unshare dumps core on ppc64le due to use of vfork()

[Ricardo Branco]

To reproduce:

$ unshare -mrpf sh
sh-5.3# Segmentation fault (core dumped)

It seems related to vfork(), which is called in lots of places.

This simple program dumps core on ppc64le:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
int main(int argc, char *argv[])
{
    int child = vfork();
    printf("Child: %d\n", child);

    if (child) {
        sleep(1);
        int ret = waitpid(child,0, 0);
    }
    return EXIT_SUCCESS;
}

https://github.com/opencontainers/runc/issues/4836#issuecomment-3257567225
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