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

[Thomas Gleixner]

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