linux-kernel - Re: 4.3 serial driver crashes with console shortly after boot

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Date:	Wed, 11 Nov 2015 06:14:30 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	gregkh@...uxfoundation.org, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: 4.3 serial driver crashes with console shortly after boot

On 11/10/2015 06:15 PM, Peter Hurley wrote:
> On 11/10/2015 05:43 PM, Andi Kleen wrote:
>> On Tue, Nov 10, 2015 at 11:39:57PM +0100, Andi Kleen wrote:
>>>> I've just tried to reproduce this without success on my current
>>>> tree which has some additional patches I just posted this am. They weren't
>>>> intended to fix crashes but they directly impact the area of concern. Could
>>>> you try these three?
>>>>
>>>> [PATCH v2 2/4] n_tty: Ignore all read data when closing
>>>> [PATCH v2 3/4] tty: Abstract and encapsulate tty->closing behavior
>>>> [PATCH v2 4/4] tty: Remove drivers' extra tty_ldisc_flush()
>>>>
>>> Applying the three patches fixes the crash. 
>>> I haven't tried to figure out which one did the trick.
>>
>> Actually I was wrong sorry. It still crashes, but now it doesn't
>> hang the system anymore.
> 
> Argghh.
> Can you run the patch below and send me full dmesg (privately if you prefer)?

Nevermind. I see how it's happening now; it's being initiated by hangup,
not close. FWIW, it's been like that nearly forever; your user-space/tool is
triggering this because ECHO is on.

Regards,
Peter Hurley

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