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Thanks for the report. See

On Mon, 15 Aug 2022 at 18:11 Kurt Jung <> wrote:
When compiling multiple Lua files with luac (5.4.4) on Ubuntu I
encounter the following:

> free(): double free detected in tcache 2
> Aborted

I think this happens because of the line

> luaM_freearray(L,f->lineinfo,f->sizelineinfo);

in the combine() function of luac.c. At least, when that line is
commented, valgrind reports no errors and no unfreed memory.

-- Kurt Jung