When compiling with gcc13.1 for
 When compiling with gcc13.1 for release we get some -Wdangling-pointer warnings like this (earlier versions of gcc don't warn): 

In static member function 'static void MetaspaceCriticalAllocation::add(MetadataAllocationRequest*)',
    inlined from 'MetadataAllocationRequest::MetadataAllocationRequest(ClassLoaderData*, size_t, Metaspace::MetadataType)' at ../../src/hotspot/share/memory/metaspaceCriticalAllocation.cpp:53:37,
    inlined from 'static MetaWordImpl** MetaspaceCriticalAllocation::allocate(ClassLoaderData*, size_t, Metaspace::MetadataType)' at ../../src/hotspot/share/memory/metaspaceCriticalAllocation.cpp:208:65:
../../src/hotspot/share/memory/metaspaceCriticalAllocation.cpp:83:20: warning: storing the address of local variable 'request' in 'MetaspaceCriticalAllocation::_requests_head' [-Wdangling-pointer=]
   83 |     _requests_head = _requests_tail = request;
      |     ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
../../src/hotspot/share/memory/metaspaceCriticalAllocation.cpp: In static member function 'static MetaWordImpl** MetaspaceCriticalAllocation::allocate(ClassLoaderData*, size_t, Metaspace::MetadataType)':
../../src/hotspot/share/memory/metaspaceCriticalAllocation.cpp:208:29: note: 'request' declared here
  208 |   MetadataAllocationRequest request(loader_data, word_size, type);
      |                             ^~~~~~~
../../src/hotspot/share/memory/metaspaceCriticalAllocation.cpp:75:28: note: 'MetaspaceCriticalAllocation::_requests_head' declared here
   75 | MetadataAllocationRequest* MetaspaceCriticalAllocation::_requests_head = nullptr;
      |                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~

Allocating a request (on the stack) adds the request to a global list, and the destructor removes the request from that list.  The warning is a false positive, as the compiler is failing to relate those add/remove pairs.