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Date:   Wed, 1 May 2019 02:26:26 +0000
From:   Eric Wong <>
To:     Deepa Dinamani <>
Cc:     Davidlohr Bueso <>, Arnd Bergmann <>,
        Al Viro <>,
        Jason Baron <>,
        Linux Kernel Mailing List <>,
        Omar Kilani <>,
        Linux FS-devel Mailing List <>
Subject: Re: Strange issues with epoll since 5.0

Eric Wong <> wrote:
> Deepa Dinamani <> wrote:
> > I'm not sure what the hang in the userspace is about. Is it because
> > the syscall did not return an error or the particular signal was
> > blocked etc.
> Uh, ok; that's less comforting.

Nevermind, I think I understand everything, now.  epoll_pwait
never set errno without our patch.

cmogstored does this in notify.c:

	/* wait_intr calls epoll_pwait: */
        mfd = mog_idleq_wait_intr(mog_notify_queue, timeout);
        if (mfd)
        else if (errno == EINTR) /* EINTR fails to be noticed */

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