Bug: Crash after forked child exits

#include <stdio.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
	pid_t pid;
	printf("enter\n");
	
	pid = vfork();
	
	if(pid < 0)
	{
		printf("error %d\n", pid);
		return 1;
	}
	
	if(pid == 0)
	{
		printf("parent\n");
	}
	else
	{
		printf("child %d\n", pid);
	}
	
	printf("exit\n");
	return 0;
}

The stack trace (from .com.dbg) shows null pointer at the top of the stack.


enter
[Detaching after vfork from child process 11666]
parent
exit
child 11666
exit

Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x00000000042015de in _start () at libc/crt/crt.S:128


In non-debug binary there are 5 pointers without labels, the top one is null.


Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x00000000042015de in ?? ()
#2  0x0000000000000001 in ?? ()
#3  0x00007fffffffe318 in ?? ()
#4  0x0000000000000000 in ?? ()