Re: obscure luatex error

[Matthijs Kooijman <matthijs@stdin.nl>]

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Hi,

> luatex: ../../../source/texk/web2c/luatexdir/tex/printing.c:266: print: 
> Assertion `c < 256' failed.
> [329.327MTXrun | fatal error, no return code, message: luatex: execution 
> interrupted

A quick glance at the code, shows it's in the following part:

  /*
  An entire string is output by calling |print|. Note that if we are outputting
  the single standard ASCII character \.c, we could call |print("c")|, since
  |"c"=99| is the number of a single-character string, as explained above. But
  |print_char("c")| is quicker, so \TeX\ goes directly to the |print_char|
  routine when it knows that this is safe. (The present implementation
  assumes that it is always safe to print a visible ASCII character.)
  @^system dependencies@>

  The first 256 entries above the 17th unicode plane are used for a
  special trick: when \TeX\ has to print items in that range, it will
  instead print the character that results from substracting 0x110000
  from that value. This allows byte-oriented output to things like
  \.{\\specials} and \.{\\pdfliterals}. Todo: Perhaps it would be useful
  to do the same substraction while typesetting.
  */

  void print(integer s)
  {                               /* prints string |s| */
  ...
              } else if (s >= 0x110000) {
                  int c = s - 0x110000;
                  assert(c < 256);
                  print_char(c);
              } else {
  ...
  }

It seems the second comment block talks about the code in which the error
occurs. It also seems that this is either caused by some very high unicode
character that's printed, or some invalid (uninitialized?) value is passed to
print().

Do you think you could compile luatex with CFLAGS=-g, and run it in gdb to get
a backtrace? That might help to see where this comes from...

Gr.

Matthijs

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