Re: LuaJIT : Internal error - Stack overflow

[HyperHacker <hyperhacker@...>]

On Wed, Mar 23, 2011 at 07:36, Eike Decker <zet23t@googlemail.com> wrote:
> 2011/3/23 Sylvain Fabre <sylvain.fabre@inpixal.com>:
>> Le 23/03/2011 12:01, Mike Pall a écrit :
>>>
>>> Sylvain Fabre wrote:
>>>>
>>>> After approx. 6 hours of processing, i get the following lua error :
>>>> "Internal error - Stack overflow", but with no other specific clues.
>>>
>>> The string "Internal error" appears nowhere in the source code of
>>> LuaJIT. Also, a Lua stack overflow would show with a lower case
>>> error message ("stack overflow").
>>>
>>> I suggest you look for the component that generates the error.
>>
>> Yes, sorry : "Internal error" is coming from our layer, and we get a "stack
>> overflow" from LuaJIT (ie  in lower case).
>
> You could try to lower the available stack size (I think that's
> possible somewhere...) to avoid 6hour+ runtime for debugging. And a
> traceback would certainly help to pinpoint the problem in no time ;)
> Also, it could be that you don't do tail recursions correctly in some loop, like
>
> function frame()
>  -- stuff
>  return frame()+1 -- <- +1 prevents successful tail recursion
> end
>
> Beyond that, I think to remember that some debug options disable tail
> recursions and therefore can also lead to stack overflows where none
> should happen. But could be wrong on that.
>
> Cheers,
> Eike
>
>

I remember someone asking about a debug option to disable tail
recursion, to make tracebacks easier to follow, but I don't know of
one actually existing in Lua? Or is it only in LuaJIT? Would certainly
be nice to have.

-- 
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