Hi Oleg, On Mon, Dec 10, 2018 at 04:37:18PM +0100, Oleg Nesterov wrote: > On 12/06, Eric W. Biederman wrote: > > > > The challenge is that we could be delivering this to a zombie signal > > group leader. > > ... > > > Sigh it is probably time that I dig in and figure out how to avoid that > > case which we need to fix anyway because we can get the permission > > checks wrong for multi-threaded processes that call setuid and friends. > > this is another issue... I am sure we have already discussed this, but I > failed to find any link to the previous discussion. > > > Once that is sorted your small change will at least be safe. > > I don't think so, any sub-thread can dequeue SIGSTOP unless type == > PIDTYPE_PID, > this has nothing to do with the problems connected to zombie leader, or I > misunderstood you.
I think the conclusion about this bug is that we're just not going to fix it, Kees sent a patch to remove the check from the test: https://lore.kernel.org/lkml/20181206235038.GA18273@beast/T/#u So I will drop my patch. Cheers, Tycho
