title: android camera2 preview data stop callback in the middle of the call
body: <p>My device is: [android camera2 Lollipop] Nexus 5 </p>
  
  <p>I used ImageReader to capture camera2 data. The data callback for a while, but no data later. </p>
  
  <blockquote>
    <p>Log : 
    12-06 05:49:01.406 E/mm-camera(  202): cpp_module_util_handle_frame_drop:510, sending buffer stall, frmid:634, iden:0x20002
    12-06 05:49:01.406 E/mm-camera(  202): cpp_module_util_handle_frame_drop:510, sending buffer stall, frmid:634, iden:0x20003
    12-06 05:49:01.482 E/QCamera3HWI(  189): void qcamera::QCamera3HardwareInterface::handleMetadataWithLock(mm_camera_super_buf_t*): Buffer stall observed reporting error
    12-06 05:49:01.483 E/QCamera3HWI(  189): void qcamera::QCamera3HardwareInterface::handleMetadataWithLock(mm_camera_super_buf_t*): metadata is NULL
    12-06 05:49:01.483 E/CameraDevice-JV-1( 3294): Lost output buffer reported for frame 630
    12-06 05:49:01.483 E/CameraDevice-JV-1( 3294): Lost output buffer reported for frame 630
    12-06 05:49:01.514 I/SQ      ( 3294): PID[3294]TID[3395]:[SQ] INFO: SQCpu -  sq=35 total=54 c</p>
  </blockquote>