[INFO] cloning repository https://github.com/NightD116/cb4
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/NightD116/cb4" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNightD116%2Fcb4", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNightD116%2Fcb4'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2398502e17f469b120fd23406e0d85e818de194c
[INFO] checking NightD116/cb4/2398502e17f469b120fd23406e0d85e818de194c against master#f609b7e0586f81fefb3523e3e17adf779ac416be for pr-129466-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNightD116%2Fcb4" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/NightD116/cb4 on toolchain f609b7e0586f81fefb3523e3e17adf779ac416be
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/NightD116/cb4
[INFO] finished tweaking git repo https://github.com/NightD116/cb4
[INFO] tweaked toml for git repo https://github.com/NightD116/cb4 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/NightD116/cb4 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" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rust-bison-skeleton v0.41.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 267c579b9c8340de5567e9462a4e6de0341a716a408d77bafceeca2228b0e124
[INFO] running `Command { std: "docker" "start" "-a" "267c579b9c8340de5567e9462a4e6de0341a716a408d77bafceeca2228b0e124", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "267c579b9c8340de5567e9462a4e6de0341a716a408d77bafceeca2228b0e124", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "267c579b9c8340de5567e9462a4e6de0341a716a408d77bafceeca2228b0e124", kill_on_drop: false }`
[INFO] [stdout] 267c579b9c8340de5567e9462a4e6de0341a716a408d77bafceeca2228b0e124
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d205d7bbf4e993c38c4dfa7092619f2624dfee9d06a76070fd8e5a9bcf8438d5
[INFO] running `Command { std: "docker" "start" "-a" "d205d7bbf4e993c38c4dfa7092619f2624dfee9d06a76070fd8e5a9bcf8438d5", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.96
[INFO] [stderr]    Compiling beef v0.5.2
[INFO] [stderr]    Compiling regex-syntax v0.6.26
[INFO] [stderr]    Compiling rust-bison-skeleton v0.41.0
[INFO] [stderr]    Compiling cb-4 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error: failed to run custom build command for `cb-4 v0.1.0 (/opt/rustwide/workdir)`
[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/cb-4-cb268747ab195759/build-script-build` (exit status: 1)
[INFO] [stderr]   --- stderr
[INFO] [stderr]   CARGO_MANIFEST_DIR = "/opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/rust-bison-skeleton-0.41.0"
[INFO] [stderr]   file = "/opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/rust-bison-skeleton-0.41.0/src/lib.rs"
[INFO] [stderr]   current dir = Ok("/opt/rustwide/workdir")
[INFO] [stderr]   Bison error:
[INFO] [stderr]   bison: src/parser/minako_syntax.rs: cannot open: Read-only file system
[INFO] [stderr] 
[INFO] [stderr]   exiting with 1
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "d205d7bbf4e993c38c4dfa7092619f2624dfee9d06a76070fd8e5a9bcf8438d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d205d7bbf4e993c38c4dfa7092619f2624dfee9d06a76070fd8e5a9bcf8438d5", kill_on_drop: false }`
[INFO] [stdout] d205d7bbf4e993c38c4dfa7092619f2624dfee9d06a76070fd8e5a9bcf8438d5