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ActivityManagerService lock and PowerManagerService.mLock can be acquired in different threads in different orders. registerReceiver() here tries to acquire ActivityManagerService internally while holding mLock. A particular call from WindowManagerService acquires these locks in reverse order. This deadlock can be resolved by moving registerReceiver() to another thread. https://code.google.com/p/android/issues/detail?id=215254 Change-Id: I12cd610e61f212a3fb5e441f2c7a557c90afbda4 Signed-off-by: Shibin George <shibing@codeaurora.org>