linux-kernel - Re: [PATCH 1/1] pty, n_tty: continue processing input until the tty

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Message-ID: <20150316182420.GC3753@dm>
Date:	Mon, 16 Mar 2015 18:24:20 +0000
From:	Andy Whitcroft <apw@...onical.com>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH 1/1] pty, n_tty: continue processing input until the
 tty_buffer chain is flushed

On Mon, Mar 16, 2015 at 02:03:23PM -0400, Peter Hurley wrote:

> I just managed to reproduce this problem with a test jig;
> can you confirm that your self-tests also use >= 4096-byte read buffer
> (which I think is necessary to trigger the worker race)?

The read which triggers the EIO is indeed using a 4096 byte buffer:

    1396 read(17, 0x7f78214c3b30, 4096) = -1 EIO (Input/output error)

We found a simpler reproduce by than the upstart selftest which is included
in the bug linked in the commit text.  Specifically in comment 13 [1].

Thanks for looking at this.

-apw

[1] https://bugs.launchpad.net/ubuntu/+source/upstart/+bug/1429756/comments/13
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