e for pr-89056
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJScearcy%2FRust-Koans" "/workspace/builds/worker-33/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-33/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/JScearcy/Rust-Koans on toolchain 8de4b308b608cded0ebccf658a0fc719bce87d4e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/JScearcy/Rust-Koans
[INFO] finished tweaking git repo https://github.com/JScearcy/Rust-Koans
[INFO] tweaked toml for git repo https://github.com/JScearcy/Rust-Koans written to /workspace/builds/worker-33/source/Cargo.toml
[INFO] crate git repo https://github.com/JScearcy/Rust-Koans already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 139a9c2ac87582a0a7a824cc1374fbf19f874fcb5315173168ee08ca8d7b0208
[INFO] running `Command { std: "docker" "start" "-a" "139a9c2ac87582a0a7a824cc1374fbf19f874fcb5315173168ee08ca8d7b0208", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "139a9c2ac87582a0a7a824cc1374fbf19f874fcb5315173168ee08ca8d7b0208", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "139a9c2ac87582a0a7a824cc1374fbf19f874fcb5315173168ee08ca8d7b0208", kill_on_drop: false }`
[INFO] [stdout] 139a9c2ac87582a0a7a824cc1374fbf19f874fcb5315173168ee08ca8d7b0208
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eb5bc8752ae48f242fabab34c84e08715dd022e3db3a581b7fb3da3d9b656d03
[INFO] running `Command { std: "docker" "start" "-a" "eb5bc8752ae48f242fabab34c84e08715dd022e3db3a581b7fb3da3d9b656d03", kill_on_drop: false }`
[INFO] [stderr]    Compiling koans v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr] error: failed to run custom build command for `koans v0.2.0 (/opt/rustwide/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/koans-fe0eb64126fd436a/build-script-build` (exit status: 101)
[INFO] [stderr]   --- stderr
[INFO] [stderr]   thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 30, kind: ReadOnlyFilesystem, message: "Read-only file system" }', build.rs:7:10
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x562477417e6c - std::backtrace_rs::backtrace::libunwind::trace::h2ab374bc2a3b7023
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
[INFO] [stderr]      1:     0x562477417e6c - std::backtrace_rs::backtrace::trace_unsynchronized::h128cb5178b04dc46
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x562477417e6c - std::sys_common::backtrace::_print_fmt::h5344f9eefca2041f
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/sys_common/backtrace.rs:67:5
[INFO] [stderr]      3:     0x562477417e6c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h213003bc5c7acf04
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/sys_common/backtrace.rs:46:22
[INFO] [stderr]      4:     0x5624774326ac - core::fmt::write::h78bf85fc3e93663f
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/core/src/fmt/mod.rs:1126:17
[INFO] [stderr]      5:     0x562477415ee5 - std::io::Write::write_fmt::he619515c888f21a5
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/io/mod.rs:1667:15
[INFO] [stderr]      6:     0x562477419560 - std::sys_common::backtrace::_print::hf706674f77848203
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/sys_common/backtrace.rs:49:5
[INFO] [stderr]      7:     0x562477419560 - std::sys_common::backtrace::print::hf0b6c7a88804ec56
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/sys_common/backtrace.rs:36:9
[INFO] [stderr]      8:     0x562477419560 - std::panicking::default_hook::{{closure}}::h2dde766cd83a333a
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/panicking.rs:210:50
[INFO] [stderr]      9:     0x562477419117 - std::panicking::default_hook::h501e3b2e134eb149
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/panicking.rs:227:9
[INFO] [stderr]     10:     0x562477419c14 - std::panicking::rust_panic_with_hook::hc09e869c4cf00885
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/panicking.rs:624:17
[INFO] [stderr]     11:     0x5624774196f0 - std::panicking::begin_panic_handler::{{closure}}::hc2c6d70142458fc8
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/panicking.rs:521:13
[INFO] [stderr]     12:     0x562477418314 - std::sys_common::backtrace::__rust_end_short_backtrace::had58f7c459a1cd6e
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/sys_common/backtrace.rs:141:18
[INFO] [stderr]     13:     0x562477419659 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/panicking.rs:517:5
[INFO] [stderr]     14:     0x562477402d71 - core::panicking::panic_fmt::hf443e5eeb6cc9eab
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/core/src/panicking.rs:103:14
[INFO] [stderr]     15:     0x562477402e03 - core::result::unwrap_failed::h885d3f7beb571353
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/core/src/result.rs:1617:5
[INFO] [stderr]     16:     0x562477403f6d - core::result::Result<T,E>::unwrap::h2a9772ea4b581485
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/core/src/result.rs:1299:23
[INFO] [stderr]     17:     0x562477403b91 - build_script_build::main::h2f5ac727288e807f
[INFO] [stderr]                                  at /opt/rustwide/workdir/build.rs:4:5
[INFO] [stderr]     18:     0x562477403cbb - core::ops::function::FnOnce::call_once::h2e51e1efe9cbcd4f
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/core/src/ops/function.rs:227:5
[INFO] [stderr]     19:     0x562477403a7e - std::sys_common::backtrace::__rust_begin_short_backtrace::h4d5e1317242dbd08
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/sys_common/backtrace.rs:125:18
[INFO] [stderr]     20:     0x562477403e91 - std::rt::lang_start::{{closure}}::hfe60495717dcf152
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/rt.rs:64:18
[INFO] [stderr]     21:     0x56247741a11a - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::hab43eb8ec758341e
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/core/src/ops/function.rs:259:13
[INFO] [stderr]     22:     0x56247741a11a - std::panicking::try::do_call::hb667fefd650e964d
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/panicking.rs:403:40
[INFO] [stderr]     23:     0x56247741a11a - std::panicking::try::hc279775c9409768d
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/panicking.rs:367:19
[INFO] [stderr]     24:     0x56247741a11a - std::panic::catch_unwind::hbe8b6ecc84f73073
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/panic.rs:133:14
[INFO] [stderr]     25:     0x56247741a11a - std::rt::lang_start_internal::{{closure}}::hb04fdaef496a162b
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/rt.rs:46:48
[INFO] [stderr]     26:     0x56247741a11a - std::panicking::try::do_call::habca359de051411d
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/panicking.rs:403:40
[INFO] [stderr]     27:     0x56247741a11a - std::panicking::try::h24c556a6948e0937
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/panicking.rs:367:19
[INFO] [stderr]     28:     0x56247741a11a - std::panic::catch_unwind::h58075d47f5a308d8
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/panic.rs:133:14
[INFO] [stderr]     29:     0x56247741a11a - std::rt::lang_start_internal::h3d20dc1537d76758
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/rt.rs:46:20
[INFO] [stderr]     30:     0x562477403e60 - std::rt::lang_start::h972e04c51f46f5c2
[INFO] [stderr]                                  at /rustc/8de4b308b608cded0ebccf658a0fc719bce87d4e/library/std/src/rt.rs:63:17
[INFO] [stderr]     31:     0x562477403bcc - main
[INFO] [stderr]     32:     0x7f3552d1c0b3 - __libc_start_main
[INFO] [stderr]     33:     0x5624774034ce - _start
[INFO] [stderr]     34:                0x0 - <unknown>
[INFO] running `Command { std: "docker" "inspect" "eb5bc8752ae48f242fabab34c84e08715dd022e3db3a581b7fb3da3d9b656d03", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb5bc8752ae48f242fabab34c84e08715dd022e3db3a581b7fb3da3d9b656d03", kill_on_drop: false }`
[INFO] [stdout] eb5bc8752ae48f242fabab34c84e08715dd022e3db3a581b7fb3da3d9b656d03