0bd28e2c5f7fd7e4448ae489b425e4e5cee57f9a
Symptom: System crash by NPE is observed on ActivityStarter during phone boot-up. Detail and sample: ActivityStarter has possibility to be called itself recursively by calling TaskRecord$performClearTaskLocked(). Then class variable of mReusedTask is initialized to null after the call, because the recursive call isn't guarded by synchronized block. Then NPE crash occurs on next statement. Solutions: Avoid to use the class variable on null possibility statement. Bug: 32361138 Change-Id: Iaea3e066a6f7134fcae4338ff864bb236241194c
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