[Dev-luatex] Assertion `pdf_doc->occurences!=0' failed

[Andreas Matthias]

The code shown below triggers the following assertion:

.../source/texk/web2c/luatexdir/image/pdftoepdf.w:844:
   void unrefPdfDocument(char*): Assertion `pdf_doc->occurences!=0' failed.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\directlua{
  local i = 1
  while i < 10000 do
     local pages = img.scan{filename='foo.pdf'}.pages
     print('Run:', i, 'pages:', pages)
     i = i + 1
  end
}
\bye

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


On my side this example runs for about 3000 to 6000 iterations before
triggering this assertion. But with some real code I can trigger it
frequently with less than 200 iterations.


Andreas