VM error while trying to dump emitted machine code in tnew.lua

Hi All I am getting following error when I try to dump the machine code for test/tnew.lua

$ ./luajit -jon -jdump=m ../test/tnew.lua ---- TRACE 1 start tnew.lua:1 ---- TRACE 1 mcode 316 VM handler failed: ./jit/dis_arm.lua:439: attempt to call upvalue 'concat' (a nil value)

$ ./luajit -jon -jdump=m ../test/tnew.lua ---- TRACE 1 start tnew.lua:1 ---- TRACE 1 mcode 384 VM handler failed: ./jit/dis_arm64.lua:755: attempt to call upvalue 'concat' (a nil value)

The error is seen on ARM64 and ARM32 but not on x64. I am having tough time to debug the asm_tbar function for failure of test_tnew. Any suggestion is welcome.

Abhishek Dikshit