reproducer for cygwin hangs under emulation on arm64

testfork.c

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

#ifndef BINARY
#define BINARY "/bin/true"
#endif

#ifndef ARG
#define ARG "0.1"
#endif

int main(int argc, char ** argv)
{
	while (1)
	{
		int pid;
		printf("Starting group of 100x " BINARY " " ARG "\n");
		for (int i = 0; i < 100; ++i)
		{
			pid = fork();
			if (pid == -1)
			{
				perror("fork error");
				return 1;
			}
			else if (pid == 0)
			{
				if ((pid = fork()) == 0)
				{
					char * const args[] = {BINARY, ARG, NULL};
					execv(BINARY, args);
					perror("execv failed");
					_exit(5);
				}
				if (pid == -1)
				{
					perror("inner fork error");
					_exit(1);
				}
				else
				{
					_exit(0);
				}
			}
			else
			{
				int status;
				if (waitpid(pid, &status, 0) == -1)
				{
					perror("waitpid error");
					return 2;
				}
				else if (status != 0)
				{
					fprintf(stderr, "subprocess exited non-zero: %d\n", status);
					return WEXITSTATUS(status);
				}
			}
		}
	}
	return 0;
}