[INFO] crate envelop 0.0.1-alpha.4 is already in cache
[INFO] extracting crate envelop 0.0.1-alpha.4 into work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/reg/envelop/0.0.1-alpha.4
[INFO] extracting crate envelop 0.0.1-alpha.4 into work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/reg/envelop/0.0.1-alpha.4
[INFO] validating manifest of envelop-0.0.1-alpha.4 on toolchain master#60960a260f7b5c695fd0717311d72ce62dd4eb43
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of envelop-0.0.1-alpha.4 on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing envelop-0.0.1-alpha.4
[INFO] finished frobbing envelop-0.0.1-alpha.4
[INFO] frobbed toml for envelop-0.0.1-alpha.4 written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/reg/envelop/0.0.1-alpha.4/Cargo.toml
[INFO] started frobbing envelop-0.0.1-alpha.4
[INFO] finished frobbing envelop-0.0.1-alpha.4
[INFO] frobbed toml for envelop-0.0.1-alpha.4 written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/reg/envelop/0.0.1-alpha.4/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking envelop-0.0.1-alpha.4 against master#60960a260f7b5c695fd0717311d72ce62dd4eb43 for pr-63376
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63376/worker-3/master#60960a260f7b5c695fd0717311d72ce62dd4eb43:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/reg/envelop/0.0.1-alpha.4:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 4e08de2034703a4e014097c2956b24323a0860fc84897a209c4412222af4e94c
[INFO] running `"docker" "start" "-a" "4e08de2034703a4e014097c2956b24323a0860fc84897a209c4412222af4e94c"`
[INFO] [stderr]    Compiling smol_str v0.1.12
[INFO] [stderr]    Compiling c2-chacha v0.2.2
[INFO] [stderr]    Compiling protobuf-codegen v2.8.0
[INFO] [stderr]    Compiling protoc v2.8.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]    Compiling rand_chacha v0.2.1
[INFO] [stderr]    Compiling rand v0.7.0
[INFO] [stderr]    Compiling tempfile v3.1.0
[INFO] [stderr]    Compiling protoc-rust v2.8.0
[INFO] [stderr]    Compiling rust_swig v0.3.0
[INFO] [stderr]    Compiling envelop v0.0.1-alpha.4 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `rust_swig`
[INFO] [stderr]  --> build.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use rust_swig;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: failed to run custom build command for `envelop v0.0.1-alpha.4 (/opt/crater/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/crater/target/debug/build/envelop-35ada43308ee9811/build-script-build` (exit code: 101)
[INFO] [stderr] --- stderr
[INFO] [stderr] thread 'main' panicked at 'protoc: Os { code: 30, kind: Other, message: "Read-only file system" }', src/libcore/result.rs:1084:5
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x5570495b63bb - backtrace::backtrace::libunwind::trace::h2577eef7cb82271e
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.34/src/backtrace/libunwind.rs:88
[INFO] [stderr]    1:     0x5570495b63bb - backtrace::backtrace::trace_unsynchronized::ha9b72a77aa6c4ce9
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.34/src/backtrace/mod.rs:66
[INFO] [stderr]    2:     0x5570495b63bb - std::sys_common::backtrace::_print::h8e2c1c5cda6e4e6e
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:47
[INFO] [stderr]    3:     0x5570495b63bb - std::sys_common::backtrace::print::h7e0f8aad0d8a6f3b
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:36
[INFO] [stderr]    4:     0x5570495b63bb - std::panicking::default_hook::{{closure}}::haae4327ede06a559
[INFO] [stderr]                                at src/libstd/panicking.rs:200
[INFO] [stderr]    5:     0x5570495b6096 - std::panicking::default_hook::hbf5f36093f15fccc
[INFO] [stderr]                                at src/libstd/panicking.rs:214
[INFO] [stderr]    6:     0x5570495b6a7d - std::panicking::rust_panic_with_hook::hf385e0a05e771036
[INFO] [stderr]                                at src/libstd/panicking.rs:477
[INFO] [stderr]    7:     0x5570495b6602 - std::panicking::continue_panic_fmt::h95ba204f85050b4c
[INFO] [stderr]                                at src/libstd/panicking.rs:384
[INFO] [stderr]    8:     0x5570495b64e6 - rust_begin_unwind
[INFO] [stderr]                                at src/libstd/panicking.rs:311
[INFO] [stderr]    9:     0x5570495d4d7d - core::panicking::panic_fmt::h581f7a1e5499d350
[INFO] [stderr]                                at src/libcore/panicking.rs:85
[INFO] [stderr]   10:     0x5570495d4e77 - core::result::unwrap_failed::h863b7818e32f0320
[INFO] [stderr]                                at src/libcore/result.rs:1084
[INFO] [stderr]   11:     0x5570492a2889 - core::result::Result<T,E>::expect::h7c552b326c1dc80c
[INFO] [stderr]                                at /rustc/60960a260f7b5c695fd0717311d72ce62dd4eb43/src/libcore/result.rs:879
[INFO] [stderr]   12:     0x5570492a2d4e - build_script_build::main::haf232f36da42669d
[INFO] [stderr]                                at /opt/crater/workdir/build.rs:6
[INFO] [stderr]   13:     0x5570492a2970 - std::rt::lang_start::{{closure}}::h137642a33aa3d261
[INFO] [stderr]                                at /rustc/60960a260f7b5c695fd0717311d72ce62dd4eb43/src/libstd/rt.rs:64
[INFO] [stderr]   14:     0x5570495b64d3 - std::rt::lang_start_internal::{{closure}}::heabbf1748dc855a1
[INFO] [stderr]                                at src/libstd/rt.rs:49
[INFO] [stderr]   15:     0x5570495b64d3 - std::panicking::try::do_call::hf890723f0a5de9f8
[INFO] [stderr]                                at src/libstd/panicking.rs:296
[INFO] [stderr]   16:     0x5570495bd7ca - __rust_maybe_catch_panic
[INFO] [stderr]                                at src/libpanic_unwind/lib.rs:80
[INFO] [stderr]   17:     0x5570495b6f8d - std::panicking::try::hf36ba5410913b146
[INFO] [stderr]                                at src/libstd/panicking.rs:275
[INFO] [stderr]   18:     0x5570495b6f8d - std::panic::catch_unwind::hdfbba43a8f6b3f51
[INFO] [stderr]                                at src/libstd/panic.rs:394
[INFO] [stderr]   19:     0x5570495b6f8d - std::rt::lang_start_internal::h85d3c6f2844a1656
[INFO] [stderr]                                at src/libstd/rt.rs:48
[INFO] [stderr]   20:     0x5570492a2949 - std::rt::lang_start::h44fa806c7c3dbce6
[INFO] [stderr]                                at /rustc/60960a260f7b5c695fd0717311d72ce62dd4eb43/src/libstd/rt.rs:64
[INFO] [stderr]   21:     0x5570492a2d8a - main
[INFO] [stderr]   22:     0x7f9cd3a2a2e1 - __libc_start_main
[INFO] [stderr]   23:     0x5570492a26ca - _start
[INFO] [stderr]   24:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] running `"docker" "inspect" "4e08de2034703a4e014097c2956b24323a0860fc84897a209c4412222af4e94c"`
[INFO] running `"docker" "rm" "-f" "4e08de2034703a4e014097c2956b24323a0860fc84897a209c4412222af4e94c"`
[INFO] [stdout] 4e08de2034703a4e014097c2956b24323a0860fc84897a209c4412222af4e94c