I've found a hint (perhaps for Taco): When running luatex --ini --lua=/opt/TeX-live/texmf-var/luatex-cache/context/92a04c9ffb33efd4ef40317f33cfad27/formats/cont-en.luc /opt/TeX-live/texmf-context/tex/context/base/cont-en.tex '\dump' then luatex stops with these lines: loading : Context Core Macros / Variables ) (/opt/TeX-live/texmf-context/tex/context/base/luat-deb.tex loading : Communication Support (initialization) ) (/opt/TeX-live/texmf-context/tex/context/base/supp-box.tex loading : Context Support Macros / Boxes Segmentation fault Here are the last lines of strace: read(6, "\\setbox\\scratchbox\\normalhbox\n "..., 4096) = 4096 read(6, " optional height +/-dimen width"..., 4096) = 4096 read(6, "he \\TEX book. These macros can b"..., 4096) = 4096 read(6, "erately, for instance, making it"..., 4096) = 4096 read(6, "dp\\scratchdimen\n \\dp\\processbo"..., 4096) = 4096 read(6, "point\n \\def\\docommand\n {\\a"..., 4096) = 4096 times({tms_utime=130, tms_stime=9, tms_cutime=0, tms_cstime=0}) = 1801620712 --- SIGSEGV (Segmentation fault) @ 0 (0) --- +++ killed by SIGSEGV +++ Process 20275 detached Perhaps something for the luatex-bug-tracker, Taco? Cheers, Peter -- http://pmrb.free.fr/contact/