Segfault on shutdown during testing

node(70778,0x104aaae00) malloc: *** error for object 0x104f38c38: pointer being freed was not allocated

node(70778,0x104aaae00) malloc: *** set a breakpoint in malloc_error_break to debug

Process 70778 stopped

* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1

    frame #0: 0x00007fff2019da65 libsystem_malloc.dylib`malloc_error_break

libsystem_malloc.dylib`malloc_error_break:

->  0x7fff2019da65 <+0>: pushq  %rbp

    0x7fff2019da66 <+1>: movq   %rsp, %rbp

    0x7fff2019da69 <+4>: nop

    0x7fff2019da6a <+5>: nopl   (%rax)

Target 0: (node) stopped.

(lldb) bt

* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1

  * frame #0: 0x00007fff2019da65 libsystem_malloc.dylib`malloc_error_break

    frame #1: 0x00007fff20191219 libsystem_malloc.dylib`malloc_vreport + 440

    frame #2: 0x00007fff2019435a libsystem_malloc.dylib`malloc_report + 151

    frame #3: 0x0000000100461e6e node`v8::internal::MemoryChunk::ReleaseAllocatedMemoryNeededForWritableChunk() + 270

    frame #4: 0x000000010045e5a6 node`void v8::internal::MemoryAllocator::Free<(v8::internal::MemoryAllocator::FreeMode)0>(v8::internal::MemoryChunk*) + 22

    frame #5: 0x0000000100471ebf node`v8::internal::PagedSpace::TearDown() + 79

    frame #6: 0x00000001003fe9fd node`v8::internal::PagedSpace::~PagedSpace() + 29

    frame #7: 0x00000001003fe93e node`v8::internal::OldSpace::~OldSpace() + 14

    frame #8: 0x00000001003f71bf node`v8::internal::Heap::TearDown() + 1279

    frame #9: 0x000000010038a119 node`v8::internal::Isolate::Deinit() + 969

    frame #10: 0x0000000100389ccd node`v8::internal::Isolate::Delete(v8::internal::Isolate*) + 77

    frame #11: 0x00000001000fe85d node`node::NodeMainInstance::~NodeMainInstance() + 45

    frame #12: 0x000000010009196f node`node::Start(int, char**) + 271

    frame #13: 0x00007fff20377f3d libdyld.dylib`start + 1

(lldb)