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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 24 Aug 2017 10:52:21 -0700
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Subject: Re: [PATCH 0/1] devpts: use dynamic_dname() to generate proc name
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Stefan Lippers-Hollmann <s.l-h@gmx.de>,
        Christian Brauner <christian.brauner@canonical.com>,
        Christian Brauner <christian.brauner@ubuntu.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
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        Al Viro <viro@zeniv.linux.org.uk>,
        Thorsten Leemhuis <regressions@leemhuis.info>
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On Thu, Aug 24, 2017 at 8:54 AM, Eric W. Biederman
<ebiederm@xmission.com> wrote:
>
> Weird.  There is at least one leak inducing bug in there.  So perhaps
> that is the cause.   *Scratches my head*  Are you also testing the new
> ioctl?

I can verify, and it's not the leak. I tried your patch with that leak
fix (and the other fixes I pointed out), and I see similar issues that
Stefan noted.

With gnome-terminal, the terminal window opens, and then it says

   Failed to open PTY: No such device

and the terminal obviously doesn't work.

And I see the error: your devpts_ptmx_path() code always returns
-ENODEV because you set the error unconditionally before an error
check, and then you don't clear it if the error didn't happen.

I'll test the fix.

                    Linus