linux-kernel - Re: console issue since 3.6, console=ttyS1 hangs

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Date:   Fri, 4 Nov 2016 16:33:48 -0500
From:   Nathan Zimmer <nzimmer@....com>
To:     Peter Hurley <peter@...leysoftware.com>
Cc:     Nathan Zimmer <nzimmer@....com>, Sean Young <sean@...s.org>,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Cox <alan@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: console issue since 3.6, console=ttyS1 hangs

On Thu, Nov 03, 2016 at 06:25:46PM -0600, Peter Hurley wrote:
> On Wed, Nov 2, 2016 at 9:29 AM, Nathan Zimmer <nzimmer@....com> wrote:
> > On Mon, Oct 31, 2016 at 08:55:49PM -0600, Peter Hurley wrote:
> >> On Mon, Oct 31, 2016 at 2:27 PM, Sean Young <sean@...s.org> wrote:
> >> > On Sun, Oct 30, 2016 at 10:33:02AM -0500, Nathan wrote:
> >> >> I think this should be PNP0501 instead of PNP0c02.
> >> >> Once I alter that then when I boot the serial comes up on irq 3. However it
> >> >> still hangs.
> >> >> I'll keep digging.
> >> >
> >> > Well that's that theory out of the window. I'm not sure where to look now,
> >> > I would start by enabling as many as possible of the "kernel hacking" config
> >> > options and see if anything gets caught.
> >> >
> >> > Looking at your earlier messages, you have a collection of percpu allocation
> >> > failures. That might be worth resolving before anything else.
> >>
> >> Hi Nathan,
> >>
> >> Couple of questions:
> >> 1. Was login over serial console setup and working on SLES 11?  or was
> >> the 'console=ttyS1' only for debug output?
> >> I ask because console output doesn't use IRQs; iow, maybe the serial
> >> port w/ driver never actually worked.
> >> 2. Can you post dmesg for the SLES 11 setup?  That would show if there
> >> were probe errors even on that.
> >>
> >> An alternative that should be equivalent to your previous setup is to
> >> build w/ CONFIG_SERIAL_8250_PNP=n
> >> Seems like your ACPI BIOS is buggy, but also that something else is using IRQ 3?
> >>
> >> Regards,
> >> Peter Hurley
> >
> >
> >
> > 1) Yes I can confirm I used it to login sometimes.
> >
> > I built with CONFIG_SERIAL_8250_PNP=n and that seemed to work better, in that the system did not hang.
> > However I couldn't login on the serial and got these error messages, I suspect I broke something while trying different permutations.
> >
> > gdm[5206]: WARNING: GdmDisplay: display lasted 0.136636 seconds
> > gdm[5206]: WARNING: GdmDisplay: display lasted 0.180955 seconds
> > gdm[5206]: WARNING: GdmDisplay: display lasted 0.161415 seconds
> > gdm[5206]: WARNING: GdmLocalDisplayFactory: maximum number of X display failures reached: check X server log for errors
> >
> > It did boot all the way though.
> >
> > 2) attached log
> 
> So I'm confused where this leaves us.
> 
> In your OP, you claim to have gotten it working with a partial revert
> of commit 835d844d1a28 (but you didn't attach the partial revert so no
> one knows what you did); however, my suggestion should have been
> equivalent.

I apologize, if I was unclear.  Your suggestion of CONFIG_SERIAL_8250_PNP=n did successfully boot and provide messages
across the console, and yes is basically equivelent to the revert.
Those warnings I just noticed in the dmesg and they weren't there before.

> 
> Note that you have the serial port disabled in BIOS; that's why you're
> getting the probe error for PNP.
> 
> Regards,
> Peter Hurley


Now when you say its diabled in bios, how can I be sure and double check that?
These bios screens do not have any mention of PNP settings.
I am getting output over the console (via ipmi) until the boot hangs.

Nate