Started seeing this today. I did make a change to the type of dialog that print preview uses yesterday, but I'm not seeing the issue on other instances of the same type of dialog (e.g. extension install). For reference: https://codereview.chromium.org/1699763002/

I'm not familiar with v8; hopefully the following is helpful.

Local HEAD @ f500dbd509e03b381884c005bc645a9d2c7c8a6f

Repro Steps:
1. Open browser.
2. Navigate to some page (e.g. google.com).
3. Ctrl+P to open Print Preview.
4. Observe the following:

#
# Fatal error in ../../v8/src/api.cc, line 166
# Check failed: handle_scope_implementer->GetMicrotasksScopeDepth() || !handle_scope_implementer->DebugMicrotasksScopeDepthIsZero().
#

==== C stack trace ===============================

 1: V8_Fatal
 2: v8::(anonymous namespace)::CallDepthScope::~CallDepthScope()
 3: v8::Function::Call(v8::Local<v8::Context>, v8::Local<v8::Value>, int, v8::Local<v8::Value>*)
 4: extensions::v8_helpers::CallFunction(v8::Local<v8::Context>, v8::Local<v8::Function>, v8::Local<v8::Value>, int, v8::Local<v8::Value>*, v8::Local<v8::Value>*)
 5: extensions::BindingGeneratingNativeHandler::NewInstance()
 6: extensions::ModuleSystem::RequireNativeFromString(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)
 7: extensions::ModuleSystem::LazyFieldGetterInner(v8::Local<v8::String>, v8::PropertyCallbackInfo<v8::Value> const&, v8::MaybeLocal<v8::Object> (extensions::ModuleSystem::*)(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&))
 8: extensions::ModuleSystem::NativeLazyFieldGetter(v8::Local<v8::Name>, v8::PropertyCallbackInfo<v8::Value> const&)
 9: v8::internal::PropertyCallbackArguments::Call(void (*)(v8::Local<v8::Name>, v8::PropertyCallbackInfo<v8::Value> const&), v8::Local<v8::Name>)
10: v8::internal::Object::GetPropertyWithAccessor(v8::internal::LookupIterator*)
11: v8::internal::Object::GetProperty(v8::internal::LookupIterator*)
12: v8::internal::LoadIC::Load(v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Name>)
13: v8::internal::Runtime_LoadIC_Miss(int, v8::internal::Object**, v8::internal::Isolate*)
14: 0x16230b15b
Received signal 4 <unknown> 000145878d5c
 [0x00011f30d7ff]
 [0x00011f30db03]
 [0x00011f30d6d3]
 [0x7fff921bceaa]
 [0x7fff5f83edd0]
 [0x00014586ea1c]
 [0x000143fe4736]
 [0x00014403e6c0]
 [0x000112c49cbe]
 [0x000112c480c3]
 [0x000112e61a82]
 [0x000112e5caa2]
 [0x000112e5a857]
 [0x0001440bd3af]
 [0x000144e785f2]
 [0x000144e744d4]
 [0x000144cd373f]
 [0x000144cf03e5]
 [0x00016230b15b]
[end of stack trace]