diff -Nur jemalloc-5.2.1/src/arena.c tmp/src/arena.c
--- jemalloc-5.2.1/src/arena.c	2019-08-06 04:02:00.000000000 +0800
+++ tmp/src/arena.c	2021-11-03 10:23:41.243648055 +0800
@@ -199,13 +199,12 @@
 	malloc_mutex_lock(tsdn, &arena->tcache_ql_mtx);
 	cache_bin_array_descriptor_t *descriptor;
 	ql_foreach(descriptor, &arena->cache_bin_array_descriptor_ql, link) {
-		szind_t i = 0;
-		for (; i < SC_NBINS; i++) {
+		for (szind_t i = 0; i < SC_NBINS; i++) {
 			cache_bin_t *tbin = &descriptor->bins_small[i];
 			arena_stats_accum_zu(&astats->tcache_bytes,
 			    tbin->ncached * sz_index2size(i));
 		}
-		for (; i < nhbins; i++) {
+		for (szind_t i = 0; i < nhbins - SC_NBINS; i++) {
 			cache_bin_t *tbin = &descriptor->bins_large[i];
 			arena_stats_accum_zu(&astats->tcache_bytes,
 			    tbin->ncached * sz_index2size(i));