Memory limitations in WASM extensions

1

Hi,
Are there any limitations on memory allocation within a WASM extension using V8 runtime? I am not able to allocate more than 10MB when storing in an array. I am able to allocate additional memory outside of an array though.
My code:

bool FilterRootContext::onStart(size_t) {
  LOG_WARN("onStart");
  size_t max_size_mb=1000;
  size_t testedMemCapacityMB = -1;
  size_t testedMemCapacityMB1 = -1;
  if (max_size_mb == 0) { return 0;}
  void *memblocks[max_size_mb];
  void *memblocks1[max_size_mb];
  int testedMemCapacity = 0;
  int testedMemCapacity1 = 0;
  do {
    memblocks[testedMemCapacity] = malloc(2097152); // 2MB
  } while (memblocks[testedMemCapacity] != nullptr && ++testedMemCapacity < max_size_mb);
  testedMemCapacityMB = testedMemCapacity;

  do {
    memblocks1[testedMemCapacity1] = malloc(2097152); // 2MB
  } while (memblocks1[testedMemCapacity1] != nullptr && ++testedMemCapacity1 < max_size_mb);
  testedMemCapacityMB1 = testedMemCapacity1;

  char* ptr =NULL;
  if ((ptr =(char*)malloc(209715200)) == NULL) {
    LOG_WARN(std::string("Additional Allocation failed ") );
  } else {
    LOG_WARN(std::string("Additional Allocation is successful ") );
  }

  for (int j = 0; j < testedMemCapacityMB; j++) {
    free(memblocks[j]);
  }
  for (int j = 0; j < testedMemCapacityMB1; j++) {
    free(memblocks1[j]);
  }
  LOG_WARN(std::string("Allocated: ") + std::to_string(testedMemCapacityMB));
  LOG_WARN(std::string("Allocated1: ") + std::to_string(testedMemCapacityMB1));
  
  return true;
}

Here is the log generated:

2021-09-07T15:59:09.700580Z	warning	envoy wasm	wasm log my_root_id shipping-vm-id: [extensions/service-mesh/example-filter/filter.cc:29]::onStart() onStart
2021-09-07T15:59:09.700627Z	warning	envoy wasm	wasm log my_root_id shipping-vm-id: [extensions/service-mesh/example-filter/filter.cc:52]::onStart() Additional Allocation is successful 
2021-09-07T15:59:09.700631Z	warning	envoy wasm	wasm log my_root_id shipping-vm-id: [extensions/service-mesh/example-filter/filter.cc:61]::onStart() Allocated: 5
2021-09-07T15:59:09.700636Z	warning	envoy wasm	wasm log my_root_id shipping-vm-id: [extensions/service-mesh/example-filter/filter.cc:62]::onStart() Allocated1: 0

Can somebody please explain this behaviour?