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Date: Tue, 5 Jul 2005 12:21:54 +0400
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Poul-Henning Kamp <phk@phk.freebsd.dk>
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Cc: freebsd-current@freebsd.org, Roman Kurakin <rik@cronyx.ru>
Subject: Re: TTY code problems in current
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On Mon, Jul 04, 2005 at 02:37:52PM +0200, Poul-Henning Kamp wrote:

> In message <42C925A5.8060901@cronyx.ru>, Roman Kurakin writes:
> >Hi,
> >
> >    I observe some problems with my driver in async mode.
> >One of the panics I see is in function putc() from tty_subr.c.
> >It seems that this panic due to the fact that clist is not protected
> >by any locks if driver works in smpsafe mode without Giant.
> >
> >    The panic occur beacuse of pointer modification (the new value
> >of the pointer eq. to NULL.
> >Any comments?
> 
> We do not support smpsafe tty drivers yet.

IMHO, this problem related to sio (or puc) too.
I got 'clist reservation botch' on SMP kernel.