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On Wed, 17 Aug 2011 14:38:31 +0200, Mike Pall wrote:

unpack() is not compiled, i.e. the trace is aborted there.

Nice to know.

>  local bit_set_1 = function(_bset,_byte,_bit)
>    _bset[_byte] = bor(bset[_byte],bmask_1[_bit])
>  end

The function as written above certainly doesn't work. You mix
_bset and bset (without underscore).

That's a typo that is not in the original code, sorry.

Even if that's just a typo, there's a high likeliness you're
overflowing a buffer somewhere (e.g. due to mixup of 0-based vs.
1-based indexing).

I have added an explicit assertion in my Lua source to check that,
and it is not triggered.

Try running under the memcheck tool of Valgrind

Apparently I cannot do that on x86_64?

Also try to enable assertions.

Done, changes nothing.

Pierre 'catwell' Chapuis