[INFO] fetching crate rustdemo 0.1.0...
[INFO] testing rustdemo-0.1.0 against 1.100.0-beta.1+cargoflags=--release for beta-release-1.100-2
[INFO] extracting crate rustdemo 0.1.0 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate rustdemo 0.1.0
[INFO] finished tweaking crates.io crate rustdemo 0.1.0
[INFO] tweaked toml for crates.io crate rustdemo 0.1.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rustdemo 0.1.0 on toolchain 1.100.0-beta.1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.100.0-beta.1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.100.0-beta.1" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 21 packages to highest compatible versions
[INFO] [stderr]       Adding num v0.1.43 (available: v0.4.3)
[INFO] [stderr]       Adding rand v0.3.23 (available: v0.10.3)
[INFO] [stderr]       Adding time v0.1.45 (available: v0.3.55)
[INFO] [stderr]       Adding wasi v0.10.0+wasi-snapshot-preview1 (available: v0.10.2+wasi-snapshot-preview1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.100.0-beta.1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] cf0c9fa3e3e3576df66ac02994660e14f875da26f49d166ddece26b70fc9ed5a
[INFO] running `Command { std: "docker" "start" "cf0c9fa3e3e3576df66ac02994660e14f875da26f49d166ddece26b70fc9ed5a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cf0c9fa3e3e3576df66ac02994660e14f875da26f49d166ddece26b70fc9ed5a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "cf0c9fa3e3e3576df66ac02994660e14f875da26f49d166ddece26b70fc9ed5a" "/opt/rustwide/cargo-home/bin/cargo" "+1.100.0-beta.1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cf0c9fa3e3e3576df66ac02994660e14f875da26f49d166ddece26b70fc9ed5a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "cf0c9fa3e3e3576df66ac02994660e14f875da26f49d166ddece26b70fc9ed5a" "/opt/rustwide/cargo-home/bin/cargo" "+1.100.0-beta.1" "build" "--frozen" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-integer v0.1.47
[INFO] [stderr]    Compiling num-bigint v0.1.45
[INFO] [stderr]    Compiling rustc-serialize v0.3.25
[INFO] [stderr]    Compiling num-rational v0.1.43
[INFO] [stderr]    Compiling num-complex v0.1.44
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling time v0.1.45
[INFO] [stderr]    Compiling num-iter v0.1.46
[INFO] [stderr]    Compiling rustdemo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error: failed to run custom build command for `rustdemo v0.1.0 (/opt/rustwide/workdir)`
[INFO] [stderr] note: To improve backtraces for build dependencies, set the CARGO_PROFILE_RELEASE_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/release/build/rustdemo/9d24c85f1b760a83/out/build_script_build` (exit status: 101)
[INFO] [stderr]   --- stderr
[INFO] [stderr] 
[INFO] [stderr]   thread 'main' (267) panicked at build.rs:9:42:
[INFO] [stderr]   called `Result::unwrap()` on an `Err` value: Os { code: 30, kind: ReadOnlyFilesystem, message: "Read-only file system" }
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x634802e0ea51 - <<std[617be2ca0a6fd877]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[a373ad73a504971]::fmt::Display>::fmt
[INFO] [stderr]      1:     0x634802e1f03a - core[a373ad73a504971]::fmt::write
[INFO] [stderr]      2:     0x634802e11b2c - <std[617be2ca0a6fd877]::sys::stdio::unix::Stderr as core[a373ad73a504971]::io::write::Write>::write_fmt
[INFO] [stderr]      3:     0x634802df8d26 - std[617be2ca0a6fd877]::panicking::default_hook::{closure#0}
[INFO] [stderr]      4:     0x634802e0b471 - std[617be2ca0a6fd877]::panicking::default_hook
[INFO] [stderr]      5:     0x634802e0b62b - std[617be2ca0a6fd877]::panicking::panic_with_hook
[INFO] [stderr]      6:     0x634802df8dd2 - std[617be2ca0a6fd877]::panicking::panic_handler::{closure#0}
[INFO] [stderr]      7:     0x634802df1fd9 - std[617be2ca0a6fd877]::sys::backtrace::__rust_end_short_backtrace::<std[617be2ca0a6fd877]::panicking::panic_handler::{closure#0}, !>
[INFO] [stderr]      8:     0x634802df951d - __rustc[ea4f61d10b84890b]::rust_begin_unwind
[INFO] [stderr]      9:     0x634802e1f72c - core[a373ad73a504971]::panicking::panic_fmt
[INFO] [stderr]     10:     0x634802e1f502 - core[a373ad73a504971]::result::unwrap_failed
[INFO] [stderr]     11:     0x634802de3138 - build_script_build[68f36d44e5a7d8dd]::main
[INFO] [stderr]     12:     0x634802de3d73 - <fn() as core[a373ad73a504971]::ops::function::FnOnce<()>>::call_once
[INFO] [stderr]     13:     0x634802de2dee - std[617be2ca0a6fd877]::sys::backtrace::__rust_begin_short_backtrace::<fn(), ()>
[INFO] [stderr]     14:     0x634802de3079 - std[617be2ca0a6fd877]::rt::lang_start::<()>::{closure#0}
[INFO] [stderr]     15:     0x634802e0ac18 - std[617be2ca0a6fd877]::rt::lang_start_internal
[INFO] [stderr]     16:     0x634802de2dc1 - std[617be2ca0a6fd877]::rt::lang_start::<()>
[INFO] [stderr]     17:     0x634802de3f05 - main
[INFO] [stderr]     18:     0x700b834be601 - <unknown>
[INFO] [stderr]     19:     0x700b834be718 - __libc_start_main
[INFO] [stderr]     20:     0x634802de2a85 - _start
[INFO] [stderr]     21:                0x0 - <unknown>
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "cf0c9fa3e3e3576df66ac02994660e14f875da26f49d166ddece26b70fc9ed5a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cf0c9fa3e3e3576df66ac02994660e14f875da26f49d166ddece26b70fc9ed5a", kill_on_drop: false }`
[INFO] [stdout] cf0c9fa3e3e3576df66ac02994660e14f875da26f49d166ddece26b70fc9ed5a
