LuaLaTeX does not use the correct font shape.
The following minimal example
\documentclass{scrartcl}
\usepackage{fontspec}
\setmainfont{DejaVu Serif}
\setsansfont{DejaVu Sans}
\setmonofont{DejaVu Sans Mono}
\listfiles
\begin{document}
This is a Test.
\textbf{This is a Test.}
\textsf{This is a Test.}
\textsf{\textbf{This is a Test.}}
\texttt{This is a Test.}
\end{document}
compiled with TexLive 2013 results in the following document:
Instead of using normal DejaVuSans, ExtraLight shape is embedded into the document. But the correct bold font is used.
Compiling this document with TexLive 2012, the correct fonts are used.
minimal.cls 2001/05/25 Standard LaTeX minimal class
fontspec.sty 2013/05/20 v2.3c Font selection for XeLaTeX and LuaLaTeX
expl3.sty 2013/07/28 v4582 L3 Experimental code bundle wrapper
l3names.sty 2012/12/07 v4346 L3 Namespace for primitives
l3bootstrap.sty 2013/07/28 v4581 L3 Experimental bootstrap code
luatex.sty 2010/03/09 v0.4 LuaTeX basic definition package (HO)
infwarerr.sty 2010/04/08 v1.3 Providing info/warning/error messages (HO)
ifluatex.sty 2010/03/01 v1.3 Provides the ifluatex switch (HO)
etex.sty 1998/03/26 v2.0 eTeX basic definition package (PEB)
luatex-loader.sty 2010/03/09 v0.4 Lua module loader (HO)
pdftexcmds.sty 2011/11/29 v0.20 Utility functions of pdfTeX for LuaTeX (HO)
ltxcmds.sty 2011/11/09 v1.22 LaTeX kernel commands for general use (HO)
ifpdf.sty 2011/01/30 v2.3 Provides the ifpdf switch (HO)
l3basics.sty 2013/07/28 v4581 L3 Basic definitions
l3expan.sty 2013/07/24 v4565 L3 Argument expansion
l3tl.sty 2013/07/28 v4581 L3 Token lists
l3seq.sty 2013/07/28 v4581 L3 Sequences and stacks
l3int.sty 2013/07/28 v4581 L3 Integers
l3quark.sty 2013/07/21 v4564 L3 Quarks
l3prg.sty 2013/07/28 v4581 L3 Control structures
l3clist.sty 2013/07/28 v4581 L3 Comma separated lists
l3token.sty 2013/07/28 v4581 L3 Experimental token manipulation
l3prop.sty 2013/07/28 v4581 L3 Property lists
l3msg.sty 2013/07/28 v4581 L3 Messages
l3file.sty 2013/07/28 v4581 L3 File and I/O operations
l3skip.sty 2013/07/28 v4581 L3 Dimensions and skips
l3keys.sty 2013/07/28 v4581 L3 Experimental key-value interfaces
l3fp.sty 2013/07/09 v4521 L3 Floating points
l3box.sty 2013/07/28 v4581 L3 Experimental boxes
l3coffins.sty 2012/09/09 v4212 L3 Coffin code layer
l3color.sty 2012/08/29 v4156 L3 Experimental color support
l3luatex.sty 2013/07/28 v4581 L3 Experimental LuaTeX-specific functions
l3candidates.sty 2013/07/24 v4576 L3 Experimental additions to l3kernel
xparse.sty 2013/07/28 v4582 L3 Experimental document command parser
luaotfload.sty 2013/07/23 v2.3b OpenType layout system
luatexbase.sty 2013/05/11 v0.6 Resource management for the LuaTeX macro programmer
luatexbase-compat.sty 2011/05/24 v0.4 Compatibility tools for LuaTeX
luatexbase-modutils.sty 2013/05/11 v0.6 Module utilities for LuaTeX
luatexbase-loader.sty 2013/05/11 v0.6 Lua module loader for LuaTeX
luatexbase-regs.sty 2011/05/24 v0.4 Registers allocation for LuaTeX
luatexbase-attr.sty 2013/05/11 v0.6 Attributes allocation for LuaTeX
luatexbase-cctb.sty 2013/05/11 v0.6 Catcodetable allocation for LuaTeX
luatexbase-mcb.sty 2013/05/11 v0.6 Callback management for LuaTeX
fontspec-patches.sty 2013/05/20 v2.3c Font selection for XeLaTeX and LuaLaTeX
Edit:
After a reinstallation of TexLive 2013 from a DVD everything worked as expected.
Then I updated the luaotfload-package (30701 -> 31286) and the error was there again.
While running LuaLaTeX I got the following message:
luaotfload | db : Version mismatch; expected 2.207, got 2.204
luaotfload | db : Force rebuild
luaotfload | db : Version mismatch; expected 2.207, got 2.204
luaotfload | db : Force rebuild(load luc: /usr/local/texlive/2013/texmf-var/luatex-cache/generic/fonts/otf/dejavuserif.luc)
This was repeated multiple times (for every dejavu-font on my system, as it seems) and happend every time I run LuaLaTeX.
With luaotfload-tool --force --update -v I rebuilt the fonts database and the next run of lualatex was without those forced rebuilds. But sadly, the output is still the same.
luaotfload-names.luaso thatluaotfloadhad to rebuild the font names database, but the result was the same.