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Date: Thu, 18 Jul 2002 21:32:08 +0100
From: Matthew Wilcox <willy@debian.org>
To: William Lee Irwin III <wli@holomorphy.com>,
       Matthew Wilcox <willy@debian.org>, linux-kernel@vger.kernel.org
Cc: jsimmons@transvirtual.com
Subject: Re: 2.5.26 broken on headless boxes
Message-ID: <20020718213208.P13352@parcelfarce.linux.theplanet.co.uk>
References: <20020717165538.D13352@parcelfarce.linux.theplanet.co.uk> <20020718010617.GL1096@holomorphy.com> <20020718142946.L13352@parcelfarce.linux.theplanet.co.uk> <20020718201857.GS1096@holomorphy.com>
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On Thu, Jul 18, 2002 at 01:18:57PM -0700, William Lee Irwin III wrote:
> On Thu, Jul 18, 2002 at 02:29:46PM +0100, Matthew Wilcox wrote:
> >>>EIP; c01b7695 <visual_init+85/e0>   <=====
> >>>edx; f7906600 <END_OF_CODE+37502e5c/????>
> >>>edi; c03dcc00 <vc_cons+0/fc>
> >>>esp; c3d45e7c <END_OF_CODE+39426d8/????>
> > Trace; c01b7773 <vc_allocate+83/140>
> > Trace; c01baa25 <con_open+19/88>
> > Trace; c01ac08c <tty_open+20c/394>
> > Trace; c0145a83 <link_path_walk+683/874>
> > Trace; c0144ed7 <permission+27/2c>
> > Trace; c0146373 <may_open+5f/2ac>
> > Trace; c013c33a <chrdev_open+66/98>
> > Trace; c013b001 <dentry_open+e1/1b0>
> > Trace; c013af16 <filp_open+52/5c>
> > Trace; c013b307 <sys_open+37/74>
> > Trace; c0108893 <syscall_call+7/b>
> 
> This is the 4th one of these I've seen in the last two days. Any chance
> of being able to compile with -g and get an addr2line on the EIP? I've
> tried to reproduce it myself, but haven't gotten it to happen yet.

seems fairly obvious what's happening with a couple of printks...

    printk("visual_init: sw = %p, conswitchp = %p, currcons = %d, init = %d\n",
                    sw, conswitchp, currcons, init);

gets me the interesting fact that sw & conswitchp are both NULL.
later on, we call:
    sw->con_init(vc_cons[currcons].d, init);
which seems like it would be the exact cause, no?

now whether putting a:

	if (!sw)
		return;

call into visual_init or whether we should determine earlier never to
call visual_init, I don't know.  The people who know about the console
have been conspicuously silent so far...

-- 
Revolutions do not require corporate support.
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