Re: [RFC PATCH v9 02/13] x86: always set IF before oopsing from page fault

[Sebastian Andrzej Siewior]

- stepping on del button while browsing though CCs.
On 2019-04-04 09:47:27 [-0600], Tycho Andersen wrote:
> > Hmm.  do_exit() isn't really meant to be "try your best to leave the
> > system somewhat usable without returning" -- it's a function that,
> > other than in OOPSes, is called from a well-defined state.  So I think
> > rewind_stack_do_exit() is probably a better spot.  But we need to
> > rewind the stack and *then* turn on IRQs, since we otherwise risk
> > exploding quite badly.
> 
> Ok, sounds good. I guess we can include something like this patch in
> the next series.

The tracing infrastructure probably doesn't know that the interrupts are
back on. Also if you were holding a spin lock then your preempt count
isn't 0 which means that might_sleep() will trigger a splat (in your
backtrace it was zero).

> Thanks,
> 
> Tycho
Sebastian