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It is not clear to me how to reproduce the bug.
When you say "letting the workers terminate themselves" do mean calling sys.exit() or os._exit() in the submitted task? Are you trying to get the result of a task which caused the worker to exit?
I'm not sure how the patch would change the current behaviour.
The following seems to work for me:
import sys, os
import multiprocessing as mp
if __name__ == '__main__':
 p = mp.Pool(4, maxtasksperchild=5)
 results = []
 for i in range(100):
 if i % 10 == 0:
 results.append(p.apply_async(sys.exit))
 else:
 results.append(p.apply_async(os.getpid))
 for i, res in enumerate(results):
 if i % 10 != 0:
 print(res.get())
 else:
 pass # trying res.get() would block forever