}
				// User arenas are handled on explicit free.
				if raceenabled && !s.isUserArenaChunk {
					racefree(unsafe.Pointer(x), size)
				}
				if msanenabled && !s.isUserArenaChunk {
					msanfree(unsafe.Pointer(x), size)
				}
				if asanenabled && !s.isUserArenaChunk {
					asanpoison(unsafe.Pointer(x), size)
				}
			}
			mbits.advance()
			abits.advance()
		}
	}

		}
		return
	}
	if traceAllocFreeEnabled() {
		trace := traceTryAcquire()
		if trace.ok() {
			trace.GoroutineStackFree(uintptr(v))
			traceRelease(trace)
		}
	}
	if msanenabled {
		msanfree(v, n)
	}
	if asanenabled {
		asanpoison(v, n)
	}
	if n < fixedStack<<_NumStackOrders && n < _StackCacheSize {
		order := uint8(0)
		n2 := n
		for n2 > fixedStack {
			order++
			n2 >>= 1

	}

	// Mark the region as free to various sanitizers immediately instead
	// of handling them at sweep time.
	if raceenabled {
		racefree(unsafe.Pointer(s.base()), s.elemsize)
	}
	if msanenabled {
		msanfree(unsafe.Pointer(s.base()), s.elemsize)
	}
	if asanenabled {
		asanpoison(unsafe.Pointer(s.base()), s.elemsize)
	}

	// Make ourselves non-preemptible as we manipulate state and statistics.
	//

		if traceAllocFreeEnabled() {
			trace := traceTryAcquire()
			if trace.ok() {
				trace.SpanFree(s)
				traceRelease(trace)
			}
		}

		lock(&h.lock)
		if msanenabled {
			// Tell msan that this entire span is no longer in use.
			base := unsafe.Pointer(s.base())
			bytes := s.npages << _PageShift
			msanfree(base, bytes)
		}
		if asanenabled {

	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvSpanAlloc, traceSpanID(s), traceArg(s.npages), traceSpanTypeAndClass(s))
}

// SpanFree records an event indicating that the span is about to be freed.
func (tl traceLocker) SpanFree(s *mspan) {
	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvSpanFree, traceSpanID(s))
}

// traceSpanID creates a trace ID for the span s for the trace.

		Name:         "SpanAlloc",
		Args:         []string{"dt", "id", "npages_value", "kindclass"},
		IsTimedEvent: true,
		Experiment:   AllocFree,
	},
	EvSpanFree: event.Spec{
		Name:         "SpanFree",
		Args:         []string{"dt", "id"},
		IsTimedEvent: true,
		Experiment:   AllocFree,
	},
	EvHeapObject: event.Spec{
		Name:         "HeapObject",
		Args:         []string{"dt", "id", "type"},