Christoph Hellwig <hch@xxxxxx> writes: > On Thu, Jan 18, 2018 at 11:44:03AM -0500, Jeff Moyer wrote: >> Jeff Moyer <jmoyer@xxxxxxxxxx> writes: >> >> > FYI, this kernel has issues. It will boot up, but I don't have >> > networking, and even rebooting doesn't succeed. I'm looking into it. >> >> A bisect lands on: eventfd: switch to ->poll_mask. That's not super >> helpful, though. I did run the ltp eventfd2 tests, and they all pass. >> >> The actual issue I get on boot is that several services don't start: >> >> [...] >> >> Christoph, are you able to reproduce this? > > No, I can't reproduce any of that. But I don't have a Fedora system > either, so this might be a new systemd version doing funky things. > > The major change in this version was to call ->poll_mask before setting up > the wait queue as well. This does the right thing for poll and aio poll, > but the more I dig into the epoll code the less sure I am it does the right > thing for it, or in fact that epoll does the right thing in general.. > > Do you still see it with the patch below applied? No, that fixes it for me. -Jeff > diff --git a/fs/select.c b/fs/select.c > index 707abe79536b..1784c1a29253 100644 > --- a/fs/select.c > +++ b/fs/select.c > @@ -53,9 +53,9 @@ __poll_t vfs_poll(struct file *file, struct poll_table_struct *pt) > head = vfs_get_poll_head(file, events); > if (!head) > return DEFAULT_POLLMASK; > - mask = file->f_op->poll_mask(file, events); > - if (mask) > - return mask; > +// mask = file->f_op->poll_mask(file, events); > +// if (mask) > +// return mask; > > pt->_qproc(file, head, pt); > }
