lilypond hangs

[Werner LEMBERG]

[lilypond 35b7fddf]

I've just downloaded 

  http://www.mutopiaproject.org/ftp/BachJS/BWV1004/bwv-1004_5/bwv-1004_5.ly

applied this patch

  --- BWV-1004_5.orig.ly  2012-01-04 14:17:02.000000000 +0100
  +++ BWV-1004_5.ly       2012-01-04 14:10:15.000000000 +0100
  @@ -1,9 +1,10 @@
  -\version "2.13.10"
  +\version "2.15.20"
 
   \paper {
  -    page-top-space = #0.0
  -    %indent = 0.0
  -    line-width = 18.0\cm
  +    paper-width= 19000\cm
  +    paper-height = 10\cm
  +    line-width = 18000\cm
  +    ragged-right = ##t
       ragged-bottom = ##f
       ragged-last-bottom = ##f
   }

and executed

  lilypond BWV-1004_5.ly

Result: lilypond loops (at least it runs more than 10 minutes without
progress), slowly eating more and more memory.

Without the patch (this is, using normal line widths), it runs just
fine.

Debugging shows that the function System::gen_simple_spacers loops
forever.

Am I just too impatient or is this a real bug?


    Werner