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
