[INFO] fetching crate k2_tree 0.5.3...
[INFO] building k2_tree-0.5.3 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate k2_tree 0.5.3 into /workspace/builds/worker-3-tc2/source
[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-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate k2_tree 0.5.3 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 31 packages to latest compatible versions
[INFO] [stderr]       Adding bitvec v0.17.4 (available: v1.0.1)
[INFO] [stderr]       Adding rand v0.7.3 (available: v0.9.2)
[INFO] [stderr]       Adding serde_yaml v0.8.26 (available: v0.9.34+deprecated)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f88a6a2162310a4bfc3861005af4c354e158341143299115520d00afd08c3d96
[INFO] running `Command { std: "docker" "start" "-a" "f88a6a2162310a4bfc3861005af4c354e158341143299115520d00afd08c3d96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f88a6a2162310a4bfc3861005af4c354e158341143299115520d00afd08c3d96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f88a6a2162310a4bfc3861005af4c354e158341143299115520d00afd08c3d96", kill_on_drop: false }`
[INFO] [stdout] f88a6a2162310a4bfc3861005af4c354e158341143299115520d00afd08c3d96
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 728c4284bb49d68cfc2ebb11b51a6c15a2d0131adc7445ff5e8547a4cc2ce50f
[INFO] running `Command { std: "docker" "start" "-a" "728c4284bb49d68cfc2ebb11b51a6c15a2d0131adc7445ff5e8547a4cc2ce50f", kill_on_drop: false }`
[INFO] [stderr]    Compiling radium v0.3.0
[INFO] [stderr]    Compiling either v1.15.0
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling bitvec v0.17.4
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling serde v1.0.228
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.79s
[INFO] running `Command { std: "docker" "inspect" "728c4284bb49d68cfc2ebb11b51a6c15a2d0131adc7445ff5e8547a4cc2ce50f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "728c4284bb49d68cfc2ebb11b51a6c15a2d0131adc7445ff5e8547a4cc2ce50f", kill_on_drop: false }`
[INFO] [stdout] 728c4284bb49d68cfc2ebb11b51a6c15a2d0131adc7445ff5e8547a4cc2ce50f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 473e7c08b2bd95655545eb3ca71692f0d6ffc0396ff56e9126787e7cefa5cb57
[INFO] running `Command { std: "docker" "start" "-a" "473e7c08b2bd95655545eb3ca71692f0d6ffc0396ff56e9126787e7cefa5cb57", kill_on_drop: false }`
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling linked-hash-map v0.5.6
[INFO] [stderr]    Compiling serde_json v1.0.145
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling yaml-rust v0.4.5
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling serde_yaml v0.8.26
[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/beta-2025-09-21-x86_64-unknown-linux-gnu/lib/librustc_driver-3edb87d56c95729b.so(+0x3c05e8f)[0x7cf396605e8f]
[INFO] [stderr] /lib/x86_64-linux-gnu/libc.so.6(+0x45330)[0x7cf392833330]
[INFO] [stderr] /opt/rustwide/rustup-home/toolchains/beta-2025-09-21-x86_64-unknown-linux-gnu/lib/librustc_driver-3edb87d56c95729b.so(+0x610ea1b)[0x7cf398b0ea1b]
[INFO] [stderr] 
[INFO] [stderr] ### cycle encountered after 3 frames with period 4
[INFO] [stderr] /opt/rustwide/rustup-home/toolchains/beta-2025-09-21-x86_64-unknown-linux-gnu/lib/librustc_driver-3edb87d56c95729b.so(+0x610ea20)[0x7cf398b0ea20]
[INFO] [stderr] /opt/rustwide/rustup-home/toolchains/beta-2025-09-21-x86_64-unknown-linux-gnu/lib/librustc_driver-3edb87d56c95729b.so(+0x610ea20)[0x7cf398b0ea20]
[INFO] [stderr] /opt/rustwide/rustup-home/toolchains/beta-2025-09-21-x86_64-unknown-linux-gnu/lib/librustc_driver-3edb87d56c95729b.so(+0x610ea20)[0x7cf398b0ea20]
[INFO] [stderr] /opt/rustwide/rustup-home/toolchains/beta-2025-09-21-x86_64-unknown-linux-gnu/lib/librustc_driver-3edb87d56c95729b.so(+0x610ea20)[0x7cf398b0ea20]
[INFO] [stderr] ### recursed 63 times
[INFO] [stderr] 
[INFO] [stderr] /opt/rustwide/rustup-home/toolchains/beta-2025-09-21-x86_64-unknown-linux-gnu/lib/librustc_driver-3edb87d56c95729b.so(+0x610ea20)[0x7cf398b0ea20]
[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/beta-2025-09-21-x86_64-unknown-linux-gnu/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,test)' --check-cfg 'cfg(feature, values())' -C metadata=c6dd2367fd942b2f -C extra-filename=-b95fbcf0610ee9b0 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern bitvec=/opt/rustwide/target/debug/deps/libbitvec-569fb7d1560cbb7d.rlib --extern rand=/opt/rustwide/target/debug/deps/librand-752f04d4366aea80.rlib --extern serde=/opt/rustwide/target/debug/deps/libserde-0be8d18437ba1e9e.rlib --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-ac88e2c590f14e66.rlib --extern serde_yaml=/opt/rustwide/target/debug/deps/libserde_yaml-a20d54bbeac88f30.rlib --cap-lints=warn` (signal: 11, SIGSEGV: invalid memory reference)
[INFO] running `Command { std: "docker" "inspect" "473e7c08b2bd95655545eb3ca71692f0d6ffc0396ff56e9126787e7cefa5cb57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "473e7c08b2bd95655545eb3ca71692f0d6ffc0396ff56e9126787e7cefa5cb57", kill_on_drop: false }`
[INFO] [stdout] 473e7c08b2bd95655545eb3ca71692f0d6ffc0396ff56e9126787e7cefa5cb57