Re: [PATCH] kernel: make TIF_NOTIFY_SIGNAL and core dumps co-exist

Olivier Langlois
2021-08-22T20:55:11Z

On Thu, 2021-08-19 at 08:59 -0600, Jens Axboe wrote:
>
> You're absolutely right. On the io_uring side, in the current tree,
> there's only one check where current != task being checked - and
> that's
> in the poll rewait arming. That one should likely just go away. It
> may
> be fine as it is, as it just pertains to ring exit cancelations. We
> want
> to ensure that we don't rearm poll requests if the process is
> canceling
> and going away. I'll take a closer look at that one.
>
> For this particular patch, I agree it's racy. I'll see if I can come
> up
> with something better...
>
I have finally found the patch that you wanted me to test. I'm going to
do it ASAP despite still having issue.

I do have a different approach to solve the same core dump issue.

Feel free to consider it if this can avoid the race condition described
here.