linux-kernel - Re: WARNING: at drivers/tty/tty_buffer.c:476 flush_to

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Date:	Sat, 19 Jan 2013 16:51:16 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	sedat.dilek@...il.com
CC:	Dave Jones <davej@...hat.com>, Jiri Slaby <jslaby@...e.cz>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ilya Zykov <ilya@...x.ru>, LKML <linux-kernel@...r.kernel.org>,
	linux-next <linux-next@...r.kernel.org>,
	linux-serial@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Jan Kara <jack@...e.cz>, "Theodore Ts'o" <tytso@....edu>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: WARNING: at drivers/tty/tty_buffer.c:476 flush_to_ldisc()

On 1/19/13 4:44 PM, Sedat Dilek wrote:
> Hi Dave,
> 
> I suspected after initial testing a problem in TTY and applied two patches.
> After more testing the root cause was a problem in JBD2.
> A patch from Eric helped!

oh, excellent ;)

Helped what, exactly?

> Follow the thread in [1] for more details.
> 
> If you are on Linux-Next (next-20130118) you need the following three patches.
> 
> Ilya Zykov (2):
>       tty: Correct tty buffer flush.
>       tty: Add driver unthrottle in ioctl(...,TCFLSH,..).
> 
> Eric Sandeen (1):
>       jbd2: don't wake kjournald unnecessarily

Hum, I would not have expected this to *matter*, I thought it was just a perf
optimization.  Hm.  What do you think it fixed, exactly?

(sorry, have not followed that thread, busy elsewhere ATM)

-eric

> Hope this helps you.
> 
> Regards,
> - Sedat -
> 
> [0] http://marc.info/?t=135862023700004&r=1&w=2
> [1] http://marc.info/?l=linux-serial&m=135860500714909&w=2
> [2] http://git.kernel.org/?p=linux/kernel/git/gregkh/tty.git;a=commitdiff;h=a1bf9584429d61b7096f93ae09325e1ba538e9e8
> [3] http://patchwork.ozlabs.org/patch/207237/
> 

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