I found some issues on efika (with test suite from https://github.com/fperrad/lua-TestMore/tree/master/test_lua52) 1) tonumber doesn't handle base LuaJIT 2.0.0-beta10 -- Copyright (C) 2005-2012 Mike Pall. http://luajit.org/ JIT: ON ARMv6 ARMv6T2 ARMv7 fold cse dce fwd dse narrow loop abc fuse > print(tonumber(111,2)) 111 2) a segfault with a pathological __tostring LuaJIT 2.0.0-beta10 -- Copyright (C) 2005-2012 Mike Pall. http://luajit.org/ JIT: ON ARMv6 ARMv6T2 ARMv7 fold cse dce fwd dse narrow loop abc fuse > t = {} > mt = {} > setmetatable(t, mt) > mt.__tostring = "not a function" > tostring(t) Segmentation fault 3) an ARM specific behaviour of modulo ? LuaJIT 2.0.0-beta10 -- Copyright (C) 2005-2012 Mike Pall. http://luajit.org/ JIT: ON ARMv6 ARMv6T2 ARMv7 fold cse dce fwd dse narrow loop abc fuse > print(1%0) 1 François