linux-kernel - mprotect() failed: Cannot allocate memory

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Message-Id: <201004210105.20942.pluto@agmk.net>
Date:	Wed, 21 Apr 2010 01:05:20 +0200
From:	Paweł Sikora <pluto@...k.net>
To:	libc-help@...rceware.org, linux-kernel@...r.kernel.org
Subject: mprotect() failed: Cannot allocate memory

hi,

i'm trying to debug an ugly application with ElectricFence.
in fact, on x86-64 box with 8GB ram and 16GB swap i'm getting following error:

"ElectricFence Exiting: mprotect() failed: Cannot allocate memory"

the program has been compiled with gcc-4.5, glibc-2.11.1, kernel-2.6.32.
did you ever come across such (kernel/glibc) limitations?

here's a simple testcase which triggs -ENOMEM in mprotect().

#define N 100
#include<stdlib.h>

double **bm;
int main(){
    int i;
    long NN = 4*N*N;
    int kmax=100;

        bm = (double **)malloc((time_t)NN*sizeof(double *));
        for(i=0; i<NN; ++i){
                bm[i] = (double*)malloc((time_t)kmax*sizeof(double));
        }

        for(i=0; i<NN; ++i){
                free(bm[i]);
        }
        free(bm);
        return 0;
}

thanks for any hint,

BR,
Pawel.
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