How to correctly load/unload textures from video memory?

I have a Java OpenGL application - backed by JOGL, running on Linux slitaz 3.2.53-slitaz #4 SMP Europe 2014 i686 GNU/Linux.

OpenGL details:

• Vendor: Intel Open Source Technology Center
• Renderer: Mesa DRI
• Intel(R) Ivybridge Mobile x86/MMX/SSE2
• Version: 2.1 Mesa 9.1.3 GL
• Profile: GLProfile[GL2/GL2.hw]

When running loading & deleting textures on the GPU, it crashes after a certain amount of time - proportional to the frequency of loads & unloads, more loads crash sooner etc.

The error given: intel_do_flush_locked failed: No space left on device

In this case I'm:

• Creating a frame buffer, glGenFramebuffers..
• Creating a backing texture, glGenTextures.. glFramebufferTexture2D..
• Binding & drawing into this off-screen frame buffer..
• Deleting the buffer, glDeleteFramebuffers
• Keeping the texture to draw to screen for a few frames
• Deleting the texture, glDeleteTextures

After searching around, I've found sources suggesting that glDeleteTextures doesn't guarantee the free-ing of the VRAM used by the texture, just the ID returned by glGenTextures so it can be reused. For example: https://gamedev.stackexchange.com/questions/63629/how-to-deallocate-release-delete-of-a-gltexstorage2d

But I've also found articles reporting potential/bugs in the Mesa driver & versions of Lunix that report the same exception: intel_do_flush_locked failed: No space left on device

In conclusion I'm asking:

1. Am I correctly using the OpenGL commands to load & delete textures?
2. Has anyone else had problems with this error & found it to be device/distro related?

The problem was indeed as Reto Koradi suggested in the comments via his answer to OpenGL es 1.1 - android - does gl.glDeleteTextures free video memory? whereby not detaching textures & render buffers from frame buffers before deletion was keeping them in memory.

To anyone else who is creating off screen frame buffers with textures &/or render buffers, make sure you detach them first! E.g:

• glBindFramebuffer( GL2ES2.GL_FRAMEBUFFER, theFrameBufferID);
• glFramebufferTexture2D( GL2ES2.GL_FRAMEBUFFER, GL2ES2.GL_COLOR_ATTACHMENT0, GL2ES2.GL_TEXTURE_2D, 0, 0);
• glFramebufferRenderbuffer( GL2ES2.GL_FRAMEBUFFER, GL2ES2.GL_STENCIL_ATTACHMENT, GL2ES2.GL_RENDERBUFFER, 0);
• glDeleteFramebuffers.. theFrameBufferID..
• glDeleteTextures..
• glDeleteRenderbuffers..
• glBindFramebuffer( GL2ES2.GL_FRAMEBUFFER, 0);