Emitting signal from different thread causes QML to crash

********* Start testing of qmlbug *********
Config: Using QTest library 5.0.0, Qt 5.0.0
PASS   : qmlbug::initTestCase()
[New Thread 0xb32b1b70 (LWP 25389)]
[New Thread 0xb2ab0b70 (LWP 25390)]
[New Thread 0xb2a9ab70 (LWP 25391)]


#
# Fatal error in ../3rdparty/v8/src/isolate.h, line 443
# CHECK(isolate != __null) failed
#


Program received signal SIGTRAP, Trace/breakpoint trap.
[Switching to Thread 0xb2a9ab70 (LWP 25391)]
v8::internal::OS::DebugBreak () at ../3rdparty/v8/src/platform-linux.cc:389
389     }
(gdb) bt
#0  v8::internal::OS::DebugBreak () at ../3rdparty/v8/src/platform-linux.cc:389
#1  0xb76baf9c in v8::internal::OS::Abort () at ../3rdparty/v8/src/platform-linux.cc:371
#2  0xb735f5e8 in V8_Fatal (file=0xb76c9db2 "../3rdparty/v8/src/isolate.h", line=443, format=0xb76c9c87 "CHECK(%s) failed") at ../3rdparty/v8/src/checks.cc:58
#3  0xb72fcc1e in v8::internal::Isolate::Current () at ../3rdparty/v8/src/isolate.h:443
#4  0xb735f5db in V8_Fatal (file=0xb76c9db2 "../3rdparty/v8/src/isolate.h", line=443, format=0xb76c9c87 "CHECK(%s) failed") at ../3rdparty/v8/src/checks.cc:55
#5  0xb72fcc1e in v8::internal::Isolate::Current () at ../3rdparty/v8/src/isolate.h:443
#6  0xb735f5db in V8_Fatal (file=0xb76c9db2 "../3rdparty/v8/src/isolate.h", line=443, format=0xb76c9c87 "CHECK(%s) failed") at ../3rdparty/v8/src/checks.cc:55
#7  0xb72fcc1e in v8::internal::Isolate::Current () at ../3rdparty/v8/src/isolate.h:443
#8  0xb7302db7 in v8::HandleScope::HandleScope (this=0xb2a9a01c) at ../3rdparty/v8/src/api.cc:675
#9  0xb7990472 in QQmlBoundSignalExpression::evaluate (this=0x8102b20, secondaryScope=0x81117e0) at qml/qqmlboundsignal.cpp:124
#10 0xb7990f8a in QQmlBoundSignal::subscriptionCallback (e=0x8101c3c, a=0xb2a9a228) at qml/qqmlboundsignal.cpp:305
#11 0xb79d90c5 in QQmlNotifier::emitNotify (endpoint=0x8101c3c, a=0xb2a9a228) at qml/qqmlnotifier.cpp:60
#12 0xb793323b in QQmlData::signalEmitted (object=0x81028d8, index=5, a=0xb2a9a228) at qml/qqmlengine.cpp:449
#13 0xb695f9da in QMetaObject::activate (sender=0x81028d8, m=0x8051c00, local_signal_index=0, argv=0xb2a9a228) at kernel/qobject.cpp:3326
#14 0x0804c236 in MyWorkerObject::done (this=0x81028d8, _t1=...) at main.moc:128
#15 0x0804bc00 in MyWorkerObject::reallyDoIt (this=0x81028d8) at main.cpp:26
#16 0x0804e5ba in QtConcurrent::VoidStoredMemberFunctionPointerCall0<void, MyWorkerObject>::runFunctor (this=0x80f6780)
    at ../qtbase/include/QtConcurrent/../../src/concurrent/qtconcurrentstoredfunctioncall.h:208
#17 0x0804ce25 in QtConcurrent::RunFunctionTask<void>::run (this=0x80f6780) at ../qtbase/include/QtConcurrent/../../src/concurrent/qtconcurrentrunbase.h:133
#18 0xb677fa21 in QThreadPoolThread::run (this=0x8102a28) at thread/qthreadpool.cpp:98
#19 0xb6784a18 in QThreadPrivate::start (arg=0x8102a28) at thread/qthread_unix.cpp:319
#20 0xb662ce99 in start_thread (arg=0xb2a9ab70) at pthread_create.c:304
#21 0xb646873e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130