[Python] Tkinter locks Python when an icon is loaded and tk.mainloop is in a thread

Here's the test case...

import Tkinter as tk
import thread
from time import sleep

if __name__ == '__main__':
t = tk.Tk()
thread.start_new_thread(t.mainloop, ())
# t.iconbitmap('icon.ico')

b = tk.Button(text='test', command=exit)
b.grid(row=0)

while 1:
sleep(1)


This code works. Uncomment the t.iconbitmap line and it locks. Re-arrange it any way you like; it will lock.

How do I prevent tk.mainloop locking the GIL when there is an icon present?

The target is win32 and Python 2.6.2.

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