[INFO] fetching crate tab 0.4.0...
[INFO] documenting tab-0.4.0 against beta-2020-10-09 for beta-1.48-rustdoc-1
[INFO] extracting crate tab 0.4.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate tab 0.4.0 on toolchain beta-2020-10-09
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tab 0.4.0
[INFO] finished tweaking crates.io crate tab 0.4.0
[INFO] tweaked toml for crates.io crate tab 0.4.0 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate crates.io crate tab 0.4.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tab-daemon v0.4.0
[INFO] [stderr]   Downloaded tab-command v0.4.0
[INFO] [stderr]   Downloaded tab-pty v0.4.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e6959565a35733ce824ae62145650bc43e91a6632adb57e1a04e8d9008a21b99
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e6959565a35733ce824ae62145650bc43e91a6632adb57e1a04e8d9008a21b99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e6959565a35733ce824ae62145650bc43e91a6632adb57e1a04e8d9008a21b99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e6959565a35733ce824ae62145650bc43e91a6632adb57e1a04e8d9008a21b99", kill_on_drop: false }`
[INFO] [stdout] e6959565a35733ce824ae62145650bc43e91a6632adb57e1a04e8d9008a21b99
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5b1cf7d0ad6b9cb8e5f4dfa80f95e2858a55618029c3455ca881160613140c28
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "5b1cf7d0ad6b9cb8e5f4dfa80f95e2858a55618029c3455ca881160613140c28", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.44
[INFO] [stderr]     Checking futures-core v0.3.6
[INFO] [stderr]     Checking futures-io v0.3.6
[INFO] [stderr]     Checking unicode_categories v0.1.1
[INFO] [stderr]     Checking futures-task v0.3.6
[INFO] [stderr]     Checking termios v0.3.2
[INFO] [stderr]     Checking mio v0.7.3
[INFO] [stderr]     Checking combine v3.8.1
[INFO] [stderr]     Checking dirs v3.0.1
[INFO] [stderr]     Checking simplelog v0.8.0
[INFO] [stderr]    Compiling tab v0.4.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking rayon v1.4.1
[INFO] [stderr]     Checking tungstenite v0.11.1
[INFO] [stderr]     Checking futures-channel v0.3.6
[INFO] [stderr]     Checking console v0.11.3
[INFO] [stderr]     Checking signal-hook v0.1.16
[INFO] [stderr]     Checking crossterm v0.17.7
[INFO] [stderr]     Checking dialoguer v0.6.2
[INFO] [stderr] error: failed to run custom build command for `tab v0.4.0 (/opt/rustwide/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/tab-1bfffe57ff8b412a/build-script-build` (exit code: 101)
[INFO] [stderr]   --- stderr
[INFO] [stderr]   thread 'main' panicked at 'failed to create ./target/completions: Os { code: 30, kind: Other, message: "Read-only file system" }', build.rs:13:45
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x559509181d40 - std::backtrace_rs::backtrace::libunwind::trace::h7cf3ca97bd83fbab
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/../../backtrace/src/backtrace/libunwind.rs:96
[INFO] [stderr]      1:     0x559509181d40 - std::backtrace_rs::backtrace::trace_unsynchronized::h5a69c674b2d9ea5c
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/../../backtrace/src/backtrace/mod.rs:66
[INFO] [stderr]      2:     0x559509181d40 - std::sys_common::backtrace::_print_fmt::hdf72478dfcb50678
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:79
[INFO] [stderr]      3:     0x559509181d40 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h1e0bdbb35e83deca
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:58
[INFO] [stderr]      4:     0x55950919ae5c - core::fmt::write::he67f9b17bcb7ee73
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/core/src/fmt/mod.rs:1080
[INFO] [stderr]      5:     0x55950917fe32 - std::io::Write::write_fmt::hac97d5cb5753e2ec
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/io/mod.rs:1516
[INFO] [stderr]      6:     0x559509183e6d - std::sys_common::backtrace::_print::haa20918e28a126c5
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:61
[INFO] [stderr]      7:     0x559509183e6d - std::sys_common::backtrace::print::h49e772a4873d9076
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:48
[INFO] [stderr]      8:     0x559509183e6d - std::panicking::default_hook::{{closure}}::hb218b305d15e3f11
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:208
[INFO] [stderr]      9:     0x559509183b18 - std::panicking::default_hook::h63997b7b949e1ce0
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:227
[INFO] [stderr]     10:     0x5595091844f1 - std::panicking::rust_panic_with_hook::hb54f09ccadf64bd3
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:577
[INFO] [stderr]     11:     0x559509184099 - std::panicking::begin_panic_handler::{{closure}}::h8b43445b254eeb30
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:484
[INFO] [stderr]     12:     0x5595091821cc - std::sys_common::backtrace::__rust_end_short_backtrace::hacd691450edfeae0
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:153
[INFO] [stderr]     13:     0x559509184059 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:483
[INFO] [stderr]     14:     0x55950919a171 - core::panicking::panic_fmt::h5b17d4a0e853d0f5
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/core/src/panicking.rs:85
[INFO] [stderr]     15:     0x559509199f93 - core::option::expect_none_failed::hd08bf36cae411fff
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/core/src/option.rs:1234
[INFO] [stderr]     16:     0x5595091440cf - core::result::Result<T,E>::expect::hec230ea5d16aef61
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/core/src/result.rs:933
[INFO] [stderr]     17:     0x5595090ff2c7 - build_script_build::main::h6146ca8d901f5aec
[INFO] [stderr]                                  at /opt/rustwide/workdir/build.rs:13
[INFO] [stderr]     18:     0x5595091033eb - core::ops::function::FnOnce::call_once::hb4f78f45e13aac05
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/core/src/ops/function.rs:227
[INFO] [stderr]     19:     0x55950910168e - std::sys_common::backtrace::__rust_begin_short_backtrace::h84473b8f18a7a97e
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:137
[INFO] [stderr]     20:     0x5595091011e1 - std::rt::lang_start::{{closure}}::hfd5b7855ea9935b9
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/rt.rs:66
[INFO] [stderr]     21:     0x559509184917 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h908982dfc31b926f
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/core/src/ops/function.rs:259
[INFO] [stderr]     22:     0x559509184917 - std::panicking::try::do_call::h92777899503b7584
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:381
[INFO] [stderr]     23:     0x559509184917 - std::panicking::try::h8815656b2b76e792
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:345
[INFO] [stderr]     24:     0x559509184917 - std::panic::catch_unwind::h112ab81228f50b46
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panic.rs:382
[INFO] [stderr]     25:     0x559509184917 - std::rt::lang_start_internal::h1772a706c7575c24
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/rt.rs:51
[INFO] [stderr]     26:     0x5595091011b7 - std::rt::lang_start::hfe78043c0ba47d2e
[INFO] [stderr]                                  at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/rt.rs:65
[INFO] [stderr]     27:     0x55950910073a - main
[INFO] [stderr]     28:     0x7f9a139c10b3 - __libc_start_main
[INFO] [stderr]     29:     0x5595090ff0be - _start
[INFO] [stderr]     30:                0x0 - <unknown>
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "5b1cf7d0ad6b9cb8e5f4dfa80f95e2858a55618029c3455ca881160613140c28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b1cf7d0ad6b9cb8e5f4dfa80f95e2858a55618029c3455ca881160613140c28", kill_on_drop: false }`
[INFO] [stdout] 5b1cf7d0ad6b9cb8e5f4dfa80f95e2858a55618029c3455ca881160613140c28
