Comment 33 for bug 1672819

Guys,
your commit d6572202d986 ("UBUNTU:SAUCE: exec: ensure file system accounting in check_unsafe_exec is correct") looks wrong for me,
it leads to endless cycle in check_unsafe_exec().

fs/exec.c:: check_unsafe_exec()
...
recheck:
        fs_recheck = false;
        t = p;
        n_fs = 1;
        spin_lock(&p->fs->lock);
        rcu_read_lock();
        while_each_thread(p, t) {
                if (t->fs == p->fs)
                        n_fs++;
                if (t->flags & (PF_EXITING | PF_FORKNOEXEC))
                        fs_recheck = true;
        }
        rcu_read_unlock();

        if (p->fs->users > n_fs) {
                if (fs_recheck) {
                        spin_unlock(&p->fs->lock);
                        goto recheck; <<<<<< cycles forever
                }
                bprm->unsafe |= LSM_UNSAFE_SHARE;
        } else
                p->fs->in_exec = 1;
        spin_unlock(&p->fs->lock);

We have few Soft lockups inside VMs with ubuntu 16.04, where process was cyceled here.
Should I submit you separate bug for this problem?