Xen users - Sep 2006 - Error on DomU with xencons=ttyS

Hi all,

I have a question on /etc/inittab for DomU booted with xencons parameter.

I saw the following error messages when I appended xencons=ttyS to DomU
boot option.

  INIT: Id "1" respawning too fast: disabled for 5 minutes
  INIT: Id "2" respawning too fast: disabled for 5 minutes
  INIT: Id "4" respawning too fast: disabled for 5 minutes
  INIT: Id "3" respawning too fast: disabled for 5 minutes
  INIT: Id "5" respawning too fast: disabled for 5 minutes
  INIT: Id "6" respawning too fast: disabled for 5 minutes

"Xen 3.0 Users'' Manual" says that xencons=ttyS attaches the
console to
/dev/ttyS0.

The direct cause of this error is that mingetty ended on abnormal status
immediately.
mingetty was logging the following message. I checked the source codes
and found that this message was logged when opening /dev/tty1 failed on
ENXIO.

  /bin/mingetty[2399]: tty1: cannot open tty: No such device or address

I confirmed that removing tty1-tty6 from /etc/inittab stopped the error.
But I wonder if it is a proper way to not let the error occur.
In my view, this error should not occur even if tty1-tty6 are in
/etc/inittab because vanilla linux needs no modification of /etc/inittab
even though it uses a serial console.


Best regards,
Katsuhito Minai




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On Wed, 2006-09-20 at 08:38 +0900, MINAI Katsuhito
wrote:
> Hi all,
> 
> I have a question on /etc/inittab for DomU booted with xencons parameter.
> 
> I saw the following error messages when I appended xencons=ttyS to DomU
> boot option.
> 
>   INIT: Id "1" respawning too fast: disabled for 5 minutes
>   INIT: Id "2" respawning too fast: disabled for 5 minutes
>   INIT: Id "4" respawning too fast: disabled for 5 minutes
>   INIT: Id "3" respawning too fast: disabled for 5 minutes
>   INIT: Id "5" respawning too fast: disabled for 5 minutes
>   INIT: Id "6" respawning too fast: disabled for 5 minutes
This looks suspiciously like the error associated with a stopped or
troubled xfs service when booting in runlevel 5 in Red Hat / Fedora.

Why this would appear in a serial console, I don''t know. When
I''ve seen
this error in a regular system, I boot into another runlevel (1 or 3)
and fix xfs.


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On Wed, 20 Sep 2006, MINAI Katsuhito wrote:
>  INIT: Id "1" respawning too fast: disabled for 5 minutes
...
> "Xen 3.0 Users'' Manual" says that xencons=ttyS attaches
the console to
> /dev/ttyS0.
> The direct cause of this error is that mingetty ended on abnormal status
> immediately.
> mingetty was logging the following message. I checked the source codes
> and found that this message was logged when opening /dev/tty1 failed on
> ENXIO.
>
>  /bin/mingetty[2399]: tty1: cannot open tty: No such device or address

/dev/tty1-6 are  your virtual consoles (on a regular linux box, pres 
alt-f1, alt-f2, etc, to reach the other consoles)  Xen only supports one 
console.  (for xm console)  so when init tries to start getty on one of 
the other, non-existant consoles, it fails, and attempts to re-start over 
and over again (thus the respawning to fast error.)


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On Tue, 19 Sep 2006 17:11:04 -0700 (PDT)
Luke Crawford <lsc@prgmr.com> wrote:
> >
> >  /bin/mingetty[2399]: tty1: cannot open tty: No such device or address
> 
> 
> /dev/tty1-6 are  your virtual consoles (on a regular linux box, pres 
> alt-f1, alt-f2, etc, to reach the other consoles)  Xen only supports one 
> console.  (for xm console)  so when init tries to start getty on one of 
> the other, non-existant consoles, it fails, and attempts to re-start over 
> and over again (thus the respawning to fast error.)
Thanks for your comment.

I know behavior of init.
But I understand that DomU is the same as Vanilla Linux 
except some part of a kernel. 
So I think that /etc/inittab should be the same as Vanilla Linux.
Is my view right?


Best regards,
Katsuhito Minai




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