Stack overflow in gmp_get_str when passed a big number
tg at swox.com
Fri Oct 3 09:14:45 CEST 2008
> My Scheme compiler (Ikarus Scheme) uses gmp for its bignums. It uses
> gmp_get_str to convert bignums to base-10 strings. It also crashes
> when converting very large numbers. I have seen the problem under a
> Linux (2.6.18) machine with 2GB of ram, but it runs fine under OS X
> (10.4) with the same amount of ram. Attached is a small program that
> exhibits the problem. Let me know if I can provide more information
> and please let me know if there is a workaround (other that writing
> my own conversion routine). Thanks.
this is usually due to a stack overflow. Some GMP routines allocate memory
on the stack for a better efficiency, but for large problems this may lead
to problems. I believe this problem is fixed in the latest versions of GMP,
or a workaround is to configure GMP with --disable-alloca. See for example
With any recent GMP release, --disable-alloca should never be needed.
Aziz doesn't mention the used GMP version, leaving us to guess it.
I guess it is GMP 4.1.x, which I no longer maintain. :-)
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