Hi, AWT & HotSpot teams,
I've just experienced a problem with a simple test - see the attached
file. The test shows a file dialog and then hangs when the dialog is
being disposed. I tried to get a stack trace... and failed, both with
jstack and ctrl+break from the console.
When I attached to the process with Visual Studio, I noticed several
suspicious threads:
1. One of the threads with AWT code waits for safe_Malloc() to return,
which in turn waits for JVM code in Monitor::set_owner_implementation():
ntdll.dll!_zwwaitforsingleobj...@12()
ntdll.dll!_zwwaitforsingleobj...@12()
jvm.dll!Monitor::set_owner_implementation(Thread *
new_owner=0x00000000) Line 1307
ntdll.dll!_rtlentercriticalsect...@4()
ntdll.d...@rtlpallocateheap@24()
ntdll.dll!_rtlallocateh...@12()
msvcr90.dll!75293db8()
[Frames below may be incorrect and/or missing, no symbols loaded for
msvcr90.dll]
awt.dll!safe_Malloc(unsigned int size=6) Line 85
awt.dll!CreateLocaleObject(JNIEnv_ * env=0x04601d34, const char *
name=0x002a1e58) Line 539
awt.dll!Java_sun_awt_windows_WInputMethod_getNativeLocale(JNIEnv_ *
env=0x04601d34, _jclass * cls=0x065bf728) Line 299
2. Another thread is in os::free():
ntdll.dll!_zwwaitforsingleobj...@12()
ntdll.dll!_zwwaitforsingleobj...@12()
kernelbase.dll!_getprocaddr...@8()
ntdll.dll!_rtlentercriticalsect...@4()
ntdll.d...@rtlpfreeheap@16()
ntdll.dll!_rtlfreeh...@12()
kernel32.dll!_heapf...@12()
msvcr90.dll!75293c1b()
[Frames below may be incorrect and/or missing, no symbols loaded for
msvcr90.dll]
jvm.dll!os::free(void * memblock=0x01f64d50) Line 602
jvm.dll!ChunkPool::free_all_but(unsigned int n=5) Line 152
jvm.dll!ChunkPoolCleaner::task() Line 195
jvm.dll!PeriodicTask::real_time_tick(unsigned int delay_time=50) Line 60
jvm.dll!WatcherThread::run() Line 1086
jvm.dll!java_start(Thread * thread=0x01f5c800) Line 377
3. One more thread waiting for a memory-related operation - I suspect
it's the thread that should provide the stack trace:
ntdll.dll!_zwwaitforsingleobj...@12()
ntdll.dll!_zwwaitforsingleobj...@12()
jvm.dll!InterfaceSupport::serialize_memory(JavaThread *
thread=0x00000148) Line 37
kernel32.dll!_waitforsingleobjecteximplementat...@12()
kernel32.dll!_waitforsingleobj...@8()
jvm.dll!Win32AttachListener::dequeue() Line 233
jvm.dll!AttachListener::dequeue() Line 353
jvm.dll!attach_listener_thread_entry(JavaThread * thread=0x01f4d800,
Thread * __the_thread__=0x01f4d800) Line 376
jvm.dll!JavaThread::thread_main_inner() Line 1402
jvm.dll!java_start(Thread * thread=0x01f4d800) Line 377
Any ideas about what's going? The hang only occurs if I build JDK and
HotSpot using VS2008 - exactly the same JDK7-b99 promoted build (which
is built with VS2003) works fine. If I change the file dialog with a
regular AWT modal dialog, the problem goes away as well.
Thanks,
Artem
import java.awt.*;
public class Test {
public static void main(String[] args) throws Exception {
final Frame f = new Frame("F");
final FileDialog fd = new FileDialog(f);
// final Dialog fd = new Dialog(f, true);
new Thread(new Runnable() {
public void run() {
fd.setVisible(true);
}
}).start();
Thread.sleep(3000);
System.err.println("before dispose");
System.err.flush();
fd.dispose();
System.err.println("after dispose");
System.err.flush();
new Thread(new Runnable() {
public void run() {
System.err.println("run");
System.err.flush();
}
}).start();
System.err.println("thread started");
System.err.flush();
f.dispose();
}
}
