[INFO] cloning repository https://github.com/itsybitesyspider/mallard
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/itsybitesyspider/mallard" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fitsybitesyspider%2Fmallard", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fitsybitesyspider%2Fmallard'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5b73cb1427b033749d0060135eefcb659f443c50
[INFO] building itsybitesyspider/mallard against try#334963c956d25708feab489a3816ae63f639355d for pr-135216
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fitsybitesyspider%2Fmallard" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/itsybitesyspider/mallard on toolchain 334963c956d25708feab489a3816ae63f639355d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+334963c956d25708feab489a3816ae63f639355d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/itsybitesyspider/mallard
[INFO] finished tweaking git repo https://github.com/itsybitesyspider/mallard
[INFO] tweaked toml for git repo https://github.com/itsybitesyspider/mallard written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/itsybitesyspider/mallard already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+334963c956d25708feab489a3816ae63f639355d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded shaderc v0.6.3
[INFO] [stderr]   Downloaded rand_core v0.6.0
[INFO] [stderr]   Downloaded rand v0.8.0
[INFO] [stderr]   Downloaded shaderc-sys v0.6.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+334963c956d25708feab489a3816ae63f639355d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d4d933eda968846171dc1f40269c054228b3be4a959f9081061ab2d67ef8486d
[INFO] running `Command { std: "docker" "start" "-a" "d4d933eda968846171dc1f40269c054228b3be4a959f9081061ab2d67ef8486d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d4d933eda968846171dc1f40269c054228b3be4a959f9081061ab2d67ef8486d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d4d933eda968846171dc1f40269c054228b3be4a959f9081061ab2d67ef8486d", kill_on_drop: false }`
[INFO] [stdout] d4d933eda968846171dc1f40269c054228b3be4a959f9081061ab2d67ef8486d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+334963c956d25708feab489a3816ae63f639355d" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e48209a9070f985a5420830fc23f4e640d3330f9ffb64789b628c48189c0a101
[INFO] running `Command { std: "docker" "start" "-a" "e48209a9070f985a5420830fc23f4e640d3330f9ffb64789b628c48189c0a101", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.56
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling const_fn v0.4.4
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling crossbeam-utils v0.8.1
[INFO] [stderr]    Compiling memoffset v0.6.1
[INFO] [stderr]    Compiling rayon-core v1.9.0
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling slab v0.4.2
[INFO] [stderr]    Compiling quote v1.0.8
[INFO] [stderr]    Compiling raw-window-handle v0.3.3
[INFO] [stderr]    Compiling jobserver v0.1.21
[INFO] [stderr]    Compiling gfx-hal v0.6.0
[INFO] [stderr]    Compiling proc-macro-nested v0.1.6
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling cc v1.0.66
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.1
[INFO] [stderr]    Compiling x11 v2.18.2
[INFO] [stderr]    Compiling crossbeam-channel v0.5.0
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling crossbeam-deque v0.8.0
[INFO] [stderr]    Compiling fxhash v0.2.1
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling rayon v1.5.0
[INFO] [stderr]    Compiling once_cell v1.5.2
[INFO] [stderr]    Compiling smallvec v1.5.1
[INFO] [stderr]    Compiling getrandom v0.2.0
[INFO] [stderr]    Compiling futures-sink v0.3.8
[INFO] [stderr]    Compiling futures-core v0.3.8
[INFO] [stderr]    Compiling futures-channel v0.3.8
[INFO] [stderr]    Compiling cmake v0.1.45
[INFO] [stderr]    Compiling futures-task v0.3.8
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling miniz_oxide v0.4.3
[INFO] [stderr]    Compiling libloading v0.6.6
[INFO] [stderr]    Compiling instant v0.1.9
[INFO] [stderr]    Compiling arrayvec v0.5.2
[INFO] [stderr]    Compiling adler32 v1.2.0
[INFO] [stderr]    Compiling futures-io v0.3.8
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling bit-vec v0.6.3
[INFO] [stderr]    Compiling ash v0.31.0
[INFO] [stderr]    Compiling bit-set v0.5.2
[INFO] [stderr]    Compiling parking_lot_core v0.8.2
[INFO] [stderr]    Compiling shaderc-sys v0.6.3
[INFO] [stderr]    Compiling spirv_headers v1.5.0
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling lock_api v0.4.2
[INFO] [stderr]    Compiling tracing-core v0.1.17
[INFO] [stderr]    Compiling weezl v0.1.3
[INFO] [stderr]    Compiling adler v0.2.3
[INFO] [stderr]    Compiling inplace_it v0.3.2
[INFO] [stderr]    Compiling pin-project-lite v0.2.0
[INFO] [stderr]    Compiling tracing v0.1.22
[INFO] [stderr]    Compiling parking_lot v0.11.1
[INFO] [stderr]    Compiling gfx-descriptor v0.2.0
[INFO] [stderr]    Compiling gfx-backend-empty v0.6.0
[INFO] [stderr]    Compiling gfx-memory v0.2.2
[INFO] [stderr]    Compiling rand_core v0.6.0
[INFO] [stderr] warning: shaderc-sys@0.6.3: Checking for system installed libraries.  Use --features = build-from-source to disable this behavior
[INFO] [stderr] warning: shaderc-sys@0.6.3: System installed library not found.  Falling back to build from source
[INFO] [stderr] error: failed to run custom build command for `shaderc-sys v0.6.3`
[INFO] [stderr] note: To improve backtraces for build dependencies, set the CARGO_PROFILE_DEV_BUILD_OVERRIDE_DEBUG=true environment variable to enable debug information generation.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/shaderc-sys-a0cf073fc6c5f57b/build-script-build` (exit status: 101)
[INFO] [stderr]   --- stdout
[INFO] [stderr]   cargo:warning=Checking for system installed libraries.  Use --features = build-from-source to disable this behavior
[INFO] [stderr]   cargo:warning=System installed library not found.  Falling back to build from source
[INFO] [stderr] 
[INFO] [stderr]   --- stderr
[INFO] [stderr] 
[INFO] [stderr]   thread 'main' panicked at /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/shaderc-sys-0.6.3/build/cmd_finder.rs:50:13:
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr]   couldn't find required command: "python"
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x62265592acba - std::backtrace_rs::backtrace::libunwind::trace::hb592e8fae072c7e3
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
[INFO] [stderr]      1:     0x62265592acba - std::backtrace_rs::backtrace::trace_unsynchronized::h8927fd6287254ed0
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x62265592acba - std::sys::backtrace::_print_fmt::hc83c64bb828feee6
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/sys/backtrace.rs:66:9
[INFO] [stderr]      3:     0x62265592acba - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h57c3f6132393e01d
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/sys/backtrace.rs:39:26
[INFO] [stderr]      4:     0x62265594f473 - core::fmt::rt::Argument::fmt::h4939d14a683ecc7e
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/core/src/fmt/rt.rs:177:76
[INFO] [stderr]      5:     0x62265594f473 - core::fmt::write::h5279a33f365588a6
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/core/src/fmt/mod.rs:1440:21
[INFO] [stderr]      6:     0x6226559271a3 - std::io::Write::write_fmt::h439bcb4e9cbc1e1e
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/io/mod.rs:1887:15
[INFO] [stderr]      7:     0x62265592ab02 - std::sys::backtrace::BacktraceLock::print::h08f61ba9b844b4ac
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/sys/backtrace.rs:42:9
[INFO] [stderr]      8:     0x62265592bda0 - std::panicking::default_hook::{{closure}}::ha7d66a7a8cf0304f
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/panicking.rs:295:22
[INFO] [stderr]      9:     0x62265592bb80 - std::panicking::default_hook::h130dd4cc4e018e28
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/panicking.rs:322:9
[INFO] [stderr]     10:     0x62265592c582 - std::panicking::rust_panic_with_hook::h429a5d73cf660a69
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/panicking.rs:828:13
[INFO] [stderr]     11:     0x62265592c30a - std::panicking::begin_panic_handler::{{closure}}::h8ee26903b8ef2276
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/panicking.rs:701:13
[INFO] [stderr]     12:     0x62265592b1c9 - std::sys::backtrace::__rust_end_short_backtrace::hc830b1279d63031c
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/sys/backtrace.rs:168:18
[INFO] [stderr]     13:     0x62265592bf9d - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/panicking.rs:692:5
[INFO] [stderr]     14:     0x62265594e2e0 - core::panicking::panic_fmt::hd90af040c9b3a7a3
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/core/src/panicking.rs:75:14
[INFO] [stderr]     15:     0x6226558b0f5c - build_script_build::cmd_finder::CommandFinder::must_have::{{closure}}::hf59cb3157c936008
[INFO] [stderr]     16:     0x6226558ae2d3 - core::option::Option<T>::unwrap_or_else::h1fd9414155b7bbc9
[INFO] [stderr]     17:     0x6226558b0edc - build_script_build::cmd_finder::CommandFinder::must_have::h4909309ae809bb54
[INFO] [stderr]     18:     0x6226558b47a9 - build_script_build::main::hcdad657f7a627888
[INFO] [stderr]     19:     0x6226558ad833 - core::ops::function::FnOnce::call_once::h19cc9f9ab66d45e4
[INFO] [stderr]     20:     0x6226558acec6 - std::sys::backtrace::__rust_begin_short_backtrace::hd14aeeb327a2c069
[INFO] [stderr]     21:     0x6226558ace49 - std::rt::lang_start::{{closure}}::hef3466d959efe9d8
[INFO] [stderr]     22:     0x622655922947 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h608e79d482179a73
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/core/src/ops/function.rs:284:13
[INFO] [stderr]     23:     0x622655922947 - std::panicking::try::do_call::h68af151b24870582
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/panicking.rs:584:40
[INFO] [stderr]     24:     0x622655922947 - std::panicking::try::ha3328a6a71abe6a1
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/panicking.rs:547:19
[INFO] [stderr]     25:     0x622655922947 - std::panic::catch_unwind::hab25edf77eece0af
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/panic.rs:358:14
[INFO] [stderr]     26:     0x622655922947 - std::rt::lang_start_internal::{{closure}}::h675ae012d3c7e5f1
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/rt.rs:174:48
[INFO] [stderr]     27:     0x622655922947 - std::panicking::try::do_call::h959dd56984007ef9
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/panicking.rs:584:40
[INFO] [stderr]     28:     0x622655922947 - std::panicking::try::h680ac32c918982f6
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/panicking.rs:547:19
[INFO] [stderr]     29:     0x622655922947 - std::panic::catch_unwind::hdbe022418e45492f
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/panic.rs:358:14
[INFO] [stderr]     30:     0x622655922947 - std::rt::lang_start_internal::h6fa91857d7bd0472
[INFO] [stderr]                                  at /rustc/334963c956d25708feab489a3816ae63f639355d/library/std/src/rt.rs:174:20
[INFO] [stderr]     31:     0x6226558ace27 - std::rt::lang_start::hca64add79612379b
[INFO] [stderr]     32:     0x6226558b5185 - main
[INFO] [stderr]     33:     0x780022757d90 - <unknown>
[INFO] [stderr]     34:     0x780022757e40 - __libc_start_main
[INFO] [stderr]     35:     0x6226558ac495 - _start
[INFO] [stderr]     36:                0x0 - <unknown>
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "e48209a9070f985a5420830fc23f4e640d3330f9ffb64789b628c48189c0a101", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e48209a9070f985a5420830fc23f4e640d3330f9ffb64789b628c48189c0a101", kill_on_drop: false }`
[INFO] [stdout] e48209a9070f985a5420830fc23f4e640d3330f9ffb64789b628c48189c0a101
