linux-kernel - Re: Bug in tty cooked mode kernel 3.12.3

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Date:	Sat, 7 Dec 2013 23:18:11 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Karl Dahlke <eklhad@...cast.net>
Cc:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: Bug in tty cooked mode kernel 3.12.3

On Sun, Dec 08, 2013 at 01:16:09AM -0500, Karl Dahlke wrote:
> As per your direction, I applied Peters patch to n_tty.c,
> which looked like it was in the ballpark, echoing newline etc,
> but it did not fix the problem.
> It is still reproducible on my system as below.
> 
> > Come up in run level 3, command line mode,
> > and bring up two consoles with bash in cooked mode.
> > Set a simple prompt like this.
> >
> > PS1='$ '
> >
> > Switch to console 2 via alt-f2.
> > Hit return.
> > The cursor should drop to a new line then give you the $ prompt.
> > But it puts the $ prompt next too the old one, then drops down
> > to a blank line.
> > The $ prompt and the crlf are out of sequence.
> > Hit return a few more times and it will straighten itself out.
> > Then switch back to console 1 alt-f1
> > Hit return and the same bug,
> > $ $
> >
> > hit return a few more times to straighten it out.
> > Switch back to console 2 and the same problem.
> 
> Thank you for your quick reply,and the patch to try.
> I'm afraid however this is still an unsolved problem.
> Realize that it pops up rarely and randomly in just about any cooked program;
> I chose the console switch example because it most reliably reproduces the bug.

Ah, sorry, wrong patch series.

Search lkml for:
	Subject: [PATCH tty-next 0/4] tty: Fix ^C echo
for a 4 patch series that should resolve this issue.  If you could test
that out, and let us know, that would be great.

thanks,

greg k-h
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