[INFO] crate r-rust 0.0.10 is already in cache
[INFO] extracting crate r-rust 0.0.10 into work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/reg/r-rust/0.0.10
[INFO] extracting crate r-rust 0.0.10 into work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/reg/r-rust/0.0.10
[INFO] validating manifest of r-rust-0.0.10 on toolchain master#435236b8877cdb98c82eaebfb7887782277265c5
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of r-rust-0.0.10 on toolchain try#b5c7f157c20453dde8d47371abe73b32351b4e7f
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing r-rust-0.0.10
[INFO] finished frobbing r-rust-0.0.10
[INFO] frobbed toml for r-rust-0.0.10 written to work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/reg/r-rust/0.0.10/Cargo.toml
[INFO] started frobbing r-rust-0.0.10
[INFO] finished frobbing r-rust-0.0.10
[INFO] frobbed toml for r-rust-0.0.10 written to work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/reg/r-rust/0.0.10/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking r-rust-0.0.10 against try#b5c7f157c20453dde8d47371abe73b32351b4e7f for pr-62849
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62849/worker-0/try#b5c7f157c20453dde8d47371abe73b32351b4e7f:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/reg/r-rust/0.0.10:/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=forbid" "-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" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 51467f58d37c90e1a10f7ff929b896f5bfd29aeb50b3894b7c12f1d6ecc6bd10
[INFO] running `"docker" "start" "-a" "51467f58d37c90e1a10f7ff929b896f5bfd29aeb50b3894b7c12f1d6ecc6bd10"`
[INFO] [stderr]    Compiling toml v0.5.1
[INFO] [stderr]    Compiling r-rust v0.0.10 (/opt/crater/workdir)
[INFO] [stderr] error: failed to run custom build command for `r-rust v0.0.10 (/opt/crater/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/crater/target/debug/build/r-rust-45c86dde2c33483d/build-script-build` (exit code: 101)
[INFO] [stderr] --- stdout
[INFO] [stderr] cargo:rerun-if-env-changed=SYSTEM_CPU_COUNT
[INFO] [stderr] 
[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:1084:5
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x55bcc33af35b - backtrace::backtrace::libunwind::trace::h80786597adfabf72
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.34/src/backtrace/libunwind.rs:88
[INFO] [stderr]    1:     0x55bcc33af35b - backtrace::backtrace::trace_unsynchronized::hcac650387ca20819
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.34/src/backtrace/mod.rs:66
[INFO] [stderr]    2:     0x55bcc33af35b - std::sys_common::backtrace::_print::h1b9354ff68cb5a2b
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:47
[INFO] [stderr]    3:     0x55bcc33af35b - std::sys_common::backtrace::print::hee32569be499cf66
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:36
[INFO] [stderr]    4:     0x55bcc33af35b - std::panicking::default_hook::{{closure}}::h57d4a5a18212e6c4
[INFO] [stderr]                                at src/libstd/panicking.rs:200
[INFO] [stderr]    5:     0x55bcc33af036 - std::panicking::default_hook::h6b5ac8e0c8ee81de
[INFO] [stderr]                                at src/libstd/panicking.rs:214
[INFO] [stderr]    6:     0x55bcc33afa1d - std::panicking::rust_panic_with_hook::h087293a0d0382d86
[INFO] [stderr]                                at src/libstd/panicking.rs:477
[INFO] [stderr]    7:     0x55bcc33af5a2 - std::panicking::continue_panic_fmt::h5398c0b14056de59
[INFO] [stderr]                                at src/libstd/panicking.rs:384
[INFO] [stderr]    8:     0x55bcc33af486 - rust_begin_unwind
[INFO] [stderr]                                at src/libstd/panicking.rs:311
[INFO] [stderr]    9:     0x55bcc33c8e1d - core::panicking::panic_fmt::hc22ef80bd93ddcf4
[INFO] [stderr]                                at src/libcore/panicking.rs:85
[INFO] [stderr]   10:     0x55bcc33c8f17 - core::result::unwrap_failed::h52618310aa6d47ad
[INFO] [stderr]                                at src/libcore/result.rs:1084
[INFO] [stderr]   11:     0x55bcc332fb40 - core::result::Result<T,E>::unwrap::hd29f8cc6c21a7875
[INFO] [stderr]                                at /rustc/b5c7f157c20453dde8d47371abe73b32351b4e7f/src/libcore/result.rs:852
[INFO] [stderr]   12:     0x55bcc332a584 - build_script_build::cpu_count::h39cfaf1e4f63c3d9
[INFO] [stderr]                                at /opt/crater/workdir/build.rs:15
[INFO] [stderr]   13:     0x55bcc332ea4b - build_script_build::main::h346f714888181e4a
[INFO] [stderr]                                at /opt/crater/workdir/build.rs:186
[INFO] [stderr]   14:     0x55bcc3334140 - std::rt::lang_start::{{closure}}::hea064411de7775c9
[INFO] [stderr]                                at /rustc/b5c7f157c20453dde8d47371abe73b32351b4e7f/src/libstd/rt.rs:64
[INFO] [stderr]   15:     0x55bcc33af473 - std::rt::lang_start_internal::{{closure}}::h1a060554ddace6f7
[INFO] [stderr]                                at src/libstd/rt.rs:49
[INFO] [stderr]   16:     0x55bcc33af473 - std::panicking::try::do_call::h36cfd8d9c1d0d936
[INFO] [stderr]                                at src/libstd/panicking.rs:296
[INFO] [stderr]   17:     0x55bcc33b18fa - __rust_maybe_catch_panic
[INFO] [stderr]                                at src/libpanic_unwind/lib.rs:80
[INFO] [stderr]   18:     0x55bcc33aff2d - std::panicking::try::h225224763b892cde
[INFO] [stderr]                                at src/libstd/panicking.rs:275
[INFO] [stderr]   19:     0x55bcc33aff2d - std::panic::catch_unwind::h3043ed737cbd6e8e
[INFO] [stderr]                                at src/libstd/panic.rs:394
[INFO] [stderr]   20:     0x55bcc33aff2d - std::rt::lang_start_internal::h97b8d999a39debed
[INFO] [stderr]                                at src/libstd/rt.rs:48
[INFO] [stderr]   21:     0x55bcc3334119 - std::rt::lang_start::hdef227befad4a74f
[INFO] [stderr]                                at /rustc/b5c7f157c20453dde8d47371abe73b32351b4e7f/src/libstd/rt.rs:64
[INFO] [stderr]   22:     0x55bcc332eaea - main
[INFO] [stderr]   23:     0x7f9c4edb32e1 - __libc_start_main
[INFO] [stderr]   24:     0x55bcc332a29a - _start
[INFO] [stderr]   25:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] running `"docker" "inspect" "51467f58d37c90e1a10f7ff929b896f5bfd29aeb50b3894b7c12f1d6ecc6bd10"`
[INFO] running `"docker" "rm" "-f" "51467f58d37c90e1a10f7ff929b896f5bfd29aeb50b3894b7c12f1d6ecc6bd10"`
[INFO] [stdout] 51467f58d37c90e1a10f7ff929b896f5bfd29aeb50b3894b7c12f1d6ecc6bd10