[INFO] cloning repository https://github.com/ningxin18/substrate-node-template [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ningxin18/substrate-node-template" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fningxin18%2Fsubstrate-node-template", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fningxin18%2Fsubstrate-node-template'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 890ada031c004ce9a175d9d384ec1c4c18438713 [INFO] checking ningxin18/substrate-node-template against master#c2f2db79ca3024f68d22b45aa22b570775c2c4ad for pr-124305 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fningxin18%2Fsubstrate-node-template" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/ningxin18/substrate-node-template on toolchain c2f2db79ca3024f68d22b45aa22b570775c2c4ad [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/ningxin18/substrate-node-template [INFO] finished tweaking git repo https://github.com/ningxin18/substrate-node-template [INFO] tweaked toml for git repo https://github.com/ningxin18/substrate-node-template written to /workspace/builds/worker-5-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/ningxin18/substrate-node-template 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" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 12 packages to latest compatible versions [INFO] [stderr] Adding callcontracts v3.0.0 (/workspace/builds/worker-5-tc1/source/pallets/callcontracts) [INFO] [stderr] Adding hex-literal v0.2.2 (latest: v0.4.1) [INFO] [stderr] Adding hex-literal-impl v0.2.3 [INFO] [stderr] Adding lite-json v0.1.3 (latest: v0.2.0) [INFO] [stderr] Adding lite-parser v0.1.2 (latest: v0.2.0) [INFO] [stderr] Adding pallet-contracts v3.0.0 (latest: v31.0.0) [INFO] [stderr] Adding pallet-contracts-primitives v3.0.0 (latest: v29.0.0) [INFO] [stderr] Adding pallet-contracts-proc-macro v3.0.0 (latest: v21.0.0) [INFO] [stderr] Adding pallet-contracts-rpc v3.0.0 [INFO] [stderr] Adding pallet-contracts-rpc-runtime-api v3.0.0 [INFO] [stderr] Adding pwasm-utils v0.16.0 (latest: v0.19.0) [INFO] [stderr] Adding sp-sandbox v0.9.0 [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded async-lock v2.3.0 [INFO] [stderr] Downloaded async-mutex v1.4.0 [INFO] [stderr] Downloaded async-global-executor v2.0.2 [INFO] [stderr] Downloaded sp-utils v3.0.0 [INFO] [stderr] Downloaded parity-multiaddr v0.11.2 [INFO] [stderr] Downloaded async-executor v1.4.0 [INFO] [stderr] Downloaded libp2p v0.34.0 [INFO] [stderr] Downloaded asn1_der_derive v0.1.2 [INFO] [stderr] Downloaded which v4.0.2 [INFO] [stderr] Downloaded nohash-hasher v0.2.0 [INFO] [stderr] Downloaded syn v1.0.65 [INFO] [stderr] Downloaded tracing v0.1.25 [INFO] [stderr] Downloaded sc-tracing v3.0.0 [INFO] [stderr] Downloaded jsonrpc-server-utils v15.1.0 [INFO] [stderr] Downloaded fs2 v0.4.3 [INFO] [stderr] Downloaded aes v0.5.0 [INFO] [stderr] Downloaded aesni v0.8.0 [INFO] [stderr] Downloaded kvdb-rocksdb v0.11.0 [INFO] [stderr] Downloaded blake2-rfc v0.2.18 [INFO] [stderr] Downloaded ct-logs v0.7.0 [INFO] [stderr] Downloaded gloo-timers v0.2.1 [INFO] [stderr] Downloaded socket2 v0.4.0 [INFO] [stderr] Downloaded region v2.2.0 [INFO] [stderr] Downloaded psm v0.1.12 [INFO] [stderr] Downloaded sc-executor v0.9.0 [INFO] [stderr] Downloaded pallet-contracts-primitives v3.0.0 [INFO] [stderr] Downloaded sc-consensus-slots v0.9.0 [INFO] [stderr] Downloaded cranelift-frontend v0.69.0 [INFO] [stderr] Downloaded substrate-prometheus-endpoint v0.9.0 [INFO] [stderr] Downloaded prometheus v0.11.0 [INFO] [stderr] Downloaded tokio-timer v0.2.13 [INFO] [stderr] Downloaded sc-state-db v0.9.0 [INFO] [stderr] Downloaded parity-db v0.2.3 [INFO] [stderr] error: failed to parse manifest at `/workspace/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/parity-db-0.2.3/Cargo.toml` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] failed to parse the version requirement `0.11 ` for dependency `parking_lot` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] expected comma after minor version number, found '\t' [ERROR] this task or one of its parent failed! [ERROR] command failed: exit status: 101 [ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace. [INFO] checking ningxin18/substrate-node-template against try#44523379467bbd2050af931a040d10c2b764b443 for pr-124305 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fningxin18%2Fsubstrate-node-template" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/ningxin18/substrate-node-template on toolchain 44523379467bbd2050af931a040d10c2b764b443 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+44523379467bbd2050af931a040d10c2b764b443" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/ningxin18/substrate-node-template [INFO] finished tweaking git repo https://github.com/ningxin18/substrate-node-template [INFO] tweaked toml for git repo https://github.com/ningxin18/substrate-node-template written to /workspace/builds/worker-5-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/ningxin18/substrate-node-template 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" "+44523379467bbd2050af931a040d10c2b764b443" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 12 packages to latest compatible versions [INFO] [stderr] Adding callcontracts v3.0.0 (/workspace/builds/worker-5-tc2/source/pallets/callcontracts) [INFO] [stderr] Adding hex-literal v0.2.2 (latest: v0.4.1) [INFO] [stderr] Adding hex-literal-impl v0.2.3 [INFO] [stderr] Adding lite-json v0.1.3 (latest: v0.2.0) [INFO] [stderr] Adding lite-parser v0.1.2 (latest: v0.2.0) [INFO] [stderr] Adding pallet-contracts v3.0.0 (latest: v31.0.0) [INFO] [stderr] Adding pallet-contracts-primitives v3.0.0 (latest: v29.0.0) [INFO] [stderr] Adding pallet-contracts-proc-macro v3.0.0 (latest: v21.0.0) [INFO] [stderr] Adding pallet-contracts-rpc v3.0.0 [INFO] [stderr] Adding pallet-contracts-rpc-runtime-api v3.0.0 [INFO] [stderr] Adding pwasm-utils v0.16.0 (latest: v0.19.0) [INFO] [stderr] Adding sp-sandbox v0.9.0 [INFO] [stderr] Downloading crates ... [INFO] [stderr] error: failed to download `parity-db v0.2.3` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] unable to get packages from source [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] failed to parse manifest at `/workspace/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/parity-db-0.2.3/Cargo.toml` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] failed to parse the version requirement `0.11 ` for dependency `parking_lot` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] expected comma after minor version number, found '\t' [INFO] checking ningxin18/substrate-node-template against try#44523379467bbd2050af931a040d10c2b764b443 for pr-124305 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fningxin18%2Fsubstrate-node-template" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/ningxin18/substrate-node-template on toolchain 44523379467bbd2050af931a040d10c2b764b443 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+44523379467bbd2050af931a040d10c2b764b443" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/ningxin18/substrate-node-template [INFO] finished tweaking git repo https://github.com/ningxin18/substrate-node-template [INFO] tweaked toml for git repo https://github.com/ningxin18/substrate-node-template written to /workspace/builds/worker-5-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/ningxin18/substrate-node-template 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" "+44523379467bbd2050af931a040d10c2b764b443" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 12 packages to latest compatible versions [INFO] [stderr] Adding callcontracts v3.0.0 (/workspace/builds/worker-5-tc2/source/pallets/callcontracts) [INFO] [stderr] Adding hex-literal v0.2.2 (latest: v0.4.1) [INFO] [stderr] Adding hex-literal-impl v0.2.3 [INFO] [stderr] Adding lite-json v0.1.3 (latest: v0.2.0) [INFO] [stderr] Adding lite-parser v0.1.2 (latest: v0.2.0) [INFO] [stderr] Adding pallet-contracts v3.0.0 (latest: v31.0.0) [INFO] [stderr] Adding pallet-contracts-primitives v3.0.0 (latest: v29.0.0) [INFO] [stderr] Adding pallet-contracts-proc-macro v3.0.0 (latest: v21.0.0) [INFO] [stderr] Adding pallet-contracts-rpc v3.0.0 [INFO] [stderr] Adding pallet-contracts-rpc-runtime-api v3.0.0 [INFO] [stderr] Adding pwasm-utils v0.16.0 (latest: v0.19.0) [INFO] [stderr] Adding sp-sandbox v0.9.0 [INFO] [stderr] Downloading crates ... [INFO] [stderr] error: failed to download `parity-db v0.2.3` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] unable to get packages from source [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] failed to parse manifest at `/workspace/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/parity-db-0.2.3/Cargo.toml` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] failed to parse the version requirement `0.11 ` for dependency `parking_lot` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] expected comma after minor version number, found '\t' [INFO] checking ningxin18/substrate-node-template against try#44523379467bbd2050af931a040d10c2b764b443 for pr-124305 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fningxin18%2Fsubstrate-node-template" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/ningxin18/substrate-node-template on toolchain 44523379467bbd2050af931a040d10c2b764b443 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+44523379467bbd2050af931a040d10c2b764b443" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/ningxin18/substrate-node-template [INFO] finished tweaking git repo https://github.com/ningxin18/substrate-node-template [INFO] tweaked toml for git repo https://github.com/ningxin18/substrate-node-template written to /workspace/builds/worker-5-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/ningxin18/substrate-node-template 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" "+44523379467bbd2050af931a040d10c2b764b443" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 12 packages to latest compatible versions [INFO] [stderr] Adding callcontracts v3.0.0 (/workspace/builds/worker-5-tc2/source/pallets/callcontracts) [INFO] [stderr] Adding hex-literal v0.2.2 (latest: v0.4.1) [INFO] [stderr] Adding hex-literal-impl v0.2.3 [INFO] [stderr] Adding lite-json v0.1.3 (latest: v0.2.0) [INFO] [stderr] Adding lite-parser v0.1.2 (latest: v0.2.0) [INFO] [stderr] Adding pallet-contracts v3.0.0 (latest: v31.0.0) [INFO] [stderr] Adding pallet-contracts-primitives v3.0.0 (latest: v29.0.0) [INFO] [stderr] Adding pallet-contracts-proc-macro v3.0.0 (latest: v21.0.0) [INFO] [stderr] Adding pallet-contracts-rpc v3.0.0 [INFO] [stderr] Adding pallet-contracts-rpc-runtime-api v3.0.0 [INFO] [stderr] Adding pwasm-utils v0.16.0 (latest: v0.19.0) [INFO] [stderr] Adding sp-sandbox v0.9.0 [INFO] [stderr] Downloading crates ... [INFO] [stderr] error: failed to download `parity-db v0.2.3` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] unable to get packages from source [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] failed to parse manifest at `/workspace/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/parity-db-0.2.3/Cargo.toml` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] failed to parse the version requirement `0.11 ` for dependency `parking_lot` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] expected comma after minor version number, found '\t' [INFO] checking ningxin18/substrate-node-template against try#44523379467bbd2050af931a040d10c2b764b443 for pr-124305 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fningxin18%2Fsubstrate-node-template" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/ningxin18/substrate-node-template on toolchain 44523379467bbd2050af931a040d10c2b764b443 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+44523379467bbd2050af931a040d10c2b764b443" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/ningxin18/substrate-node-template [INFO] finished tweaking git repo https://github.com/ningxin18/substrate-node-template [INFO] tweaked toml for git repo https://github.com/ningxin18/substrate-node-template written to /workspace/builds/worker-5-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/ningxin18/substrate-node-template 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" "+44523379467bbd2050af931a040d10c2b764b443" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 12 packages to latest compatible versions [INFO] [stderr] Adding callcontracts v3.0.0 (/workspace/builds/worker-5-tc2/source/pallets/callcontracts) [INFO] [stderr] Adding hex-literal v0.2.2 (latest: v0.4.1) [INFO] [stderr] Adding hex-literal-impl v0.2.3 [INFO] [stderr] Adding lite-json v0.1.3 (latest: v0.2.0) [INFO] [stderr] Adding lite-parser v0.1.2 (latest: v0.2.0) [INFO] [stderr] Adding pallet-contracts v3.0.0 (latest: v31.0.0) [INFO] [stderr] Adding pallet-contracts-primitives v3.0.0 (latest: v29.0.0) [INFO] [stderr] Adding pallet-contracts-proc-macro v3.0.0 (latest: v21.0.0) [INFO] [stderr] Adding pallet-contracts-rpc v3.0.0 [INFO] [stderr] Adding pallet-contracts-rpc-runtime-api v3.0.0 [INFO] [stderr] Adding pwasm-utils v0.16.0 (latest: v0.19.0) [INFO] [stderr] Adding sp-sandbox v0.9.0 [INFO] [stderr] Downloading crates ... [INFO] [stderr] error: failed to download `parity-db v0.2.3` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] unable to get packages from source [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] failed to parse manifest at `/workspace/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/parity-db-0.2.3/Cargo.toml` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] failed to parse the version requirement `0.11 ` for dependency `parking_lot` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] expected comma after minor version number, found '\t' [INFO] checking ningxin18/substrate-node-template against try#44523379467bbd2050af931a040d10c2b764b443 for pr-124305 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fningxin18%2Fsubstrate-node-template" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/ningxin18/substrate-node-template on toolchain 44523379467bbd2050af931a040d10c2b764b443 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+44523379467bbd2050af931a040d10c2b764b443" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/ningxin18/substrate-node-template [INFO] finished tweaking git repo https://github.com/ningxin18/substrate-node-template [INFO] tweaked toml for git repo https://github.com/ningxin18/substrate-node-template written to /workspace/builds/worker-5-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/ningxin18/substrate-node-template 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" "+44523379467bbd2050af931a040d10c2b764b443" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 12 packages to latest compatible versions [INFO] [stderr] Adding callcontracts v3.0.0 (/workspace/builds/worker-5-tc2/source/pallets/callcontracts) [INFO] [stderr] Adding hex-literal v0.2.2 (latest: v0.4.1) [INFO] [stderr] Adding hex-literal-impl v0.2.3 [INFO] [stderr] Adding lite-json v0.1.3 (latest: v0.2.0) [INFO] [stderr] Adding lite-parser v0.1.2 (latest: v0.2.0) [INFO] [stderr] Adding pallet-contracts v3.0.0 (latest: v31.0.0) [INFO] [stderr] Adding pallet-contracts-primitives v3.0.0 (latest: v29.0.0) [INFO] [stderr] Adding pallet-contracts-proc-macro v3.0.0 (latest: v21.0.0) [INFO] [stderr] Adding pallet-contracts-rpc v3.0.0 [INFO] [stderr] Adding pallet-contracts-rpc-runtime-api v3.0.0 [INFO] [stderr] Adding pwasm-utils v0.16.0 (latest: v0.19.0) [INFO] [stderr] Adding sp-sandbox v0.9.0 [INFO] [stderr] Downloading crates ... [INFO] [stderr] error: failed to download `parity-db v0.2.3` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] unable to get packages from source [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] failed to parse manifest at `/workspace/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/parity-db-0.2.3/Cargo.toml` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] failed to parse the version requirement `0.11 ` for dependency `parking_lot` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] expected comma after minor version number, found '\t' [ERROR] this task or one of its parent failed! [ERROR] command failed: exit status: 101 [ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.