deadlockid

Deadlockid is a unique identifier used to label a deadlock event in a computerized system. The term is used in some debugging and tracing practices to mark a specific occurrence of a deadlock, enabling efficient logging, correlation, and postmortem analysis. It is not a universally standardized concept, but a practical aid in environments where multiple processes, threads, or services may contribute to a deadlock.

Generation and format: A deadlockid is typically generated when a deadlock is detected or when diagnostic instrumentation begins tracing. Formats vary; common approaches include a UUID, a timestamped string, or a composite that encodes origin and involved resources. Example: deadlockid=550e8400-e29b-41d4-a716-446655440000 or deadlockid=20241101T141500Z-nodeA-tid1234. The choice depends on tooling and the level of traceability required.

Usage: The identifier is attached to all relevant log entries, metrics, and traces during the deadlock event, so developers can aggregate data from multiple components and reconstruct the wait-for graph or resource allocation sequence. In distributed systems, the deadlockid may propagate across services through tracing headers (for example, OTEL trace context or custom headers).

Limitations and considerations: Generating deadlockids imposes small overhead and requires consistent propagation across all components; improper handling can fragment traces or cause collisions. It is a diagnostic convention rather than a formal mechanism in most systems.

See also: Deadlock, Wait-for graph, Resource allocation graph, Distributed tracing, OpenTelemetry, Logging