[tex-live] luaotfload-tool hangs

[Stephen Moye]

I am having trouble with luaotfload-tool (Mac OS 10.10.4, MacTeX 2015).
It begins...

|17:11 ~% luaotfload-tool -vvv -u
luaotfload | util : Setting the log level to 3.
luaotfload | util : Task completed successfully.
luaotfload | db : Updating the font names database.
luaotfload | db : Font names database not found, generating new one.
luaotfload | db : This can take several minutes; please be patient.
luaotfload | db : Updating the font names database.
luaotfload | db : Blacklisted file "Skia.ttf" via "/usr/local/texlive/2015/texmf-dist/tex/luatex/luaotfload/luaotfload-blacklist.cnf".
luaotfload | db : Blacklisted file "LastResort.ttf" via "/usr/local/texlive/2015/texmf-dist/tex/luatex/luaotfload/luaotfload-blacklist.cnf".
luaotfload | db : Blacklisted file "lingoes.ttf" via "/usr/local/texlive/2015/texmf-dist/tex/luatex/luaotfload/luaotfload-blacklist.cnf".
luaotfload | db : Blacklisted file "Diablindall.ttf" via "/usr/local/texlive/2015/texmf-dist/tex/luatex/luaotfload/luaotfload-blacklist.cnf".
luaotfload | db : Blacklisted file "spltfgbd.ttf" via "/usr/local/texlive/2015/texmf-dist/tex/luatex/luaotfload/luaotfload-blacklist.cnf".
luaotfload | db : Blacklisted file "spltfgbi.ttf" via "/usr/local/texlive/2015/texmf-dist/tex/luatex/luaotfload/luaotfload-blacklist.cnf".
luaotfload | db : Blacklisted file "spltfgit.ttf" via "/usr/local/texlive/2015/texmf-dist/tex/luatex/luaotfload/luaotfload-blacklist.cnf".
luaotfload | db : Blacklisted file "spltfgrg.ttf" via "/usr/local/texlive/2015/texmf-dist/tex/luatex/luaotfload/luaotfload-blacklist.cnf".
luaotfload | db : Blacklisting 8 files and directories.
luaotfload | db : Whitelisting 0 files.
luaotfload | db : Scanning TEXMF for fonts...
luaotfload | db : Initiating scan of 519 directories.
luaotfload | db : Collected 2396 files.
luaotfload | db : Scanning system fonts...
luaotfload | db : Searching in static system directories...

...and then hangs -- forever. It was suggested that perhaps reinstalling MacTeX2015 might solve the problem.

Seems a bit extreme to fix one possibly excessively fragile command. Is there a way to reinstall LuaTeX instead?

tlmgr has a --reinstall option which looks promising, but I don't know how it would be called in this case.

Thanks in advance

Stephen Moye