Try this;

#!/usr/sbin/dtrace -s

#pragma D option quiet

extern int errno;

syscall::forkall:return,
syscall::vfork:return,
syscall::forksys:return,
syscall::fork1:return
/ arg0 == -1 || arg1 == -1 /
{
printf("FORKED FAILED, errno: %d, arg0: %d, arg1: %d\n",errno, arg0, arg1);
}
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