crash log for renderer (pid 28962):
STDOUT: #CRASHED - renderer (pid 28962)
STDERR: ASSERTION FAILED: strcmp(type->interfaceName, "NPObject") || !scriptwrappable->hasPendingActivity()
STDERR: ../../third_party/WebKit/Source/bindings/core/v8/V8GCController.cpp(282) : virtual void blink::MajorGCWrapperVisitor::VisitPersistentHandle(v8::Persistent<v8::Value> *, uint16_t)
STDERR: 1   0x109fd1f7a v8::VisitorAdapter::VisitEmbedderReference(v8::internal::Object**, unsigned short)
STDERR: 2   0x10a199c3f v8::internal::GlobalHandles::IterateAllRootsWithClassIds(v8::internal::ObjectVisitor*)
STDERR: 3   0x109fc7cbe v8::Isolate::VisitHandlesWithClassIds(v8::PersistentHandleVisitor*)
STDERR: 4   0x10b5cf365 blink::(anonymous namespace)::gcPrologueForMajorGC(v8::Isolate*, bool)
STDERR: 5   0x10b5cf0c4 blink::V8GCController::gcPrologue(v8::GCType, v8::GCCallbackFlags)
STDERR: 6   0x10a1a68a9 v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags)
STDERR: 7   0x10a1a60c9 v8::internal::Heap::CollectGarbage(v8::internal::GarbageCollector, char const*, char const*, v8::GCCallbackFlags)
STDERR: 8   0x10a1a5666 v8::internal::Heap::CollectAllGarbage(int, char const*, v8::GCCallbackFlags)
STDERR: 9   0x108c612b3 content::GCController::CollectAll(gin::Arguments const&)
STDERR: 10  0x108c61512 gin::internal::Dispatcher<void (content::GCController*, gin::Arguments const&)>::DispatchToCallback(v8::FunctionCallbackInfo<v8::Value> const&)
STDERR: 11  0x109fdf34c v8::internal::FunctionCallbackArguments::Call(void (*)(v8::FunctionCallbackInfo<v8::Value> const&))
STDERR: 12  0x10a005955 v8::internal::MaybeHandle<v8::internal::Object> v8::internal::HandleApiCallHelper<false>(v8::internal::Isolate*, v8::internal::(anonymous namespace)::BuiltinArguments<(v8::internal::BuiltinExtraArguments)1>&)
STDERR: 13  0x10a008b54 v8::internal::Builtin_HandleApiCall(int, v8::internal::Object**, v8::internal::Isolate*)
STDERR: 14  0x646be90895b
STDERR: Received signal 11 SEGV_MAPERR 0000fbadbeef
STDERR:  [0x000108d895ca]
STDERR:  [0x7fff8edf95aa]
STDERR:  [0x2f656372756f532f]
STDERR:  [0x000109fd1f7a]
STDERR:  [0x00010a199c3f]
STDERR:  [0x000109fc7cbe]
STDERR:  [0x00010b5cf365]
STDERR:  [0x00010b5cf0c4]
STDERR:  [0x00010a1a68a9]
STDERR:  [0x00010a1a60c9]
STDERR:  [0x00010a1a5666]
STDERR:  [0x000108c612b3]
STDERR:  [0x000108c61512]
STDERR:  [0x000109fdf34c]
STDERR:  [0x00010a005955]
STDERR:  [0x00010a008b54]
STDERR:  [0x0646be90895b]
STDERR: [end of stack trace]