Sep 21 11:55:38.788 INFO checking core_rustc-serialize-0.3.20-v0.3.19patch1 against try#f1a3f05968ed2a674e09b6efa4ad9df90816e2b6 for pr-54394
Sep 21 11:55:38.788 INFO running: cargo +f1a3f05968ed2a674e09b6efa4ad9df90816e2b6-alt check --frozen --all --all-targets
Sep 21 11:55:38.788 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-4/pr-54394/try#f1a3f05968ed2a674e09b6efa4ad9df90816e2b6:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54394/worker-4/try#f1a3f05968ed2a674e09b6efa4ad9df90816e2b6:/target:rw,Z" "-v" "/home/ec2-user/crater/./work/local/cargo-home:/cargo-home:ro,Z" "-v" "/home/ec2-user/crater/./work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "CMD=cargo +f1a3f05968ed2a674e09b6efa4ad9df90816e2b6-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "1536M" "crater"`
Sep 21 11:55:38.947 INFO blam! b3fe3bf81aef8e419c660eade6985476af427d6fb0cbc55e965fc973c2e72acd
Sep 21 11:55:38.948 INFO running `"docker" "start" "-a" "b3fe3bf81aef8e419c660eade6985476af427d6fb0cbc55e965fc973c2e72acd"`
Sep 21 11:55:40.031 INFO kablam! usermod: no changes
Sep 21 11:55:40.065 INFO kablam!    Compiling core_collections v0.3.20170409
Sep 21 11:55:40.846 INFO kablam! error: failed to run custom build command for `core_collections v0.3.20170409`
Sep 21 11:55:40.846 INFO kablam! process didn't exit successfully: `/target/debug/build/core_collections-01f5f12f9de4c704/build-script-build` (exit code: 101)
Sep 21 11:55:40.846 INFO kablam! --- stderr
Sep 21 11:55:40.846 INFO kablam! thread 'main' panicked at 'Unknown compiler version, upgrade core_collections?', libcore/option.rs:1010:5
Sep 21 11:55:40.846 INFO kablam! stack backtrace:
Sep 21 11:55:40.846 INFO kablam!    0:     0x55f62cc8a4de - std::sys::unix::backtrace::tracing::imp::unwind_backtrace::h6f03e345e7220f71
Sep 21 11:55:40.846 INFO kablam!                                at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
Sep 21 11:55:40.846 INFO kablam!    1:     0x55f62cc7e686 - std::sys_common::backtrace::print::h41236bee57dc6f2f
Sep 21 11:55:40.846 INFO kablam!                                at libstd/sys_common/backtrace.rs:71
Sep 21 11:55:40.846 INFO kablam!                                at libstd/sys_common/backtrace.rs:59
Sep 21 11:55:40.846 INFO kablam!    2:     0x55f62cc7cfdd - std::panicking::default_hook::{{closure}}::hdccdd5cf822554bd
Sep 21 11:55:40.846 INFO kablam!                                at libstd/panicking.rs:211
Sep 21 11:55:40.846 INFO kablam!    3:     0x55f62cc7cd50 - std::panicking::default_hook::h51e0996e64af4435
Sep 21 11:55:40.847 INFO kablam!                                at libstd/panicking.rs:227
Sep 21 11:55:40.847 INFO kablam!    4:     0x55f62cc7d59c - std::panicking::rust_panic_with_hook::hbba83c9bc00efd25
Sep 21 11:55:40.847 INFO kablam!                                at libstd/panicking.rs:477
Sep 21 11:55:40.847 INFO kablam!    5:     0x55f62cc7d199 - std::panicking::continue_panic_fmt::ha190502cef7433c2
Sep 21 11:55:40.847 INFO kablam!                                at libstd/panicking.rs:391
Sep 21 11:55:40.847 INFO kablam!    6:     0x55f62cc7d095 - rust_begin_unwind
Sep 21 11:55:40.847 INFO kablam!                                at libstd/panicking.rs:326
Sep 21 11:55:40.847 INFO kablam!    7:     0x55f62ccc590b - core::panicking::panic_fmt::h7abbba9d1f088415
Sep 21 11:55:40.847 INFO kablam!                                at libcore/panicking.rs:77
Sep 21 11:55:40.847 INFO kablam!    8:     0x55f62ccc5981 - core::option::expect_failed::ha2dca905a52a978c
Sep 21 11:55:40.847 INFO kablam!                                at libcore/option.rs:1010
Sep 21 11:55:40.847 INFO kablam!    9:     0x55f62cc59413 - <core::option::Option<T>>::expect::hd053e0c585074c71
Sep 21 11:55:40.847 INFO kablam!                                at libcore/option.rs:322
Sep 21 11:55:40.847 INFO kablam!   10:     0x55f62cc575ff - build_script_build::main::he5f16bd3ded391a7
Sep 21 11:55:40.847 INFO kablam!                                at /cargo-home/registry/src/github.com-1ecc6299db9ec823/core_collections-0.3.20170409/build.rs:48
Sep 21 11:55:40.847 INFO kablam!   11:     0x55f62cc58b4f - std::rt::lang_start::{{closure}}::h12ba873fc24e3036
Sep 21 11:55:40.847 INFO kablam!                                at libstd/rt.rs:74
Sep 21 11:55:40.847 INFO kablam!   12:     0x55f62cc7d082 - std::panicking::try::do_call::h5d32e7529efe730f
Sep 21 11:55:40.847 INFO kablam!                                at libstd/rt.rs:59
Sep 21 11:55:40.847 INFO kablam!                                at libstd/panicking.rs:310
Sep 21 11:55:40.847 INFO kablam!   13:     0x55f62cc9b3a9 - __rust_maybe_catch_panic
Sep 21 11:55:40.847 INFO kablam!                                at libpanic_unwind/lib.rs:102
Sep 21 11:55:40.847 INFO kablam!   14:     0x55f62cc870f5 - std::rt::lang_start_internal::hc5e2e4826ae19193
Sep 21 11:55:40.847 INFO kablam!                                at libstd/panicking.rs:289
Sep 21 11:55:40.847 INFO kablam!                                at libstd/panic.rs:392
Sep 21 11:55:40.847 INFO kablam!                                at libstd/rt.rs:58
Sep 21 11:55:40.847 INFO kablam!   15:     0x55f62cc58b27 - std::rt::lang_start::h8584aba2a5132f8c
Sep 21 11:55:40.847 INFO kablam!                                at libstd/rt.rs:74
Sep 21 11:55:40.847 INFO kablam!   16:     0x55f62cc57de9 - main
Sep 21 11:55:40.847 INFO kablam!   17:     0x7fed3c65882f - __libc_start_main
Sep 21 11:55:40.847 INFO kablam!   18:     0x55f62cc513c8 - _start
Sep 21 11:55:40.847 INFO kablam!   19:                0x0 - <unknown>
Sep 21 11:55:40.847 INFO kablam! 
Sep 21 11:55:40.847 INFO kablam! su: No module specific data is present
Sep 21 11:55:42.099 INFO running `"docker" "rm" "-f" "b3fe3bf81aef8e419c660eade6985476af427d6fb0cbc55e965fc973c2e72acd"`
Sep 21 11:55:42.157 INFO blam! b3fe3bf81aef8e419c660eade6985476af427d6fb0cbc55e965fc973c2e72acd