[INFO] fetching crate valid_rust_char 0.1.0...
[INFO] testing valid_rust_char-0.1.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate valid_rust_char 0.1.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate valid_rust_char 0.1.0 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate valid_rust_char 0.1.0
[INFO] finished tweaking crates.io crate valid_rust_char 0.1.0
[INFO] tweaked toml for crates.io crate valid_rust_char 0.1.0 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4033f9dee96d2785a7abeaa7957899669f17e469b7cd9b47fbf557e99c8b2bbe
[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" "4033f9dee96d2785a7abeaa7957899669f17e469b7cd9b47fbf557e99c8b2bbe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4033f9dee96d2785a7abeaa7957899669f17e469b7cd9b47fbf557e99c8b2bbe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4033f9dee96d2785a7abeaa7957899669f17e469b7cd9b47fbf557e99c8b2bbe", kill_on_drop: false }`
[INFO] [stdout] 4033f9dee96d2785a7abeaa7957899669f17e469b7cd9b47fbf557e99c8b2bbe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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=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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 3bcf6cf0e98a3ef02a7aad68698161f077a36e0160d2a15fa539c30815fd92ba
[INFO] running `Command { std: "docker" "start" "-a" "3bcf6cf0e98a3ef02a7aad68698161f077a36e0160d2a15fa539c30815fd92ba", kill_on_drop: false }`
[INFO] [stderr]    Compiling valid_rust_char v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error: failed to run custom build command for `valid_rust_char v0.1.0 (/opt/rustwide/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/valid_rust_char-af42477db094e9eb/build-script-build` (exit code: 1)
[INFO] [stderr]   --- stderr
[INFO] [stderr]   Error: Os { code: 30, kind: Other, message: "Read-only file system" }
[INFO] running `Command { std: "docker" "inspect" "3bcf6cf0e98a3ef02a7aad68698161f077a36e0160d2a15fa539c30815fd92ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3bcf6cf0e98a3ef02a7aad68698161f077a36e0160d2a15fa539c30815fd92ba", kill_on_drop: false }`
[INFO] [stdout] 3bcf6cf0e98a3ef02a7aad68698161f077a36e0160d2a15fa539c30815fd92ba