[Bug 107579] [SNB] The graphic corruption when we reuse the GS compiled and used for TFB when statebuffer contain magic trash in the unused space

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107579

--- Comment #7 from asimiklit <andrey.simiklit at gmail.com> ---
Created attachment 141137
  --> https://bugs.freedesktop.org/attachment.cgi?id=141137&action=edit
simple program and makefile

Added simple reproducer program

Note: I was a bit wrong the magic value 0xFFFFFFFF is enough for HANG only for
the graphical corruption we need the following values:

((uint32_t*)vbuffer0Ptr)[0] =  0x2003625aU;
((uint32_t*)vbuffer0Ptr)[1] =  0x02040110U;
((uint32_t*)vbuffer0Ptr)[2] =  0x2027625aU;
((uint32_t*)vbuffer0Ptr)[3] =  0x02040210U;

They are used in the following function:
>bool allocBufferWithMagicTrash(GLuint idx)
>{
>   bool oval = false;
>   enum { kSize = 16384 };
>   glBindBuffer(GL_ARRAY_BUFFER, idx);
>   glBufferData(GL_ARRAY_BUFFER, kSize, NULL, GL_STATIC_DRAW);
>   void * vbuffer0Ptr = glMapBuffer(GL_ARRAY_BUFFER, GL_READ_WRITE);
>   assert(vbuffer0Ptr);
>   if(vbuffer0Ptr)
>   {
>      memset(vbuffer0Ptr, 0xFF, kSize);
>      ((uint32_t*)vbuffer0Ptr)[0] =  0x2003625aU;
>      ((uint32_t*)vbuffer0Ptr)[1] =  0x02040110U;
>      ((uint32_t*)vbuffer0Ptr)[2] =  0x2027625aU;
>      ((uint32_t*)vbuffer0Ptr)[3] =  0x02040210U;
>      glUnmapBuffer(GL_ARRAY_BUFFER);
>      glBindBuffer(GL_ARRAY_BUFFER, 0);
>   }
>   return oval;
>}

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