linux-kernel - Re: Strange issues with epoll since 5.0

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Message-ID: <20190501073906.ekqr7xbw3qkfgv56@dcvr>
Date:   Wed, 1 May 2019 07:39:06 +0000
From:   Eric Wong <e@...24.org>
To:     Deepa Dinamani <deepa.kernel@...il.com>
Cc:     Davidlohr Bueso <dave@...olabs.net>, Arnd Bergmann <arnd@...db.de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Jason Baron <jbaron@...mai.com>, linux-kernel@...r.kernel.org,
        Omar Kilani <omar.kilani@...il.com>,
        linux-fsdevel@...r.kernel.org
Subject: Re: Strange issues with epoll since 5.0

Eric Wong <e@...24.org> wrote:
> (didn't test AIO, but everything else seems good)

"seems" != "is"

Now that I understand the fix for epoll, the fs/select.c changes
would hit the same problem and not return -EINTR when it should.

I'll let you guys decide how to fix this, but there's definitely
a problem when "(errno == EINTR)" comparisons in userspace
stop working.