tasks map[TaskID]*UserTaskSummary

	// syscallingP and syscallingG represent a binding between a P and G in a syscall.
	// Used to correctly identify and clean up after syscalls (blocking or otherwise).
	syscallingP map[ProcID]GoID
	syscallingG map[GoID]ProcID

	// rangesP is used for optimistic tracking of P-based ranges for goroutines.
	//

				// for multiple generations since trace start, we would have seen
				// a previous GoStatus event that bound the goroutine to an M.
				return curCtx, false, fmt.Errorf("inconsistent thread for syscalling goroutine %d: thread has goroutine %d", gid, curCtx.G)
			}
			newCtx.G = gid
			break
		}
		// Now we're talking about a thread and goroutine that have been

	// with no opportunity to transition.
	//
	// The exception to this rule are goroutines that are concurrently exiting a syscall.
	// Those will all be forced into the syscalling slow path, and we'll just make sure
	// that we don't observe any goroutines in that critical section before starting
	// the world again.
	//