android - Error: "Fatal signal 11 (SIGSEGV), code 1" when passing Mat object from java to jni function -

i running video camera using opencv function. pass mat object jni function works awhile, them error:

10-10 13:03:17.978: a/libc(28693): fatal signal 11 (sigsegv), code 1, fault addr 0x9 in tid 28791 (thread-5418) 

java code runs camera , calls jni function:

package com.adhamenaya;  import java.util.arraylist;  import org.opencv.android.baseloadercallback; import org.opencv.android.camerabridgeviewbase; import org.opencv.android.camerabridgeviewbase.cvcameraviewframe; import org.opencv.android.camerabridgeviewbase.cvcameraviewlistener2; import org.opencv.android.loadercallbackinterface; import org.opencv.android.opencvloader; import org.opencv.core.mat; //import org.opencv.highgui.highgui; import org.opencv.imgproc.imgproc;  import android.app.activity; import android.os.bundle; import android.os.handler; import android.util.log; import android.view.motionevent; import android.view.surfaceview; import android.view.view; import android.view.view.ontouchlistener; import android.view.windowmanager;  public class mainactivity extends activity implements cvcameraviewlistener2,         ontouchlistener {      private static final string tag = "ocvsample::activity";     private mat mrgba;     private mat mgray;     private camerabridgeviewbase mopencvcameraview;      private arraylist<mat> mats = new arraylist<mat>();      private baseloadercallback mloadercallback = new baseloadercallback(this) {         @override         public void onmanagerconnected(int status) {             switch (status) {             case loadercallbackinterface.success: {                 log.i(tag, "opencv loaded successfully");                 mopencvcameraview.enableview();                 mopencvcameraview.setontouchlistener(mainactivity.this);              }                 break;             default: {                 super.onmanagerconnected(status);             }                 break;             }         }     };      public mainactivity() {         log.i(tag, "instantiated new " + this.getclass());     }      @override     protected void oncreate(bundle savedinstancestate) {         log.i(tag, "called oncreate");         super.oncreate(savedinstancestate);          native.loadlibs();           mopencvcameraview = (camerabridgeviewbase) findviewbyid(r.id.cam_view);         mopencvcameraview.setvisibility(surfaceview.visible);         mopencvcameraview.setcvcameraviewlistener(this);          native.setup(mfacecascadefile, mnosecascadefile, mlandmarks);     }      @override     public void onpause() {         super.onpause();         if (mopencvcameraview != null)             mopencvcameraview.disableview();     }      @override     public void onresume() {         super.onresume();         opencvloader.initasync(opencvloader.opencv_version_2_4_3, this,                 mloadercallback);     }      public void ondestroy() {         super.ondestroy();         if (mopencvcameraview != null)             mopencvcameraview.disableview();     }      public void oncameraviewstarted(int width, int height) {         mgray = new mat();         mrgba = new mat();     }      public void oncameraviewstopped() {     }      public mat oncameraframe(cvcameraviewframe inputframe) {         mrgba = inputframe.rgba();         imgproc.cvtcolor(mrgba, mgray, imgproc.color_bgra2gray);         native.runjni(mfacecascadefile, mnosecascadefile, mlandmarks,                 mrgba.getnativeobjaddr());          return mrgba;     }      @override     public boolean ontouch(view v, motionevent event) {         // todo auto-generated method stub         return false;     }   } 

jni function:

jniexport jbytearray jnicall java_com_adhamenaya_native_runjni(jnienv * env,         jobject obj, jstring facecascadefile, jstring nosecascadefile,         jstring landmarks, jlong frame) {      cv::mat& inframe = *(cv::mat*) frame;      if (!gsys.loadfacecascade(facecascadefnamestr)) {         log("could not load face cascade");         gsys.loadfacecascade(facecascadefnamestr);     } else {         log("face cascade: ok");      }      if (!gsys.loadnosecascade(nosecascadefnamestr)) {         log("could not load nose cascade");         gsys.loadnosecascade(nosecascadefnamestr);      } else {         log("nose cascade: ok");      }      gsys.setframerate(30);     gsys.setprogramstate(detect);      clock_t tin, tout = 0;      cv::flip(inframe, inframe, 0);     cv::transpose(inframe, inframe);      dlib::shape_predictor pose_model;     dlib::deserialize(landmarksstr) >> pose_model;        gsys.setcurrentframe(inframe);       tin = clock();      trigger_hr(gsys, faces, pose_model);       // process frame      size_t spm;      float motionstrengthx, motionstrengthy;      float phiyaw = -0xffffffff, thetapitch = -0xffffffff;       if (faces.size()) {      faces[0].getspm(gsys, spm, motionstrengthx, motionstrengthy);      faces[0].getfacepose(phiyaw, thetapitch);      }       tout = tout + clock() - tin;      if ((gsys.getframecount() % 30) == 29) {      double secs_between_frames = (double) (tout) / (clocks_per_sec * 30.0f);      printf("fps = %2.2f\n", 1.0f / secs_between_frames);      log("fps = %2.2f ", 1.0f / secs_between_frames);      tout = 0;      }       char spmtext[100];       //sprintf(spmtext,      //     "spm = %zu, p = %2.2f, t = %2.2f, ms-x = %2.2f, ms-y = %2.2f", spm,      //     phiyaw, thetapitch, motionstrengthx, motionstrengthy);       log("spm = %zu, p = %2.2f, t = %2.2f, ms-x = %2.2f, ms-y = %2.2f", spm,      phiyaw, thetapitch, motionstrengthx, motionstrengthy);      std::string str;     str = "spm=";      jbytearray arr = env->newbytearray(str.length());     env->setbytearrayregion(arr, 0, str.length(), (jbyte*) str.c_str());      return arr;  } 

kindly me.

after 2 days of searching online, figure out problem because of 'memory leak', , happens when reading frames video , send them jni function, without releasing frames after finishing working on them, have frames in memory.

what did move mat object in c++ code outside scope of function , make class scope object, not create new object each time function called.

also, called:

inframe.release(); 

to free memory after finishing working on it.