On Mon, Sep 30, 2013 at 6:53 PM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote: > > The problem is dup2() Shouldn't a cmpxchg() in just the dup2 code solve that? If the old value was NULL, you'd have to repeat and go back and see if the open_fds[] bit had been cleared in the meantime (ie it's NULL not because somebody else is busy installing it, but because somebody just uninstalled it). But yeah, I do agree that that sounds nasty and a complication I hadn't even thought about. dup2() does violate our normal "let's pre-allocate the fd slot" rule. Ugh. Linus -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html