Re: [RFC v2 PATCH] futex: extend set_robust_list to allow 2 locking ABIs at the same time.

Thomas Gleixner
2019-11-05T14:53:49Z

On Tue, 5 Nov 2019, Florian Weimer wrote:
> * Carlos O'Donell:
> > "Robust mutexes do not take ROBUST_LIST_LIMIT into account"
> > https://sourceware.org/bugzilla/show_bug.cgi?id=19089
>
> That's just a missing check in our implementation and something that few
> applications will encounter, if any. There is this one here:
>
> <https://sourceware.org/bugzilla/show_bug.cgi?id=19004>
>
> It contains a kernel patch.
>
> I thought that there were more issues in the current implementation, but
> I can't a record of them. 8-(

There is a nasty one in my inbox with a kernel patch fixing it, which I
still need to review with all futex brain cells activated:

https://lore.kernel.org/r/1572573789-16557-1-git-send-email-wang.yi59@zte.com.cn

Thanks,

tglx