random corruption while doing popen pclose

[Ajeet Yadav <ajeet dot yadav dot 77 at gmail dot com>]

Linux version 3.0.33 (Cortex A15)
 Below program crashes with 2.14.1 glibc but runs fine with 2.11.1 glibc.

#include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <signal.h>
 #include <string.h>
 #include <errno.h>

#define MAX_LINE_SIZE 80

#define MAX_THREAD 20
 #define MAX_POPEN 10
 #define MALLOC_SIZE 16

void* pipe_thread(void *arg)
 {
     int i;
     char *p = NULL;
     FILE *fp[MAX_POPEN];
     char shellCommand[MAX_LINE_SIZE];

    memset(shellCommand, 0x00, MAX_LINE_SIZE);
     sprintf(shellCommand, "mount");
     signal(SIGPIPE, SIG_IGN);

    while (1) {
         for (i = 0; i < MAX_POPEN; ++i) {
             fp[i] = popen(shellCommand, "r");
         }

        if (p) {
             free(p);
         }

        for (i = 0; i < MAX_POPEN; ++i) {
             if (fp[i])
                 pclose(fp[i]);
         }

        p = malloc(MALLOC_SIZE);
         if (p)
             memset(p, 0, MALLOC_SIZE);
     }
     return NULL;
 }

int main(int argc, char *argv[])
 {
     int i;
     pthread_t tid;

    for (i = 0; i < MAX_THREAD; ++i) {
         pthread_create(&tid, NULL, &pipe_thread, (void*)NULL);
     }
     sleep(60);
 }

gdb logs:
 (gdb) bt
 #0  0x4014f998 in _IO_new_fclose (fp=0x1) at iofclose.c:74
 #1  0x4015b59c in fwide (fp=0xb8, mode=<optimized out>) at fwide.c:47
 #2  0x00008a6c in ?? ()
 Cannot access memory at address 0x8
 #3  0x00008a6c in ?? ()
 Cannot access memory at address 0x8
 Backtrace stopped: previous frame identical to this frame (corrupt stack?)