[luatex] segfault lualatx in math_fraction (), texlive 2016, lualatex 0.95

[luigi scarso]

On Sun, Jan 1, 2017 at 7:09 PM, Kazuki Maeda <kmaeda at kmaeda.net> wrote:
> Hello.
>
>> Here is what I found: I delete the .aux and .toc files, then
>> compile using
>>          lualatex KERNEL.tex
>> first time, ok, next time
>>          lualatex KERNEL.tex
>> gives seg fault:
>
> I tried on my Gentoo Linux (x86_64) machine with TeX Live 2016,
> then the SEGV was reproduced.
> The latest LuaTeX 1.0.1 (rev 6160 built with --debug) also caused the SEGV.
>
>
> (... first time compile ...)
> Output written on KERNEL.pdf (915 pages, 4605143 bytes).
> Transcript written on KERNEL.log.
> [Inferior 1 (process 4713) exited normally]
> (gdb) r KERNEL.tex
> Starting program: /usr/local/texlive/2016/bin/x86_64-linux/lualatex KERNEL.tex
> This is LuaTeX, Version 1.0.1 (TeX Live 2017/dev)
>  restricted system commands enabled.
> (./KERNEL.tex
> ...
> [372]
> Underfull \hbox (badness 10000) in paragraph at lines 25143--25144
>
>
> Underfull \hbox (badness 10000) in paragraph at lines 25148--25150
>
>
> Underfull \hbox (badness 10000) in paragraph at lines 25151--25152
>
>
> Underfull \hbox (badness 10000) in paragraph at lines 25157--25158
>
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x000000000050001e in math_fraction () at ../../../source/texk/web2c/luatexdir/tex/texmath.w:1798
> 1798            numerator(incompleat_noad_par) = new_node(sub_mlist_node, 0);
> (gdb) l
> 1793            if ((c % delimited_code) == above_code)
> 1794                scan_normal_dimen();
> 1795            tex_error("Ambiguous; you need another { and }", hlp);
> 1796        } else {
> 1797            incompleat_noad_par = new_node(fraction_noad, 0);
> 1798            numerator(incompleat_noad_par) = new_node(sub_mlist_node, 0);
> 1799            math_list(numerator(incompleat_noad_par)) = vlink(head);
> 1800            vlink(head) = null;
> 1801            tail = head;
> 1802            m_style = cramped_style(m_style);
>
>
> I could not understand why the code above caused SEGV.
>
>
> Best regards
> Kazuki Maeda

I cannot reproduce it, but probably I have an old texlive 2016 --  I'm
updating now.
Can you send me the core dump off list ?

-- 
luigi