On Tue, Oct 15, 2013 at 10:08 PM, Paul Isambert <[email protected]>wrote:
> Hello all, > > I’ve encountered a problem which I definitely can’t solve. It looks > like a TeX problem, but since I really can’t see what’s going on I > suspect a LuaTeX bug. Unfortunately the problem is extremely sensitive > to simple changes, and so I can’t even compare with a PDFTeX > compilation. (And since there is a lot of my own code involved, I > cannot do a minimal example either.) > > Here’s what \tracingpages returns in my log file (until the current > page is deemed good): > > 1. %% goal height=569.05511, max depth=4.0 > 2. % split251 to 0.0,38.12 p=-10000 > 3. % split252 to 0.0,103.05 p=-10000 > 4. % t=0.0 g=498.47559 b=10000 p=0 c=100000# > 5. % t=22.0 g=498.47559 b=10000 p=150 c=100000# > 6. % t=45.22 g=498.47559 b=10000 p=0 c=100000# > 7. % t=70.16 g=498.47559 b=10000 p=0 c=100000# > 8. % t=93.27 g=498.47559 b=10000 p=150 c=100000# > 9. % t=105.27 g=498.47559 b=10000 p=0 c=100000# > 10. % t=121.27 plus 1.0fil g=498.47559 b=0 p=150 c=-19850# > 11. % t=133.27 plus 1.0fil g=498.47559 b=0 p=0 c=-20000# > 12. % t=145.27 plus 1.0fil g=498.47559 b=0 p=0 c=-20000# > 13. % t=157.27 plus 1.0fil g=498.47559 b=0 p=150 c=-19850 > 14. % t=169.27 plus 1.0fil g=498.47559 b=0 p=0 c=-20000# > 15. % t=185.27 plus 2.0fil g=498.47559 b=0 p=150 c=-19850 > 16. % t=197.27 plus 2.0fil g=498.47559 b=0 p=150 c=-19850 > 17. % t=209.27 plus 2.0fil g=498.47559 b=0 p=0 c=-20000# > 18. % t=209.27 plus 3.0fil g=498.47559 b=0 p=-11000 c=-11000 > > What bothers me is line 10 and following: where does the cost of > -20000 comes from? There is no penalty of that value for each of those > line, so I really can’t see how it can be computed (since, basically, > the cost of a breakpoint is badness + penalty). Then the page is > broken at the wrong place – even though breaking is of course > triggered by the big negative penalty at line 18. > > (You may note that outputting the page at line 17 instead of 18 > doesn’t change anything, since no material is added, so this > troublesome bahavior isn’t so troublesome; well, actually it is, when > you’re expecting a given \outputpenalty.) > > So, have I missed some obvious subtlety? > > Best, > Paul > > Maybe in buildpage there is something more: $> cweave buildpage.w $> pdftex buildpage.tex buildpage.w is into source/texk/web2c/luatexdir/tex -- luigi
