Description of problem:


Version-Release number of selected component (if applicable):
2.4.21-4.EL #1 RedHat EL 3 Update 1

How reproducible:
The following program has virtual memory leak.
The program was compiled on Redhat-8

#include <stdio.h>
#include <unistd.h>
#include <sys/mman.h>

main()
{
        void *a, *b, *c;
        int i;
        char buf[256], buff[5000];
        FILE *fp;

        sprintf(buf, "/proc/%d/status", getpid());

        for (i = 0; i < 100000; i++) {
                fp = fopen(buf, "r");
                fread(buff, sizeof(buff), 1, fp);
                a = mmap(0, 4096, PROT_READ|PROT_WRITE,
                        MAP_SHARED|MAP_ANONYMOUS, -1, 0);
                b = mmap(0, 4096, PROT_READ|PROT_WRITE,
                        MAP_SHARED|MAP_ANONYMOUS, -1, 0);
                c = mmap(0, 4096, PROT_READ|PROT_WRITE,
                        MAP_SHARED|MAP_ANONYMOUS, -1, 0);
                if ((long)a == -1 || (long)b == -1 || (long)c == -1)
                        abort();

                sleep(1);
                munmap(a, 4096);
                munmap(b, 4096);
                munmap(c, 4096);
                fclose(fp);
        }

        return 0;
}



The above problem seems to be solved in 2.6.8.1rc2 kernel patch
For more information see: http://lwn.net/Articles/93176/

Steps to Reproduce:
1. Compile the above program with g++/gcc on x86 m/c (32bit)
2. Run the compiled program and watch the VmSize of this process
   in /proc/<pid>/status file every 5 seconds.
  
Actual results:


Expected results:


Additional info: