linux-kernel - Re: PROBLEM: Race condition in tty buffer's function flush_to

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Message-ID: <20111107115802.23201d45@bob.linux.org.uk>
Date:	Mon, 7 Nov 2011 11:58:02 +0000
From:	Alan Cox <alan@...ux.intel.com>
To:	Ilya Zykov <ilya@...x.ru>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: Race condition in tty buffer's function
 flush_to_ldisc().

On Mon, 07 Nov 2011 15:14:34 +0400
Ilya Zykov <ilya@...x.ru> wrote:

> Function flush_to_ldisc() call disc->ops->receive_buf(),
> without tty->buf.lock and with TTY_FLUSHING bit set.

flush_to_ldisc is single threaded for a given tty. If you fail to
ensure that is the case everything breaks.

What cases does this occur ?

Also for the other patches do you have benchmarks yet ?

Alan
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