message: Bug fix: avoid use-of-uninitialized-value
diff: @@ -157,7 +157,8 @@ class ThreadWorkSource {
  blocking_inflight_(0),
  non_blocking_inflight_(0),
  traceme_id_(0),
  - version_(0) {
  + version_(0),
  + sub_thread_pool_waiter_(nullptr) {
  queue_waiters_.next = &queue_waiters_;
  queue_waiters_.prev = &queue_waiters_;
  for (int i = 0; i < NonBlockingWorkShardingFactor(); ++i) {
  