linux-kernel - Re: Success: tty_io flush_to_ldisc() error message triggered

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Message-ID: <44C2307C.9060607@microgate.com>
Date:	Sat, 22 Jul 2006 09:04:44 -0500
From:	Paul Fulghum <paulkf@...rogate.com>
To:	Chuck Ebbert <76306.1226@...puserve.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: Success: tty_io flush_to_ldisc() error message triggered

Chuck Ebbert wrote:
> Using the patch below that you sent me, this message printed today on
> my SMP system when terminating pppd:
> 
>         flush_to_ldisc - TTY_FLUSHING set, low_latency=0
> 
> And this bug is also in 2.6.17.4 - I forgot to reboot into 2.6.16.x
> and the system locked up the same way 2.6.16 used to.  That was made
> even more fun by the 'SysRq broken on SMP' bug fixed by a pending
> 2.6.17.7 patch...

That confirms my thoughts on what went wrong:
multiple copies of the queued work (flush_to_ldisc)
running in parallel and corrupting the free buffer list.

A cleaner fix for this is already
in the 2.6.18 rc series.

Thanks,
Paul

--
Paul Fulghum
Microgate Systems, Ltd.



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