linux-kernel - Re: pselect/etc semantics

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Message-ID: <871s0grlzo.fsf@xmission.com>
Date:   Thu, 30 May 2019 10:38:19 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     Deepa Dinamani <deepa.kernel@...il.com>,
        Al Viro <viro@...IV.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        arnd@...db.de, dbueso@...e.de, axboe@...nel.dk, dave@...olabs.net,
        e@...24.org, jbaron@...mai.com, linux-fsdevel@...r.kernel.org,
        linux-aio@...ck.org, omar.kilani@...il.com, tglx@...utronix.de,
        stable@...r.kernel.org
Subject: Re: pselect/etc semantics

ebiederm@...ssion.com (Eric W. Biederman) writes:

> Which means I believe we have a semantically valid change in behavior
> that is causing a regression.

I haven't made a survey of all of the functions yet but
fucntions return -ENORESTARTNOHAND will never return -EINTR and are
immune from this problem.

AKA pselect is fine.  While epoll_pwait can be affected.

Has anyone contacted Omar Kilani to see if that is his issue?
https://lore.kernel.org/lkml/CA+8F9hicnF=kvjXPZFQy=Pa2HJUS3JS+G9VswFHNQQynPMHGVQ@mail.gmail.com/

So far the only regression report I am seeing is from Eric Wong.
AKA https://lore.kernel.org/lkml/20190501021405.hfvd7ps623liu25i@dcvr/
Are there any others?  How did we get to be talking about more
than just epoll_pwait?

Eric