message: Make sure lock on cs_main isn't held before aquiring semaphore grant
  You must not have a cs_main lock before you aquire the semaphore grant
  or you can end up deadlocking.
diff: @@ -442,7 +442,7 @@ void CParallelValidation::HandleBlockMessage(CNode *pfrom,
  uint64_t nBlockSize = block->GetBlockSize();
  // NOTE: You must not have a cs_main lock before you aquire the semaphore grant or you can end up deadlocking
  - // AssertLockNotHeld(cs_main); TODO: need to create this
  + AssertLockNotHeld(cs_main);
  // Aquire semaphore grant
  if (IsChainNearlySyncd())
  