[tex-live] Re: bug in etex

[Peter Breitenlohner]

On Tue, 13 Jul 2004, Taco Hoekwater wrote:

> I've been working on this for quite a few hours now, and there really is a bug
> somewhere in the (web2c version of) the etex code. The following extended
> mode plain input file causes both of pdfetex and etex (Web2c 7.5.3 and 7.4.5)
> to quit with SIGSEGV under linux:
>
> ------
>  \toksdef\whatevertoks = 266
>  \toksdef\extratoks = 267
>  \whatevertoks={junk}
>  \everypar{\extratoks=\whatevertoks}
>  \immediate\write16{t={\the\toks265}}
>  some paragraph\par
>  \bye
> -------
>
> It seems that the '\the' command that accesses a previously undefined token
> register is what is causing the problem later on; the SIGSEGV happens when
> TeX tries to access the RHS of the \extratoks=\whatevertoks assignment.

Hi Taco,

I have just reproduced the SIGSEGV with
 	"This is e-TeX, Version 3.14159-2.1 (Web2C 7.3.1)"
(yes we still use this somewhat oldish version).
I'll have to look into the code to find out what goes wrong.

--------------------------

Could any one test this on a non-linux Unix system and report the outcome?

regards
Peter Breitenlohner <peb at mppmu.mpg.de>