[INFO] fetching crate k2_tree 0.5.3...
[INFO] building k2_tree-0.5.3 against master#70591dc15db32941fe3595fdbf98e58d6975f95e for pr-127731
[INFO] extracting crate k2_tree 0.5.3 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate k2_tree 0.5.3 on toolchain 70591dc15db32941fe3595fdbf98e58d6975f95e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+70591dc15db32941fe3595fdbf98e58d6975f95e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate k2_tree 0.5.3
[INFO] finished tweaking crates.io crate k2_tree 0.5.3
[INFO] tweaked toml for crates.io crate k2_tree 0.5.3 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+70591dc15db32941fe3595fdbf98e58d6975f95e" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 32 packages to latest compatible versions
[INFO] [stderr]       Adding bitvec v0.17.4 (latest: v1.0.1)
[INFO] [stderr]       Adding getrandom v0.1.16 (latest: v0.2.15)
[INFO] [stderr]       Adding hashbrown v0.12.3 (latest: v0.14.5)
[INFO] [stderr]       Adding indexmap v1.9.3 (latest: v2.3.0)
[INFO] [stderr]       Adding radium v0.3.0 (latest: v1.1.0)
[INFO] [stderr]       Adding rand v0.7.3 (latest: v0.8.5)
[INFO] [stderr]       Adding rand_chacha v0.2.2 (latest: v0.3.1)
[INFO] [stderr]       Adding rand_core v0.5.1 (latest: v0.6.4)
[INFO] [stderr]       Adding rand_hc v0.2.0 (latest: v0.3.2)
[INFO] [stderr]       Adding serde_yaml v0.8.26 (latest: v0.9.34+deprecated)
[INFO] [stderr]       Adding wasi v0.9.0+wasi-snapshot-preview1 (latest: v0.13.1+wasi-0.2.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+70591dc15db32941fe3595fdbf98e58d6975f95e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bitvec v0.17.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+70591dc15db32941fe3595fdbf98e58d6975f95e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cbd55f369b3e540d9275030ab342842f77adeb2031f548b37d21f0690ead5943
[INFO] running `Command { std: "docker" "start" "-a" "cbd55f369b3e540d9275030ab342842f77adeb2031f548b37d21f0690ead5943", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cbd55f369b3e540d9275030ab342842f77adeb2031f548b37d21f0690ead5943", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cbd55f369b3e540d9275030ab342842f77adeb2031f548b37d21f0690ead5943", kill_on_drop: false }`
[INFO] [stdout] cbd55f369b3e540d9275030ab342842f77adeb2031f548b37d21f0690ead5943
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+70591dc15db32941fe3595fdbf98e58d6975f95e" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1227ff7ce3cc97657aaa3100c50df6f6d1e0474e717c759c71ff5eea6d747004
[INFO] running `Command { std: "docker" "start" "-a" "1227ff7ce3cc97657aaa3100c50df6f6d1e0474e717c759c71ff5eea6d747004", kill_on_drop: false }`
[INFO] [stderr]    Compiling radium v0.3.0
[INFO] [stderr]    Compiling either v1.13.0
[INFO] [stderr]    Compiling syn v2.0.74
[INFO] [stderr]    Compiling bitvec v0.17.4
[INFO] [stderr]    Compiling serde_derive v1.0.206
[INFO] [stderr]    Compiling serde v1.0.206
[INFO] [stderr]    Compiling k2_tree v0.5.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `datastore::*`
[INFO] [stdout]  --> src/tree/mod.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub use datastore::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.13s
[INFO] running `Command { std: "docker" "inspect" "1227ff7ce3cc97657aaa3100c50df6f6d1e0474e717c759c71ff5eea6d747004", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1227ff7ce3cc97657aaa3100c50df6f6d1e0474e717c759c71ff5eea6d747004", kill_on_drop: false }`
[INFO] [stdout] 1227ff7ce3cc97657aaa3100c50df6f6d1e0474e717c759c71ff5eea6d747004
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+70591dc15db32941fe3595fdbf98e58d6975f95e" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 801d1f5450f38ac7be7c24612d117a0ac6e32e10bd70eac9c3e4dda4a313aee9
[INFO] running `Command { std: "docker" "start" "-a" "801d1f5450f38ac7be7c24612d117a0ac6e32e10bd70eac9c3e4dda4a313aee9", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.155
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling byteorder v1.5.0
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling indexmap v1.9.3
[INFO] [stderr]    Compiling linked-hash-map v0.5.6
[INFO] [stderr]    Compiling serde_json v1.0.123
[INFO] [stderr]    Compiling zerocopy-derive v0.7.35
[INFO] [stdout] warning: unused import: `datastore::*`
[INFO] [stdout]  --> src/tree/mod.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub use datastore::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling yaml-rust v0.4.5
[INFO] [stderr]    Compiling zerocopy v0.7.35
[INFO] [stderr]    Compiling serde_yaml v0.8.26
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling ppv-lite86 v0.2.20
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling k2_tree v0.5.3 (/opt/rustwide/workdir)
[INFO] [stderr] error: rustc interrupted by SIGSEGV, printing backtrace
[INFO] [stderr] 
[INFO] [stderr] /opt/rustwide/rustup-home/toolchains/70591dc15db32941fe3595fdbf98e58d6975f95e/lib/librustc_driver-e68465d7b7aa9cbf.so(+0x34deb23)[0x7f58da4deb23]
[INFO] [stderr] /lib/x86_64-linux-gnu/libc.so.6(+0x42520)[0x7f58d6cd5520]
[INFO] [stderr] /opt/rustwide/rustup-home/toolchains/70591dc15db32941fe3595fdbf98e58d6975f95e/lib/librustc_driver-e68465d7b7aa9cbf.so(_RNvXsm_NtCs7MMvtIZrH9p_12rustc_expand6expandNtB5_19InvocationCollectorNtNtCscIrXBy6Rkll_9rustc_ast9mut_visit10MutVisitor10visit_expr+0x8f)[0x7f58dc17cc4f]
[INFO] [stderr] 
[INFO] [stderr] ### cycle encountered after 3 frames with period 4
[INFO] [stderr] /opt/rustwide/rustup-home/toolchains/70591dc15db32941fe3595fdbf98e58d6975f95e/lib/librustc_driver-e68465d7b7aa9cbf.so(+0x517d9a2)[0x7f58dc17d9a2]
[INFO] [stderr] /opt/rustwide/rustup-home/toolchains/70591dc15db32941fe3595fdbf98e58d6975f95e/lib/librustc_driver-e68465d7b7aa9cbf.so(_RNvXsm_NtCs7MMvtIZrH9p_12rustc_expand6expandNtB5_19InvocationCollectorNtNtCscIrXBy6Rkll_9rustc_ast9mut_visit10MutVisitor10visit_expr+0x94)[0x7f58dc17cc54]
[INFO] [stderr] /opt/rustwide/rustup-home/toolchains/70591dc15db32941fe3595fdbf98e58d6975f95e/lib/librustc_driver-e68465d7b7aa9cbf.so(+0x517d9a2)[0x7f58dc17d9a2]
[INFO] [stderr] /opt/rustwide/rustup-home/toolchains/70591dc15db32941fe3595fdbf98e58d6975f95e/lib/librustc_driver-e68465d7b7aa9cbf.so(_RNvXsm_NtCs7MMvtIZrH9p_12rustc_expand6expandNtB5_19InvocationCollectorNtNtCscIrXBy6Rkll_9rustc_ast9mut_visit10MutVisitor10visit_expr+0x94)[0x7f58dc17cc54]
[INFO] [stderr] ### recursed 63 times
[INFO] [stderr] 
[INFO] [stderr] /opt/rustwide/rustup-home/toolchains/70591dc15db32941fe3595fdbf98e58d6975f95e/lib/librustc_driver-e68465d7b7aa9cbf.so(+0x517d9a2)[0x7f58dc17d9a2]
[INFO] [stderr] 
[INFO] [stderr] note: rustc unexpectedly overflowed its stack! this is a bug
[INFO] [stderr] note: maximum backtrace depth reached, frames may have been lost
[INFO] [stderr] note: we would appreciate a report at https://github.com/rust-lang/rust
[INFO] [stderr] help: you can increase rustc's stack size by setting RUST_MIN_STACK=16777216
[INFO] [stderr] error: could not compile `k2_tree` (lib test)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/70591dc15db32941fe3595fdbf98e58d6975f95e/bin/rustc --crate-name k2_tree --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --test --check-cfg 'cfg(docsrs)' --check-cfg 'cfg(feature, values())' -C metadata=958cff9a047cca53 -C extra-filename=-958cff9a047cca53 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern bitvec=/opt/rustwide/target/debug/deps/libbitvec-55ac5bcca6bd32c5.rlib --extern rand=/opt/rustwide/target/debug/deps/librand-1c119221cd2c6ccf.rlib --extern serde=/opt/rustwide/target/debug/deps/libserde-a1611267594ad7fb.rlib --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-439175b1e5977ee1.rlib --extern serde_yaml=/opt/rustwide/target/debug/deps/libserde_yaml-ba8e418007a0e0cc.rlib --cap-lints=forbid` (signal: 11, SIGSEGV: invalid memory reference)
[INFO] running `Command { std: "docker" "inspect" "801d1f5450f38ac7be7c24612d117a0ac6e32e10bd70eac9c3e4dda4a313aee9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "801d1f5450f38ac7be7c24612d117a0ac6e32e10bd70eac9c3e4dda4a313aee9", kill_on_drop: false }`
[INFO] [stdout] 801d1f5450f38ac7be7c24612d117a0ac6e32e10bd70eac9c3e4dda4a313aee9