crash on __gmpz_init

Vincent Lefevre vincent at
Mon Jan 22 11:51:21 CET 2024

On 2024-01-22 11:02:21 +0100, Marc Glisse wrote:
> Hello,
>   mpz_class M[LINES][COLS];
> you are trying to put an array with millions of elements on the stack, so
> the stack overflows. Very large arrays need to be allocated on the heap in
> C++ (new, malloc, or some wrapper like std::vector).

Note that the user has a segmentation fault in __gmpz_init for
test2_mem.c too (tc_7000x5000), which uses malloc(). See the
gdb output.

Vincent Lefèvre <vincent at> - Web: <>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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