White screen Flicker for rendering image

Hello,

This is first time posting here, Am new to the openGL. Am trying to display the camera content with fish Eye correction(using fragment shader) . Its work fine but some times white flicker occurred on complete screen and below error code occurred during flicker.

NCGSYS_FrameMemAlloc : AllocateAnyMemoryRegion (Kernel) failed - 138.

from shared memory get the camera data and process as below


glGenTextures(1, &textureID);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1024, 600, 0, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*)buf);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); // Linear Filtering
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); // Linear Filtering    

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,     GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,     GL_CLAMP_TO_EDGE);

glVertexAttribPointer ( positionLoc, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), vVertices );
glVertexAttribPointer ( texCoordLoc, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), &vVertices[3] );            

glEnableVertexAttribArray ( positionLoc );
glEnableVertexAttribArray ( texCoordLoc );
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glClearColor(0.0, 0.0, 0.0, 1.0);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D,textureID);
glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices );

Call eglSwapBuffers().

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