.NET线程如何等待不属于任何线程的syncblk？

I have a crash dump from my app showing a bunch of threads waiting on a syncblk, and the syncblk shows that it has no owning thread. How is that possible? I'm trying to reproduce the symptom in a test app, and I can't figure out what could possibly happen to produce that result....having the owning thread exit or die without releasing the syncblk still shows up as owning the object, just the threadid is "XXX"....I've tested using fully managed graceful exit and hard thread termination via pinvoke....I tested a bunch of different combinations of waits without pulses, mismatched enters and exits...nothing produces a syncblk which blocks threads and shows no owner.....I'm running out of ideasI have a crash dump from my app showing a bunch