span.elemsize -= rzSize
		span.largeType.Size_ = span.elemsize
		rzStart := span.base() + span.elemsize
		span.userArenaChunkFree = makeAddrRange(span.base(), rzStart)
		asanpoison(unsafe.Pointer(rzStart), span.limit-rzStart)
		asanunpoison(unsafe.Pointer(span.base()), span.elemsize)
	}

	if rate := MemProfileRate; rate > 0 {
		c := getMCache(mp)
		if c == nil {

			traceRelease(trace)
		}
	}
	if raceenabled {
		racemalloc(v, uintptr(n))
	}
	if msanenabled {
		msanmalloc(v, uintptr(n))
	}
	if asanenabled {
		asanunpoison(v, uintptr(n))
	}
	if stackDebug >= 1 {
		print("  allocated ", v, "\n")
	}
	return stack{uintptr(v), uintptr(v) + uintptr(n)}
}

// stackfree frees an n byte stack allocation at stk.
//

					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()
		}
	}

	// Check for zombie objects.
	if s.freeindex < s.nelems {
		// Everything < freeindex is allocated and hence