Dear Hans, Luigi, Linays! First of all, thank you very much for your help! I have looked into the problem again more intensively and was able to find out a little more. I have encountered the error with LuaTeX Version 1.18.0 (7611) and Version 1.22.0 (7673) When I try to access the data field of this node, the described error occurs: │ ├─WHATSIT (write) stream 1, data '\@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5em\relax \rightskip 2.55em\parfillskip -\rightskip \parindent 1.5em\relax \let \interlinepenalty \@M \unhbox \voidb@x \@tempdima 2.3em\relax \advance \leftskip \@tempdima \hbox {}\protect \penalty \@M \hskip -\leftskip {\protect \hbox to\@tempdima {1\hfil }{\ignorespaces test}}\protect \penalty \@M \leaders \hbox {$\mathsurround \z@ \mkern 4.5mu\hbox {.}\mkern 4.5mu$}\hfill \protect \penalty \@M \hbox to1.55em{\hfil \protect \protect \edef TU{TU}\let \enc@update \relax \edef lmr{lmr}\edef m{m}\edef n{n}\let \protect \let }}}' Please note that this is purely read-only access. I have the impression that the data field can only be accessed once? That the node can no longer be used by internal algorithms after accessing the data field? I modified my debug document slightly. Now it uses my nodetree package \documentclass{article} \begin{document} \directlua{ local nodetree = require('nodetree') luatexbase.add_to_callback('vpack_filter', function(head) nodetree.print(head) end, 'debug' ) } \begin{figure} \caption{test} \end{figure} test \end{document} The compilation stops and when I press ENTER a few times, nodetree can finally render the debug node tree view. lualatex debug.tex: This is LuaHBTeX, Version 1.22.0 (TeX Live 2025) restricted system commands enabled. (./debug.tex LaTeX2e <2024-11-01> patch level 2 L3 programming layer <2025-04-29> (/usr/local/texlive/texmf-dist/tex/latex/base/article.cls Document Class: article 2024/06/29 v1.4n Standard LaTeX document class (/usr/local/texlive/texmf-dist/tex/latex/base/size10.clo)) (/usr/local/texlive/texmf-dist/tex/latex/l3backend/l3backend-luatex.def) (./debug.aux) ! Incomplete \iffalse; all text was ignored after line 14. <inserted text> \fi l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? ! Incomplete \iffalse; all text was ignored after line 14. <inserted text> \fi l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? ! Incomplete \iffalse; all text was ignored after line 14. <inserted text> \fi l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? ! Incomplete \iffalse; all text was ignored after line 14. <inserted text> \fi l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? ! Incomplete \iffalse; all text was ignored after line 14. <inserted text> \fi l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? Runaway text? \@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5\ETC. ! Forbidden control sequence found while scanning text of \write. <inserted text> } l.14 \end{figure} ? ├─WHATSIT (write) stream 1, data '\@writefile{lof}{\protect \gdef {}\vskip \z@ plus.2\p@ {\leftskip 1.5em\relax \rightskip 2.55em\parfillskip -\rightskip \parindent 1.5em\relax \let \interlinepenalty \@M \unhbox \voidb@x \@tempdima 2.3em\relax \advance \leftskip \@tempdima \hbox {}\protect \penalty \@M \hskip -\leftskip {\protect \hbox to\@tempdima {1\hfil }{\ignorespaces test}}\protect \penalty \@M \leaders \hbox {$\mathsurround \z@ \mkern 4.5mu\hbox {.}\mkern 4.5mu$}\hfill \protect \penalty \@M \hbox to1.55em{\hfil \protect \protect \edef TU{TU}\let \enc@update \relax \edef lmr{lmr}\edef m{m}\edef n{n}\let \protect \let }}}' ├─GLUE (userskip) wd 10pt ├─HLIST (box) wd 345pt, dp 2.06pt, ht 6.8pt │ ╚═head │ ├─GLUE (userskip) plus +1fil │ ├─HLIST (box) wd 59.94pt, dp 2.06pt, ht 6.8pt │ │ ╚═head │ │ ├─GLYPH (glyph) 'F', font 15, wd 6.53pt, ht 6.8pt │ │ ├─GLYPH (glyph) 'i', font 15, wd 2.78pt, ht 6.57pt │ │ ├─GLYPH (glyph) 'g', font 15, wd 5pt, ht 4.53pt, dp 2.06pt │ │ ├─DISC (regular) penalty 50 │ │ │ ╚═pre │ │ │ └─GLYPH (glyph) '-', font 15, wd 3.33pt, ht 2.45pt │ │ ├─GLYPH (glyph) 'u', font 15, wd 5.56pt, ht 4.42pt, dp 0.11pt │ │ ├─GLYPH (glyph) 'r', font 15, wd 3.92pt, ht 4.42pt │ │ ├─GLYPH (glyph) 'e', font 15, wd 4.44pt, ht 4.48pt, dp 0.11pt │ │ ├─PENALTY (userpenalty) 10000 │ │ ├─GLUE (spaceskip) wd 3.33pt, plus 1.66pt, minus 1.11pt │ │ ├─GLYPH (glyph) '1', font 15, wd 5pt, ht 6.66pt │ │ ├─GLYPH (glyph) ':', font 15, wd 2.78pt, ht 4.31pt │ │ ├─GLUE (spaceskip) wd 4.44pt, plus 3.33pt, minus 0.55pt │ │ ├─GLYPH (glyph) 't', font 15, wd 3.89pt, ht 6.15pt, dp 0.11pt │ │ ├─GLYPH (glyph) 'e', font 15, wd 4.44pt, ht 4.48pt, dp 0.11pt │ │ ├─GLYPH (glyph) 's', font 15, wd 3.94pt, ht 4.48pt, dp 0.11pt │ │ └─GLYPH (glyph) 't', font 15, wd 3.89pt, ht 6.15pt, dp 0.11pt │ └─GLUE (userskip) plus +1fil ├─GLUE (userskip) └─GLUE (userskip) └─VLIST (unknown) └─WHATSIT (write) stream 129, data '' ├─VLIST (unknown) └─GLUE (userskip) wd 12pt, plus 2pt, minus 2pt ├─GLUE (userskip) wd -12pt, plus -2pt, minus -2pt ├─GLUE (userskip) wd 20pt, plus 2pt, minus 4pt ├─GLUE (topskip) wd 3.85pt ├─HLIST (line) wd 345pt, dp 0.11pt, ht 6.15pt │ ╚═head │ ├─LOCAL_PAR │ ├─HLIST (indent) wd 15pt │ ├─GLYPH (glyph) 't', font 15, wd 3.89pt, ht 6.15pt, dp 0.11pt │ ├─GLYPH (glyph) 'e', font 15, wd 4.44pt, ht 4.48pt, dp 0.11pt │ ├─GLYPH (glyph) 's', font 15, wd 3.94pt, ht 4.48pt, dp 0.11pt │ ├─GLYPH (glyph) 't', font 15, wd 3.89pt, ht 6.15pt, dp 0.11pt │ ├─PENALTY (linepenalty) 10000 │ ├─GLUE (parfillskip) plus +1fil │ └─GLUE (rightskip) ├─GLUE (userskip) wd -0.11pt └─GLUE (userskip) plus +1fil ├─GLUE (userskip) └─GLUE (userskip) plus +0.000106812fil ├─GLUE (userskip) plus +1fil └─HLIST (box) wd 345pt ╚═head └─HLIST (box) wd 345pt ├─VLIST (unknown) ht 12pt ├─GLUE (userskip) wd 25pt ├─GLUE (lineskip) ├─VLIST (unknown) ht 550pt ├─GLUE (baselineskip) wd 23.34pt └─HLIST (box) wd 345pt, ht 6.66pt ╚═head └─HLIST (box) wd 345pt, ht 6.66pt ╚═head ├─GLUE (userskip) plus +1fil ├─GLYPH (glyph) '1', font 15, wd 5pt, ht 6.66pt └─GLUE (userskip) plus +1fil ├─GLUE (userskip) wd 16pt └─VLIST (unknown) shift 62pt [1] ├─GLUE (splittopskip) wd 10pt └─VLIST (unknown) └─WHATSIT (write) stream 129, data '' (./debug.aux)) (\end occurred when \iftrue on line 14 was incomplete) (\end occurred when \if on line 14 was incomplete) (\end occurred when \if on line 14 was incomplete) (\end occurred when \if on line 14 was incomplete) (\end occurred when \if on line 14 was incomplete) (\end occurred when \if on line 14 was incomplete) (\end occurred when \if on line 14 was incomplete) (\end occurred when \if on line 14 was incomplete) (\end occurred when \if on line 14 was incomplete) (\end occurred when \if on line 14 was incomplete) (\end occurred when \if on line 14 was incomplete) (\end occurred when \if on line 14 was incomplete) (\end occurred when \if on line 14 was incomplete) (\end occurred when \if on line 14 was incomplete) (\end occurred when \if on line 14 was incomplete) 898 words of node memory still in use: 10 hlist, 6 vlist, 1 rule, 1 disc, 1 local_par, 25 glue, 3 kern, 2 penalty, 19 glyph, 21 attribute, 48 glue_spec, 21 attribute_list, 3 write nodes avail lists: 2:21,3:1,4:1,5:31,7:1,9:2 Output written on debug.pdf (1 page, 888 bytes). Transcript written on debug.log. On 27.05.25 12:02, Hans Hagen wrote:
On 5/27/2025 7:23 AM, Linas Stonys wrote:
I think it is a bug. Luatex tries to expand data field content like with \edef thats why you get \iffalse. With older texlive (v0.76) the same example prints:
we now have luatex 1.12 so that is indeed old ... way too old to bother about here
table: 03420800 table: 034212F0 table: 03421318
\documentclass{article} \begin{document} \directlua{ callback.register('vpack_filter', function(head) if node.type(head.id) == 'whatsit' and head.subtype == 1 then print (head.data) end return true end, 'debug' ) } \begin{figure} \caption{test} \end{figure} \end{document}
On 5/17/2025 1:54 PM, Josef Friedrich wrote:
I’m the maintainer of the nodetree package. I got a bug report: https://github.com/Josef-Friedrich/nodetree/issues/46 I was able to narrow down the problem:
debug.tex:
\documentclass{article} \begin{document} \directlua{ luatexbase.add_to_callback('vpack_filter', function(head) if node.type(head.id) == 'whatsit' and head.subtype == 1 then local tmp = head.data end return true end, 'debug' ) } \begin{figure} \caption{test} \end{figure} \end{document}
lualatex debug.tex:
! Incomplete \iffalse; all text was ignored after line 19. <inserted text> \fi l.19 \end{figure} The line 'local tmp = head.data' causes the error. I tried also 'print(head.data)' or 'local tmp = head['data']'. These access types also caused a crash.
Access to fields other than data works without any problems.
print(head.stream) print(head.id) print(head.xxx)
Is this a bug in LuaTeX? Or how can I access the field 'data' of a whatsit(write) node for debugging purposes?
A tex error is not a crash and normally not a bug either. I suggest you look into what the "data" field gets set to which is unclear from your example.
Unfortunately I don't know how the data field of this particular node was set by LaTeX. I only know that this is related to the \caption macro. I have tried to reproduce the error artificially without LaTeX, but without success.
\directlua{ callback.register('vpack_filter', function(head) if node.type(head.id) == 'whatsit' and head.subtype == 1 then print(head.data) end return true end) }
\def\hello{\iftrue true\else false\fi} \def\world{\iftrue true\else false\fi} \protected\def\HELLO{\iftrue TRUE\else FALSE\fi} \protected\def\WORLD{\iftrue TRUE\else FALSE\fi}
\noindent \directlua{ local n = node.new("whatsit",1) n.data = [[(\hello\world)(\HELLO\WORLD)]] print(n.data) tex.print(n) } test test test
\bye
Thanks for the example. I can confirm that it compiles without errors.
So maybe use \tracingall in your latex example code to get an idea what is going on?
I have tried \tracingall, but I am overwhelmed by its verbosity. Here are a few lines before the error occurs ~........\selectfont ->\protect \selectfont ~........\selectfont ->\ifx \f@linespread \baselinestretch \else \set@fontsize \baselinestretch \f@size \f@baselineskip \fi \ifx \delayed@f@adjustment \@empt y \else \let \f@shape@saved \f@shape \let \f@series@saved \f@series \delayed@f@ adjustment \maybe@load@fontshape \ifcsname \f@encoding /\f@family /\f@series /\ f@shape \endcsname \else \let \f@shape \f@shape@saved \let \f@series \f@series@ saved \let \delayed@merge@font@shape \merge@font@shape \let \delayed@merge@font @series \merge@font@series \delayed@f@adjustment \let \delayed@merge@font@shape \merge@font@shape@without@substitution \let \delayed@merge@font@series \merge@ font@series@without@substitution \fi \let \delayed@f@adjustment \@empty \fi \@f orced@seriesfalse \xdef \font@name {\csname \curr@fontshape /\f@size \endcsname }\pickup@font \font@name \UseHook {selectfont}\size@update \enc@update {\ifx: (level 4) entered on line 17} {true} {\else: \ifx (level 4) entered on line 17} {\fi: \ifx (level 4) entered on line 17} {\ifx: (level 4) entered on line 17} {true} {\else: \ifx (level 4) entered on line 17} {\fi: \ifx (level 4) entered on line 17} ~........\@forced@seriesfalse ->\let \if@forced@series \iffalse {\iffalse: (level 4) entered on line 17} {false} ! Incomplete \iffalse; all text was ignored after line 17. <inserted text> \fi <to be read again> \endwrite <inserted text> }\endwrite \@endfloatbox ...pagefalse \outer@nobreak \egroup \color@endbox \end@float ->\@endfloatbox \ifnum \@floatpenalty <\z@ \@largefloatcheck \@co... \end ...ook {env/#1/end}}\csname end#1\endcsname \@checkend {#1}\endgroup \... l.17 \end{figure} ? ! Emergency stop. <inserted text> \fi <to be read again> \endwrite <inserted text> }\endwrite \@endfloatbox ...pagefalse \outer@nobreak \egroup \color@endbox \end@float ->\@endfloatbox \ifnum \@floatpenalty <\z@ \@largefloatcheck \@co... \end ...ook {env/#1/end}}\csname end#1\endcsname \@checkend {#1}\endgroup \... l.17 \end{figure} Thanks Josef
Hans
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