[INFO] crate core_rustc-serialize 0.3.20-v0.3.19patch1 is already in cache
[INFO] testing core_rustc-serialize-0.3.20-v0.3.19patch1 against try#41997647ba6a77908f6ef64401414feb00bccf16 for pr-71274
[INFO] extracting crate core_rustc-serialize 0.3.20-v0.3.19patch1 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate core_rustc-serialize 0.3.20-v0.3.19patch1 on toolchain 41997647ba6a77908f6ef64401414feb00bccf16
[INFO] running `"/workspace/cargo-home/bin/cargo" "+41997647ba6a77908f6ef64401414feb00bccf16" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate core_rustc-serialize 0.3.20-v0.3.19patch1
[INFO] finished tweaking crates.io crate core_rustc-serialize 0.3.20-v0.3.19patch1
[INFO] tweaked toml for crates.io crate core_rustc-serialize 0.3.20-v0.3.19patch1 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+41997647ba6a77908f6ef64401414feb00bccf16" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+41997647ba6a77908f6ef64401414feb00bccf16" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+41997647ba6a77908f6ef64401414feb00bccf16" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7aa2cd89dff04fa64513fe1ae8f284044181bc58a1675c3284cb29298eb50e09
[INFO] running `"docker" "start" "-a" "7aa2cd89dff04fa64513fe1ae8f284044181bc58a1675c3284cb29298eb50e09"`
[INFO] [stderr]    Compiling core_collections v0.3.20170409
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr] error: failed to run custom build command for `core_collections v0.3.20170409`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/core_collections-ebf96b0d812516be/build-script-build` (exit code: 101)
[INFO] [stderr] --- stderr
[INFO] [stderr] thread 'main' panicked at 'Unknown compiler version, upgrade core_collections?', /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/core_collections-0.3.20170409/build.rs:48:13
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x55de9da68654 - backtrace::backtrace::libunwind::trace::h61666fa4b9834a45
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/libunwind.rs:86
[INFO] [stderr]    1:     0x55de9da68654 - backtrace::backtrace::trace_unsynchronized::h01d3725fb5da8653
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/mod.rs:66
[INFO] [stderr]    2:     0x55de9da68654 - std::sys_common::backtrace::_print_fmt::h5c7c4751bc296f90
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:78
[INFO] [stderr]    3:     0x55de9da68654 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h7729313ad2d729c7
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:59
[INFO] [stderr]    4:     0x55de9da8af1c - core::fmt::write::hb0049f6c12bdaffc
[INFO] [stderr]                                at src/libcore/fmt/mod.rs:1069
[INFO] [stderr]    5:     0x55de9da65e33 - std::io::Write::write_fmt::hfb486fa6ccb90f14
[INFO] [stderr]                                at src/libstd/io/mod.rs:1504
[INFO] [stderr]    6:     0x55de9da6ac15 - std::sys_common::backtrace::_print::ha087cac92e84a414
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:62
[INFO] [stderr]    7:     0x55de9da6ac15 - std::sys_common::backtrace::print::h6b013d3bfe6cbcb8
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:49
[INFO] [stderr]    8:     0x55de9da6ac15 - std::panicking::default_hook::{{closure}}::h016d7de02def2736
[INFO] [stderr]                                at src/libstd/panicking.rs:198
[INFO] [stderr]    9:     0x55de9da6a952 - std::panicking::default_hook::h9386f7e484840463
[INFO] [stderr]                                at src/libstd/panicking.rs:218
[INFO] [stderr]   10:     0x55de9da6b222 - std::panicking::rust_panic_with_hook::h3846eb1b2e5a9312
[INFO] [stderr]                                at src/libstd/panicking.rs:511
[INFO] [stderr]   11:     0x55de9da6ae0b - rust_begin_unwind
[INFO] [stderr]                                at src/libstd/panicking.rs:419
[INFO] [stderr]   12:     0x55de9da8a301 - core::panicking::panic_fmt::hc5953a7331f9805c
[INFO] [stderr]                                at src/libcore/panicking.rs:111
[INFO] [stderr]   13:     0x55de9da8a093 - core::option::expect_failed::hccaff826a2b20c00
[INFO] [stderr]                                at src/libcore/option.rs:1260
[INFO] [stderr]   14:     0x55de9da401cd - core::option::Option<T>::expect::h53fc922ec8b8c839
[INFO] [stderr]                                at /rustc/41997647ba6a77908f6ef64401414feb00bccf16/src/libcore/option.rs:347
[INFO] [stderr]   15:     0x55de9da3de54 - build_script_build::main::hb662c1d87c94b205
[INFO] [stderr]                                at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/core_collections-0.3.20170409/build.rs:48
[INFO] [stderr]   16:     0x55de9da4060b - std::rt::lang_start::{{closure}}::h56a7064b8cbeb61d
[INFO] [stderr]                                at /rustc/41997647ba6a77908f6ef64401414feb00bccf16/src/libstd/rt.rs:67
[INFO] [stderr]   17:     0x55de9da6b668 - std::rt::lang_start_internal::{{closure}}::h76043ceda1ce1596
[INFO] [stderr]                                at src/libstd/rt.rs:52
[INFO] [stderr]   18:     0x55de9da6b668 - std::panicking::try::do_call::hb3d81a78fdf1ed63
[INFO] [stderr]                                at src/libstd/panicking.rs:331
[INFO] [stderr]   19:     0x55de9da6b668 - std::panicking::try::he8d7c35962fb5d7e
[INFO] [stderr]                                at src/libstd/panicking.rs:274
[INFO] [stderr]   20:     0x55de9da6b668 - std::panic::catch_unwind::h643ad9bfe058a347
[INFO] [stderr]                                at src/libstd/panic.rs:394
[INFO] [stderr]   21:     0x55de9da6b668 - std::rt::lang_start_internal::h4b0f023744ce345f
[INFO] [stderr]                                at src/libstd/rt.rs:51
[INFO] [stderr]   22:     0x55de9da405e7 - std::rt::lang_start::hd8c55a4303b9ad18
[INFO] [stderr]                                at /rustc/41997647ba6a77908f6ef64401414feb00bccf16/src/libstd/rt.rs:67
[INFO] [stderr]   23:     0x55de9da3e66a - main
[INFO] [stderr]   24:     0x7f3046d80b97 - __libc_start_main
[INFO] [stderr]   25:     0x55de9da37cda - _start
[INFO] [stderr]   26:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] running `"docker" "inspect" "7aa2cd89dff04fa64513fe1ae8f284044181bc58a1675c3284cb29298eb50e09"`
[INFO] running `"docker" "rm" "-f" "7aa2cd89dff04fa64513fe1ae8f284044181bc58a1675c3284cb29298eb50e09"`
[INFO] [stdout] 7aa2cd89dff04fa64513fe1ae8f284044181bc58a1675c3284cb29298eb50e09