Gc collects trigger access violation exception

[mashomee via Digitalmars-d-learn]

Hi, everyone.

I have a thread running in Dll. But it always halts because of 
access violation exception when GC begins collecting.

This is the thread stack frame in vs2013.

testSendSms.exe!_D4core6thread6Thread9isRunningMFNbNdZb() + 0x1 
bytes	D
testSendSms.exe!_D2gc4impl12conservative2gc3Gcx10smallAllocMFNbhKkkZPv() + 
0x2a6 bytes  D  
testSendSms.exe!_D2gc4impl12conservative2gc14ConservativeGC6qallocMFNbkkxC8TypeInfoZS4core6memory8BlkInfo_()
 + 0x6d bytes    D

then found these in core.thread.d

private bool suspend( Thread t ) nothrow
{
    .........

    version( Windows )
    {
        if( t.m_addr != GetCurrentThreadId() && SuspendThread( 
t.m_hndl ) == 0xFFFFFFFF )
        {
            if( !t.isRunning )
            {
                Thread.remove( t );
                return false;
            }
            onThreadError( "Unable to suspend thread" );
        }
    .......
    }
    ........
 }
I think the problem is when GC detects if the threading is 
runnig, using core.thread.isRunning, the thread pointer is null.

When dll is loaded, it calls  Runtime.initialize(), 
gc_setProxy(gc) as the wiki says, so I have no idea why this 
happened, and how to fix it. Could someone give me a hint ?

Thanks!