RE: Allocation of too much memory hangs system, kernel 2.2.*

Adam Heath (doogie@debian.org)
Fri, 28 May 1999 17:52:07 -0500 (CDT)


On Wed, 26 May 1999, Giuliano Pochini wrote:

>
> //********** 1 ***
> void foo(){
> char a[16384];
> foo();
> }
> void main(){
> foo();
> }
>
> //********** 2 ***
> void main(){
> void *i;
> while(1) i=malloc(16384);
> }
>
>
> Program #1 ends with a huge core dump.
> Program #2 ends with a core too, but it is very little, about 8MB.
> Strange.

First program places a[] on the stack. This stack is constantly being
referenced, so it is physically allocated.

The 2nd prog, i is not accessed, and linux does mem alloc in overcommit mode.

I think, anyways. I am no expert.

Adam

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