[INFO] crate redox_users 0.2.0 is already in cache
[INFO] extracting crate redox_users 0.2.0 into work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/reg/redox_users/0.2.0
[INFO] extracting crate redox_users 0.2.0 into work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/reg/redox_users/0.2.0
[INFO] validating manifest of redox_users-0.2.0 on toolchain master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of redox_users-0.2.0 on toolchain try#7fea0229842e79db1159ea58ad9a653b288efee9
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing redox_users-0.2.0
[INFO] finished frobbing redox_users-0.2.0
[INFO] frobbed toml for redox_users-0.2.0 written to work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/reg/redox_users/0.2.0/Cargo.toml
[INFO] started frobbing redox_users-0.2.0
[INFO] finished frobbing redox_users-0.2.0
[INFO] frobbed toml for redox_users-0.2.0 written to work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/reg/redox_users/0.2.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing redox_users-0.2.0 against master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54 for pr-57967
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-5/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/reg/redox_users/0.2.0:/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" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "build" "--frozen"`
[INFO] [stdout] 3ddda40837b479947430a0762b2884f247cda5172ad91b34ecc3ffb6c9675905
[INFO] running `"docker" "start" "-a" "3ddda40837b479947430a0762b2884f247cda5172ad91b34ecc3ffb6c9675905"`
[INFO] [stderr]    Compiling redox_syscall v0.1.51
[INFO] [stderr]    Compiling blake2-rfc v0.2.18
[INFO] [stderr]    Compiling argon2rs v0.2.5
[INFO] [stderr]    Compiling redox_users v0.2.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.98s
[INFO] running `"docker" "inspect" "3ddda40837b479947430a0762b2884f247cda5172ad91b34ecc3ffb6c9675905"`
[INFO] running `"docker" "rm" "-f" "3ddda40837b479947430a0762b2884f247cda5172ad91b34ecc3ffb6c9675905"`
[INFO] [stdout] 3ddda40837b479947430a0762b2884f247cda5172ad91b34ecc3ffb6c9675905
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-5/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/reg/redox_users/0.2.0:/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" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "test" "--frozen" "--no-run"`
[INFO] [stdout] ff84b857b50d257dcfac9fc10f46a19640add82ff562bfcdb8851eb050b7aec0
[INFO] running `"docker" "start" "-a" "ff84b857b50d257dcfac9fc10f46a19640add82ff562bfcdb8851eb050b7aec0"`
[INFO] [stderr]    Compiling redox_users v0.2.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.12s
[INFO] running `"docker" "inspect" "ff84b857b50d257dcfac9fc10f46a19640add82ff562bfcdb8851eb050b7aec0"`
[INFO] running `"docker" "rm" "-f" "ff84b857b50d257dcfac9fc10f46a19640add82ff562bfcdb8851eb050b7aec0"`
[INFO] [stdout] ff84b857b50d257dcfac9fc10f46a19640add82ff562bfcdb8851eb050b7aec0
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-5/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/reg/redox_users/0.2.0:/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" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "test" "--frozen"`
[INFO] [stdout] cae90204cba9cb2430f9e50571fc609b3db773e0a185ce8cdc62965fc8b30ff7
[INFO] running `"docker" "start" "-a" "cae90204cba9cb2430f9e50571fc609b3db773e0a185ce8cdc62965fc8b30ff7"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/redox_users-bcfbb2f25143073b
[INFO] [stdout] 
[INFO] [stdout] running 11 tests
[INFO] [stdout] test test::get_group ... ok
[INFO] [stdout] test test::get_user ... ok
[INFO] [stdout] test test::get_unused_ids ... ok
[INFO] [stdout] test test::wrong_attempt_is_password_blank ... ok
[INFO] [stdout] test test::wrong_attempt_set_password ... ok
[INFO] [stdout] test test::wrong_attempt_unset_password ... ok
[INFO] [stdout] test test::wrong_attempt_verify_password ... ok
[INFO] [stdout] test test::wrong_attempt_is_password_unset ... ok
[INFO] [stdout] test test::manip_user ... FAILED
[INFO] [stdout] test test::manip_group ... FAILED
[INFO] [stdout] test test::attempt_user_api ... ok
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- test::manip_user stdout ----
[INFO] [stdout] Reading file: /opt/crater/workdir/tests/passwd
[INFO] [stdout] Reading file: /opt/crater/workdir/tests/shadow
[INFO] [stdout] Reading file: /opt/crater/workdir/tests/passwd
[INFO] [stdout] thread 'test::manip_user' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 30, kind: Other, message: "Read-only file system" }
[INFO] [stdout] 
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0: failure::backtrace::internal::InternalBacktrace::new::h9716bcb0671ee9bf (0x557a6e3cfc42)
[INFO] [stdout]              at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/failure-0.1.5/src/backtrace/internal.rs:44
[INFO] [stdout]    1: failure::backtrace::Backtrace::new::h04dec17a46bd2cdb (0x557a6e3cf0dd)
[INFO] [stdout]              at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/failure-0.1.5/src/backtrace/mod.rs:111
[INFO] [stdout]    2: <failure::error::error_impl::ErrorImpl as core::convert::From<F>>::from::hf8d3fd036a3068f1 (0x557a6e37b905)
[INFO] [stdout]              at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/failure-0.1.5/src/error/error_impl.rs:19
[INFO] [stdout]    3: <failure::error::Error as core::convert::From<F>>::from::h9acc3a2003123e36 (0x557a6e37862e)
[INFO] [stdout]              at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/failure-0.1.5/src/error/mod.rs:36
[INFO] [stdout]    4: redox_users::write_locked_file::he7e30c2ee94dcaf9 (0x557a6e37d495)
[INFO] [stdout]              at src/lib.rs:151
[INFO] [stdout]    5: redox_users::AllUsers::save::he67fb3a8572fe189 (0x557a6e383039)
[INFO] [stdout]              at src/lib.rs:758
[INFO] [stdout]    6: redox_users::test::manip_user::h6b1ed8dcdcf45d87 (0x557a6e372760)
[INFO] [stdout]              at src/lib.rs:1080
[INFO] [stdout]    7: redox_users::test::manip_user::{{closure}}::h74a71a7493b719a4 (0x557a6e372659)
[INFO] [stdout]              at src/lib.rs:1072
[INFO] [stdout]    8: core::ops::function::FnOnce::call_once::h7b25c7c35042ec4b (0x557a6e3909cd)
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libcore/ops/function.rs:231
[INFO] [stdout]    9: {{closure}} (0x557a6e39b85e)
[INFO] [stdout]              at src/libtest/lib.rs:1474
[INFO] [stdout]       call_once<closure,()>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libcore/ops/function.rs:231
[INFO] [stdout]       call_box<(),closure>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/liballoc/boxed.rs:734
[INFO] [stdout]   10: __rust_maybe_catch_panic (0x557a6e4aaa79)
[INFO] [stdout]              at src/libpanic_unwind/lib.rs:92
[INFO] [stdout]   11: try<(),std::panic::AssertUnwindSafe<alloc::boxed::Box<FnBox<()>>>> (0x557a6e3b8ae7)
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panicking.rs:276
[INFO] [stdout]       catch_unwind<std::panic::AssertUnwindSafe<alloc::boxed::Box<FnBox<()>>>,()>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panic.rs:388
[INFO] [stdout]       {{closure}}
[INFO] [stdout]              at src/libtest/lib.rs:1429
[INFO] [stdout]   12: std::sys_common::backtrace::__rust_begin_short_backtrace::h85c77ad9ddf8fba3 (0x557a6e3942a4)
[INFO] [stdout]   13: {{closure}}<closure,()> (0x557a6e394974)
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/thread/mod.rs:469
[INFO] [stdout]       call_once<(),closure>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panic.rs:309
[INFO] [stdout]       do_call<std::panic::AssertUnwindSafe<closure>,()>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panicking.rs:297
[INFO] [stdout]   14: __rust_maybe_catch_panic (0x557a6e4aaa79)
[INFO] [stdout]              at src/libpanic_unwind/lib.rs:92
[INFO] [stdout]   15: try<(),std::panic::AssertUnwindSafe<closure>> (0x557a6e39badc)
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panicking.rs:276
[INFO] [stdout]       catch_unwind<std::panic::AssertUnwindSafe<closure>,()>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panic.rs:388
[INFO] [stdout]       {{closure}}<closure,()>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/thread/mod.rs:468
[INFO] [stdout]       call_box<(),closure>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/liballoc/boxed.rs:734
[INFO] [stdout]   16: call_once<(),()> (0x557a6e4aa22d)
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/liballoc/boxed.rs:744
[INFO] [stdout]       start_thread
[INFO] [stdout]              at src/libstd/sys_common/thread.rs:14
[INFO] [stdout]       thread_start
[INFO] [stdout]              at src/libstd/sys/unix/thread.rs:81
[INFO] [stdout]   17: start_thread (0x7f287ec5c493)
[INFO] [stdout]   18: __clone (0x7f287e787ace)
[INFO] [stdout]   19: <unknown> (0x0)', src/libcore/result.rs:997:5
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x557a6e4a8553 - std::sys::unix::backtrace::tracing::imp::unwind_backtrace::hb587d2734f1dc7c5
[INFO] [stdout]                                at src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:39
[INFO] [stdout]    1:     0x557a6e4a426b - std::sys_common::backtrace::_print::he39717f7cfbd122d
[INFO] [stdout]                                at src/libstd/sys_common/backtrace.rs:70
[INFO] [stdout]    2:     0x557a6e4a7206 - std::panicking::default_hook::{{closure}}::hb7f1ae5149814e5e
[INFO] [stdout]                                at src/libstd/sys_common/backtrace.rs:58
[INFO] [stdout]                                at src/libstd/panicking.rs:200
[INFO] [stdout]    3:     0x557a6e4a6f07 - std::panicking::default_hook::hc2b73d8ffc772b35
[INFO] [stdout]                                at src/libstd/panicking.rs:209
[INFO] [stdout]    4:     0x557a6e4a7910 - std::panicking::rust_panic_with_hook::h625072734a147d22
[INFO] [stdout]                                at src/libstd/panicking.rs:478
[INFO] [stdout]    5:     0x557a6e4a7491 - std::panicking::continue_panic_fmt::h3d3b66f689c3e04e
[INFO] [stdout]                                at src/libstd/panicking.rs:385
[INFO] [stdout]    6:     0x557a6e4a7375 - rust_begin_unwind
[INFO] [stdout]                                at src/libstd/panicking.rs:312
[INFO] [stdout]    7:     0x557a6e4b9d4c - core::panicking::panic_fmt::h3dc182ff7fefc0c0
[INFO] [stdout]                                at src/libcore/panicking.rs:85
[INFO] [stdout]    8:     0x557a6e3764f4 - core::result::unwrap_failed::h56d3ade4fc2efd0d
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libcore/macros.rs:16
[INFO] [stdout]    9:     0x557a6e3758cf - <core::result::Result<T, E>>::unwrap::h0c441d68140ea9b3
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libcore/result.rs:798
[INFO] [stdout]   10:     0x557a6e372787 - redox_users::test::manip_user::h6b1ed8dcdcf45d87
[INFO] [stdout]                                at src/lib.rs:1080
[INFO] [stdout]   11:     0x557a6e372659 - redox_users::test::manip_user::{{closure}}::h74a71a7493b719a4
[INFO] [stdout]                                at src/lib.rs:1072
[INFO] [stdout]   12:     0x557a6e3909cd - core::ops::function::FnOnce::call_once::h7b25c7c35042ec4b
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libcore/ops/function.rs:231
[INFO] [stdout]   13:     0x557a6e39b85e - <F as alloc::boxed::FnBox<A>>::call_box::h6b39ff82621fe3f5
[INFO] [stdout]                                at src/libtest/lib.rs:1474
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libcore/ops/function.rs:231
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/liballoc/boxed.rs:734
[INFO] [stdout]   14:     0x557a6e4aaa79 - __rust_maybe_catch_panic
[INFO] [stdout]                                at src/libpanic_unwind/lib.rs:92
[INFO] [stdout]   15:     0x557a6e3b8ae7 - test::run_test::run_test_inner::{{closure}}::h57942e399d1cc807
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panicking.rs:276
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panic.rs:388
[INFO] [stdout]                                at src/libtest/lib.rs:1429
[INFO] [stdout]   16:     0x557a6e3942a4 - std::sys_common::backtrace::__rust_begin_short_backtrace::h85c77ad9ddf8fba3
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/sys_common/backtrace.rs:135
[INFO] [stdout]   17:     0x557a6e394974 - std::panicking::try::do_call::hf5b2072d080453d1
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/thread/mod.rs:469
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panic.rs:309
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panicking.rs:297
[INFO] [stdout]   18:     0x557a6e4aaa79 - __rust_maybe_catch_panic
[INFO] [stdout]                                at src/libpanic_unwind/lib.rs:92
[INFO] [stdout]   19:     0x557a6e39badc - <F as alloc::boxed::FnBox<A>>::call_box::hf0a5ea81172c4bf3
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panicking.rs:276
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panic.rs:388
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/thread/mod.rs:468
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/liballoc/boxed.rs:734
[INFO] [stdout]   20:     0x557a6e4aa22d - std::sys::unix::thread::Thread::new::thread_start::h60ff5f253b4125d5
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/liballoc/boxed.rs:744
[INFO] [stdout]                                at src/libstd/sys_common/thread.rs:14
[INFO] [stdout]                                at src/libstd/sys/unix/thread.rs:81
[INFO] [stdout]   21:     0x7f287ec5c493 - start_thread
[INFO] [stdout]   22:     0x7f287e787ace - __clone
[INFO] [stdout]   23:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] ---- test::manip_group stdout ----
[INFO] [stdout] Reading file: /opt/crater/workdir/tests/group
[INFO] [stdout] Reading file: /opt/crater/workdir/tests/group
[INFO] [stdout] thread 'test::manip_group' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 30, kind: Other, message: "Read-only file system" }
[INFO] [stdout] 
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0: failure::backtrace::internal::InternalBacktrace::new::h9716bcb0671ee9bf (0x557a6e3cfc42)
[INFO] [stdout]              at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/failure-0.1.5/src/backtrace/internal.rs:44
[INFO] [stdout]    1: failure::backtrace::Backtrace::new::h04dec17a46bd2cdb (0x557a6e3cf0dd)
[INFO] [stdout]              at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/failure-0.1.5/src/backtrace/mod.rs:111
[INFO] [stdout]    2: <failure::error::error_impl::ErrorImpl as core::convert::From<F>>::from::hf8d3fd036a3068f1 (0x557a6e37b905)
[INFO] [stdout]              at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/failure-0.1.5/src/error/error_impl.rs:19
[INFO] [stdout]    3: <failure::error::Error as core::convert::From<F>>::from::h9acc3a2003123e36 (0x557a6e37862e)
[INFO] [stdout]              at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/failure-0.1.5/src/error/mod.rs:36
[INFO] [stdout]    4: redox_users::write_locked_file::he7e30c2ee94dcaf9 (0x557a6e37d495)
[INFO] [stdout]              at src/lib.rs:151
[INFO] [stdout]    5: redox_users::AllGroups::save::ha3405b8c98127524 (0x557a6e3847d3)
[INFO] [stdout]              at src/lib.rs:940
[INFO] [stdout]    6: redox_users::test::manip_group::h0488ed9879eb51a5 (0x557a6e37405b)
[INFO] [stdout]              at src/lib.rs:1159
[INFO] [stdout]    7: redox_users::test::manip_group::{{closure}}::h22d3511c8f740d99 (0x557a6e373f89)
[INFO] [stdout]              at src/lib.rs:1153
[INFO] [stdout]    8: core::ops::function::FnOnce::call_once::h16786f1792e5b959 (0x557a6e3908cd)
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libcore/ops/function.rs:231
[INFO] [stdout]    9: {{closure}} (0x557a6e39b85e)
[INFO] [stdout]              at src/libtest/lib.rs:1474
[INFO] [stdout]       call_once<closure,()>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libcore/ops/function.rs:231
[INFO] [stdout]       call_box<(),closure>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/liballoc/boxed.rs:734
[INFO] [stdout]   10: __rust_maybe_catch_panic (0x557a6e4aaa79)
[INFO] [stdout]              at src/libpanic_unwind/lib.rs:92
[INFO] [stdout]   11: try<(),std::panic::AssertUnwindSafe<alloc::boxed::Box<FnBox<()>>>> (0x557a6e3b8ae7)
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panicking.rs:276
[INFO] [stdout]       catch_unwind<std::panic::AssertUnwindSafe<alloc::boxed::Box<FnBox<()>>>,()>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panic.rs:388
[INFO] [stdout]       {{closure}}
[INFO] [stdout]              at src/libtest/lib.rs:1429
[INFO] [stdout]   12: std::sys_common::backtrace::__rust_begin_short_backtrace::h85c77ad9ddf8fba3 (0x557a6e3942a4)
[INFO] [stdout]   13: {{closure}}<closure,()> (0x557a6e394974)
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/thread/mod.rs:469
[INFO] [stdout]       call_once<(),closure>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panic.rs:309
[INFO] [stdout]       do_call<std::panic::AssertUnwindSafe<closure>,()>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panicking.rs:297
[INFO] [stdout]   14: __rust_maybe_catch_panic (0x557a6e4aaa79)
[INFO] [stdout]              at src/libpanic_unwind/lib.rs:92
[INFO] [stdout]   15: try<(),std::panic::AssertUnwindSafe<closure>> (0x557a6e39badc)
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panicking.rs:276
[INFO] [stdout]       catch_unwind<std::panic::AssertUnwindSafe<closure>,()>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panic.rs:388
[INFO] [stdout]       {{closure}}<closure,()>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/thread/mod.rs:468
[INFO] [stdout]       call_box<(),closure>
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/liballoc/boxed.rs:734
[INFO] [stdout]   16: call_once<(),()> (0x557a6e4aa22d)
[INFO] [stdout]              at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/liballoc/boxed.rs:744
[INFO] [stdout]       start_thread
[INFO] [stdout]              at src/libstd/sys_common/thread.rs:14
[INFO] [stdout]       thread_start
[INFO] [stdout]              at src/libstd/sys/unix/thread.rs:81
[INFO] [stdout]   17: start_thread (0x7f287ec5c493)
[INFO] [stdout]   18: __clone (0x7f287e787ace)
[INFO] [stdout]   19: <unknown> (0x0)', src/libcore/result.rs:997:5
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x557a6e4a8553 - std::sys::unix::backtrace::tracing::imp::unwind_backtrace::hb587d2734f1dc7c5
[INFO] [stdout]                                at src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:39
[INFO] [stdout]    1:     0x557a6e4a426b - std::sys_common::backtrace::_print::he39717f7cfbd122d
[INFO] [stdout]                                at src/libstd/sys_common/backtrace.rs:70
[INFO] [stdout]    2:     0x557a6e4a7206 - std::panicking::default_hook::{{closure}}::hb7f1ae5149814e5e
[INFO] [stdout]                                at src/libstd/sys_common/backtrace.rs:58
[INFO] [stdout]                                at src/libstd/panicking.rs:200
[INFO] [stdout]    3:     0x557a6e4a6f07 - std::panicking::default_hook::hc2b73d8ffc772b35
[INFO] [stdout]                                at src/libstd/panicking.rs:209
[INFO] [stdout]    4:     0x557a6e4a7910 - std::panicking::rust_panic_with_hook::h625072734a147d22
[INFO] [stdout]                                at src/libstd/panicking.rs:478
[INFO] [stdout]    5:     0x557a6e4a7491 - std::panicking::continue_panic_fmt::h3d3b66f689c3e04e
[INFO] [stdout]                                at src/libstd/panicking.rs:385
[INFO] [stdout]    6:     0x557a6e4a7375 - rust_begin_unwind
[INFO] [stdout]                                at src/libstd/panicking.rs:312
[INFO] [stdout]    7:     0x557a6e4b9d4c - core::panicking::panic_fmt::h3dc182ff7fefc0c0
[INFO] [stdout]                                at src/libcore/panicking.rs:85
[INFO] [stdout]    8:     0x557a6e3764f4 - core::result::unwrap_failed::h56d3ade4fc2efd0d
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libcore/macros.rs:16
[INFO] [stdout]    9:     0x557a6e3758cf - <core::result::Result<T, E>>::unwrap::h0c441d68140ea9b3
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libcore/result.rs:798
[INFO] [stdout]   10:     0x557a6e374082 - redox_users::test::manip_group::h0488ed9879eb51a5
[INFO] [stdout]                                at src/lib.rs:1159
[INFO] [stdout]   11:     0x557a6e373f89 - redox_users::test::manip_group::{{closure}}::h22d3511c8f740d99
[INFO] [stdout]                                at src/lib.rs:1153
[INFO] [stdout]   12:     0x557a6e3908cd - core::ops::function::FnOnce::call_once::h16786f1792e5b959
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libcore/ops/function.rs:231
[INFO] [stdout]   13:     0x557a6e39b85e - <F as alloc::boxed::FnBox<A>>::call_box::h6b39ff82621fe3f5
[INFO] [stdout]                                at src/libtest/lib.rs:1474
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libcore/ops/function.rs:231
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/liballoc/boxed.rs:734
[INFO] [stdout]   14:     0x557a6e4aaa79 - __rust_maybe_catch_panic
[INFO] [stdout]                                at src/libpanic_unwind/lib.rs:92
[INFO] [stdout]   15:     0x557a6e3b8ae7 - test::run_test::run_test_inner::{{closure}}::h57942e399d1cc807
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panicking.rs:276
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panic.rs:388
[INFO] [stdout]                                at src/libtest/lib.rs:1429
[INFO] [stdout]   16:     0x557a6e3942a4 - std::sys_common::backtrace::__rust_begin_short_backtrace::h85c77ad9ddf8fba3
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/sys_common/backtrace.rs:135
[INFO] [stdout]   17:     0x557a6e394974 - std::panicking::try::do_call::hf5b2072d080453d1
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/thread/mod.rs:469
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panic.rs:309
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panicking.rs:297
[INFO] [stdout]   18:     0x557a6e4aaa79 - __rust_maybe_catch_panic
[INFO] [stdout]                                at src/libpanic_unwind/lib.rs:92
[INFO] [stdout]   19:     0x557a6e39badc - <F as alloc::boxed::FnBox<A>>::call_box::hf0a5ea81172c4bf3
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panicking.rs:276
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/panic.rs:388
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/libstd/thread/mod.rs:468
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/liballoc/boxed.rs:734
[INFO] [stdout]   20:     0x557a6e4aa22d - std::sys::unix::thread::Thread::new::thread_start::h60ff5f253b4125d5
[INFO] [stdout]                                at /rustc/c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/src/liballoc/boxed.rs:744
[INFO] [stdout]                                at src/libstd/sys_common/thread.rs:14
[INFO] [stdout]                                at src/libstd/sys/unix/thread.rs:81
[INFO] [stdout]   21:     0x7f287ec5c493 - start_thread
[INFO] [stdout]   22:     0x7f287e787ace - __clone
[INFO] [stdout]   23:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     test::manip_group
[INFO] [stdout]     test::manip_user
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 9 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--lib'
[INFO] running `"docker" "inspect" "cae90204cba9cb2430f9e50571fc609b3db773e0a185ce8cdc62965fc8b30ff7"`
[INFO] running `"docker" "rm" "-f" "cae90204cba9cb2430f9e50571fc609b3db773e0a185ce8cdc62965fc8b30ff7"`
[INFO] [stdout] cae90204cba9cb2430f9e50571fc609b3db773e0a185ce8cdc62965fc8b30ff7