The input stream thread cashes when closing the inputstream QThread. In particular this seems to happen when the device turns display off.
It seems any blocking java call in a QThread does not reliably wake up. A simialr behavior was seen in QTBUG-36754.

Crash log:

D/Qt (17749): ../bttestui/btlocaldevice.cpp:397 (void BtLocalDevice::socketError(QBluetoothSocket::SocketError)): ###### Socket error QBluetoothSocket::NetworkError "Network error during read"
D/Qt (17749): ../bttestui/btlocaldevice.cpp:402 (void BtLocalDevice::socketStateChanged(QBluetoothSocket::SocketState)): ###### Socket state QBluetoothSocket::UnconnectedState
D/Qt (17749): ../bttestui/btlocaldevice.cpp:572 (void BtLocalDevice::clientSocketDisconnected()): ###### Removing server socket connection
W/dalvikvm(17749): Invalid indirect reference 0x79545d78 in decodeIndirectRef
I/dalvikvm(17749): "Thread-323" prio=5 tid=15 RUNNABLE
I/dalvikvm(17749): | group="main" sCount=0 dsCount=0 obj=0x41e77758 self=0x7953fc78
I/dalvikvm(17749): | sysTid=18169 nice=0 sched=0/0 cgrp=apps handle=2035546672
I/dalvikvm(17749): | state=R schedstat=( 0 0 0 ) utm=0 stm=0 core=0
I/dalvikvm(17749): at dalvik.system.NativeStart.run(Native Method)
I/dalvikvm(17749):
E/dalvikvm(17749): VM aborting