[INFO] updating cached repository https://github.com/tcrustifarians/rust-rack
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] fd13a10000dbdc674ed943f531f98f8ebdc3a210
[INFO] testing tcrustifarians/rust-rack against master#28742a1146f10a4f09369baad027a464acb7a766 for pr-71274
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftcrustifarians%2Frust-rack" "/workspace/builds/worker-13/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tcrustifarians/rust-rack on toolchain 28742a1146f10a4f09369baad027a464acb7a766
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/tcrustifarians/rust-rack
[INFO] finished tweaking git repo https://github.com/tcrustifarians/rust-rack
[INFO] tweaked toml for git repo https://github.com/tcrustifarians/rust-rack written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/tcrustifarians/rust-rack already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /workspace/builds/worker-13/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "build" "--frozen"`
[INFO] [stdout] f2194e810ac04a18c9718ad4e6476e8def9774017c9e63dc09864acc4ae0f506
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "f2194e810ac04a18c9718ad4e6476e8def9774017c9e63dc09864acc4ae0f506"`
[INFO] [stderr]    Compiling rack v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: the feature `cstr_to_str` has been stable since 1.4.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/lib.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(cstr_to_str)]
[INFO] [stderr]   |            ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: linking with `cc` failed: exit code: 1
[INFO] [stderr]   |
[INFO] [stderr]   = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-L" "/opt/rustwide/rustup-home/toolchains/28742a1146f10a4f09369baad027a464acb7a766/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.10.rcgu.o" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.11.rcgu.o" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.12.rcgu.o" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.13.rcgu.o" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.14.rcgu.o" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.15.rcgu.o" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/rack.rack.3jh0vae3-cgu.9.rcgu.o" "-o" "/opt/rustwide/target/debug/deps/librack.so" "-Wl,--version-script=/tmp/rustcTlZkrI/list" "/opt/rustwide/target/debug/deps/rack.4tx51eg3ml2a87d5.rcgu.o" "/opt/rustwide/target/debug/deps/rack.2ty4m3h8zezum52p.rcgu.o" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/rustup-home/toolchains/28742a1146f10a4f09369baad027a464acb7a766/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-lruby" "-Wl,-Bstatic" "-Wl,--whole-archive" "/tmp/rustcTlZkrI/liblibc-7f3b8e4c2db2a8d8.rlib" "-Wl,--no-whole-archive" "-Wl,--start-group" "-Wl,--whole-archive" "/tmp/rustcTlZkrI/libstd-1dac1a412c98f50d.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcTlZkrI/libpanic_unwind-b7841fd014bf83a1.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcTlZkrI/libhashbrown-338c0763450dca22.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcTlZkrI/librustc_std_workspace_alloc-5f2e5d11836e0967.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcTlZkrI/libbacktrace-81a9070bd3553adf.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcTlZkrI/libbacktrace_sys-e297830377b95af4.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcTlZkrI/librustc_demangle-b38b87f2dd197fa0.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcTlZkrI/libunwind-601015f2e15e7e26.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcTlZkrI/libcfg_if-439f3a589bd88586.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcTlZkrI/liblibc-57ab7e6ac23ce11f.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcTlZkrI/liballoc-3aec7f88778e912a.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcTlZkrI/librustc_std_workspace_core-b6806800b307d4b9.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcTlZkrI/libcore-e49d7651b12f7563.rlib" "-Wl,--no-whole-archive" "-Wl,--end-group" "/tmp/rustcTlZkrI/libcompiler_builtins-e8266574e26adcc3.rlib" "-Wl,-Bdynamic" "-lutil" "-ldl" "-lutil" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-ldl" "-lutil" "-shared"
[INFO] [stderr]   = note: /usr/bin/ld: cannot find -lruby
[INFO] [stderr]           collect2: error: ld returned 1 exit status
[INFO] [stderr]           
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `rack`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f2194e810ac04a18c9718ad4e6476e8def9774017c9e63dc09864acc4ae0f506"`
[INFO] running `"docker" "rm" "-f" "f2194e810ac04a18c9718ad4e6476e8def9774017c9e63dc09864acc4ae0f506"`
[INFO] [stdout] f2194e810ac04a18c9718ad4e6476e8def9774017c9e63dc09864acc4ae0f506