开发一个COM组件在Windows 7上注册成功，但是Windows XP SP3版本却导致regsvr32.exe进程挂起。用WinDbg查看发现提示：
Break-in sent, waiting 30 seconds... WARNING: Break-in timed out, suspending. This is usually caused by another thread holding the loader lock
竟然出现了加载锁，kb查看call stack：
0:000> kb ChildEBP RetAddr Args to Child 0007dc00 7c92df3c 7c9546b0 000006e0 00000000 ntdll!KiFastSystemCallRet 0007dc04 7c9546b0 000006e0 00000000 00000000 ntdll!NtWaitForSingleObject+0xc 0007dc30 7c94dbde 7c885854 00000000 0007dc60 ntdll!RtlpInitializeTimerThreadPool+0xe1 0007dc40 7c82cbd2 7c885770 0007dd68 000c9184 ntdll!RtlCreateTimerQueue+0x3b 0007dc60 7c82cbed 0007dc90 0007dd68 00cd7ebd kernel32!BasepCreateDefaultTimerQueue+0x66 0007dc6c 00cd7ebd 000c9184 00000000 00c8b1c1 kernel32!CreateTimerQueueTimer+0x20
组件加载以后会调用Windows API CreateTimerQueueTimer创建一个Timer，regsvr32就是被这段代码给挂住了。
if (m_hTimer != nullptr) return; SetCount(0); ::CreateTimerQueueTimer(&m_hTimer, NULL, OnTimer, this, 0, m_interval, WT_EXECUTEINTIMERTHREAD);
CreateTimerQueueTimer在DllMain中调用导致的loader lock,布布扣,bubuko.com
CreateTimerQueueTimer在DllMain中调用导致的loader lock
原文：http://www.cnblogs.com/junchu25/p/3614619.html