[HACKERS] uninterruptible state in 10beta4

In 10beta4 and 11dev, If I run the below it enters an uninterruptible state.  After the insert starts, I give 15 or seconds or so until the memory usage starts to grow due to enqueued triggers checks. Then I can't interrupt it with either ctrl-C in psql or kill -15 <pid> from another terminal.

I have to do kill -9 <pid>

create table foo  (x int);

create or replace function notice () returns trigger as $$ begin raise notice 'asdfsdf'; return NEW; END;$$ language plpgsql;

create trigger foobar after insert on foo for each row execute procedure notice();

insert into foo select * from generate_series(1,100000000);

Git bisect lays the blame here which certainly seems plausible:

Cheers,

Jeff