backtrace:
#00 pc 00003289 /system/lib/hw/bluetooth.default.so (bt_thread_associate+25)
#01 pc 000015f8 /system/lib/hw/bluetooth.default.so (notification_handler+40)
#02 pc 0000f804 /system/lib/libc.so (__thread_entry+276)
#03 pc 0002999d /system/lib/libc.so
#04 pc 00082ae7 /system/lib/libdvm.so (dvmThreadSelf()+39)
#05 pc 00010db9 /system/lib/libc.so (pthread_mutex_unlock+25)