diff --git a/fs/bcachefs/alloc_foreground.c b/fs/bcachefs/alloc_foreground.c
index cc12baa1a09f..cc0a202afdd2 100644
--- a/fs/bcachefs/alloc_foreground.c
+++ b/fs/bcachefs/alloc_foreground.c
@@ -1631,6 +1631,9 @@ void bch2_fs_alloc_debug_to_text(struct printbuf *out, struct bch_fs *c)
 		nr[c->open_buckets[i].data_type]++;
 
 	printbuf_tabstop_push(out, 24);
+
+	percpu_down_read(&c->mark_lock);
+
 	prt_printf(out, "hidden\t%llu\n",		bch2_fs_usage_read_one(c, &c->usage_base->b.hidden));
 	prt_printf(out, "btree\t%llu\n",		bch2_fs_usage_read_one(c, &c->usage_base->b.btree));
 	prt_printf(out, "data\t%llu\n",			bch2_fs_usage_read_one(c, &c->usage_base->b.data));
@@ -1647,6 +1650,8 @@ void bch2_fs_alloc_debug_to_text(struct printbuf *out, struct bch_fs *c)
 	prt_printf(out, "open_buckets_btree\t%u\n",		nr[BCH_DATA_btree]);
 	prt_printf(out, "open_buckets_user\t%u\n",		nr[BCH_DATA_user]);
 	prt_printf(out, "btree reserve cache\t%u\n",		c->btree_reserve_cache_nr);
+
+	percpu_up_read(&c->mark_lock);
 }
 
 void bch2_print_allocator_stuck(struct bch_fs *c)