Xen users - Nov 2011 - Messy "xm console" output and frequently not responding

Hi All,

I''m running several linux HVM guests on top of Xen 3.1.2 version. And
when
I use "xm console" to connect one guest machine, the message is messed
up
like below and after I hit "Enter" serveral times, the console stops
responding.

[root@est6 ~#
>                oot@est6 ~]#
>                            rot@test6 ~#
>                                         oot@st6 ~]# root@test6 ~]#
>                                                                   
root@est~]
>
> root@test ~]#

If I ssh into the guest, everything just looks fine. No warning message in
dmesg or /var/log/message.

Settings in guest /etc/inittab

co:2345:respawn:/sbin/agetty ttyS0 115200 vt100


Lines in guest /boot/grub/menu.lst

title Red Hat Enterprise Linux AS (2.6.9)
>          root (hd0,0)
>          kernel /boot/vmlinuz-2.6.9 ro root=/dev/hda1
> console=ttyS0,115200n8
>          initrd /boot/initrd-2.6.9.img

Other things I''ve tried. I checked xenstore setting, and this guest
domain
use /dev/pts/9 to communicate to guest serial interface. So I tried minicom
to communicate to guest using /dev/pts/9 device. And it still has the same
problem.

I highly suspect it has something to do with this guest''s terminal
setting,
because other Linux HVM guest''s console running on this host just
working
fine.

Guest''s terminal setting after ssh into it. Tried to change terminal
setting via "stty speed 115200" but still not working.

[root@test6 ~]# stty -a
> speed 38400 baud; rows 52; columns 144; line = 0;
> intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
eol2
> = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
> werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;
> -parenb -parodd cs8 -hupcl -cstopb cread -clocal -crtscts
> -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon
> -ixoff -iuclc -ixany -imaxbel
> opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0
> vt0 ff0
> isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop
> -echoprt echoctl echoke

Could anyone kindly provide some advice for me ? Thank you so much!

--
uni


_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

Hi All,

I''m running several linux HVM guests on top of Xen 3.1.2 version. And
when
I use "xm console" to connect one guest machine, the message is messed
up
like below and after I hit "Enter" serveral times, the console stops
responding.

 [root@est6 ~#
>               oot@est6 ~]#
>                            rot@test6 ~#
>                                         oot@st6 ~]# root@test6 ~]#
>                                                                   
root@est~]
>
> root@test ~]#

If I ssh into the guest, everything just looks fine. No warning message in
dmesg or /var/log/message.

Settings in guest /etc/inittab

co:2345:respawn:/sbin/agetty ttyS0 115200 vt100


Lines in guest /boot/grub/menu.lst

title Red Hat Enterprise Linux AS (2.6.9)
>          root (hd0,0)
>          kernel /boot/vmlinuz-2.6.9 ro root=/dev/hda1
> console=ttyS0,115200n8
>          initrd /boot/initrd-2.6.9.img

Other things I''ve tried. I checked xenstore setting, and this guest
domain
use /dev/pts/9 to communicate to guest serial interface. So I tried minicom
to communicate to guest using /dev/pts/9 device. And it still has the same
problem.

I highly suspect it has something to do with this guest''s terminal
setting,
because other Linux HVM guest''s console running on this host just
working
fine.

Guest''s terminal setting after ssh into it. Tried to change terminal
setting via "stty speed 115200" but still not working.

[root@test6 ~]# stty -a
> speed 38400 baud; rows 52; columns 144; line = 0;
> intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
eol2
> = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
> werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;
> -parenb -parodd cs8 -hupcl -cstopb cread -clocal -crtscts
> -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon
> -ixoff -iuclc -ixany -imaxbel
> opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0
> vt0 ff0
> isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop
> -echoprt echoctl echoke

Could anyone kindly provide some advice for me ? Thank you so much!

--
uni


_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

Resending this message in plain text.

Hi All,

I''m running several linux HVM guests on top of Xen 3.1.2 version. And
when I use "xm console" to connect one guest machine, the message is
messed up like below and after I hit "Enter" serveral times, the
console stops responding.

[root@est6 ~#
              oot@est6 ~]#
                           rot@test6 ~#
                                        oot@st6 ~]# root@test6 ~]#
                                                                   root@est ~]

        root@test ~]#

If I ssh into the guest, everything just looks fine. No warning
message in dmesg or /var/log/message. Another thing I''ve tried is
using minicom to communicate to guest domain via /dev/pts/9, which is
listed in this guest''s xenstore setting. And minicom still shows the
same problem.

I highly suspect it has something to do with this guest''s terminal
setting, because other Linux HVM guest''s console running on this host
just working fine. Could anyone kindly provide some advice for me ?
Thank you so much!

Following settings for your reference
--
Settings in guest /etc/inittab

                co:2345:respawn:/sbin/agetty ttyS0 115200 vt100

Lines in guest /boot/grub/menu.lst

                title Red Hat Enterprise Linux AS (2.6.9)
                         root (hd0,0)
                         kernel /boot/vmlinuz-2.6.9 ro root=/dev/hda1
console=ttyS0,115200n8
                         initrd /boot/initrd-2.6.9.img

Guest''s terminal setting after ssh into it. Tried to change terminal
setting via "stty speed 115200" but still not working.

[root@test6 ~]# stty -a
speed 38400 baud; rows 52; columns 144; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
eol2 = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;
-parenb -parodd cs8 -hupcl -cstopb cread -clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl
ixon -ixoff -iuclc -ixany -imaxbel
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop
-echoprt echoctl echoke

--
uni

_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

Hi All,

I''m running several linux HVM guests on top of Xen 3.1.2 version. And
when I use "xm console" to connect one guest machine, the message is
messed up like below and after I hit "Enter" serveral times, the
console stops responding.

[root@est6 ~#
              oot@est6 ~]#
                           rot@test6 ~#
                                        oot@st6 ~]# root@test6 ~]#
                                                                   root@est ~]

        root@test ~]#

If I ssh into the guest, everything just looks fine. No warning
message in dmesg or /var/log/message. Another thing I''ve tried is
using minicom to communicate to guest domain via /dev/pts/9, which is
listed in this guest''s xenstore setting. And minicom still shows the
same problem.

I highly suspect it has something to do with this guest''s terminal
setting, because other Linux HVM guest''s console running on this host
just working fine.

Could anyone kindly provide some advice for me? Thank you so much!

Following settings for your reference
--
Settings in guest /etc/inittab

               co:2345:respawn:/sbin/agetty ttyS0 115200 vt100

Lines in guest /boot/grub/menu.lst

               title Red Hat Enterprise Linux AS (2.6.9)
                        root (hd0,0)
                        kernel /boot/vmlinuz-2.6.9 ro root=/dev/hda1
console=ttyS0,115200n8
                        initrd /boot/initrd-2.6.9.img

Guest''s terminal setting after ssh into it. Tried to change terminal
setting via "stty speed 115200" but still not working.

[root@test6 ~]# stty -a
speed 38400 baud; rows 52; columns 144; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
eol2 = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;
-parenb -parodd cs8 -hupcl -cstopb cread -clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl
ixon -ixoff -iuclc -ixany -imaxbel
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop
-echoprt echoctl echoke

--
uni

_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

On 14/11/2011 02:57, unicell wrote:
> [root@est6 ~#
>                oot@est6 ~]#
>                             rot@test6 ~#
>                                          oot@st6 ~]# root@test6 ~]#
>                                                                    
root@est ~]
>
>          root@test ~]#
>
>
This is to do with the newline character being different between *nix 
and Windows bases systems. Try fiddling with your terminal program and 
see if this helps.

I have to say, that I''ve never experienced this problem before on Xen, 
only when hacking around with embedded hardware...

Not sure about the not responding part. Make sure that you only have one 
console open at a time per DomU

_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

Thank you Jonathan. Actually I''ve already tried both putty and
SecureCRT as
terminal program, but still the same.

And it stops responding after sever hit several "Enter" key, even if
one
console opened at once. However, if I open several console at the same
time, one console stops responding will bring another console back. Hit
"Enter" again several times on that usable console, it stops
responding
again. But one out of opened consoles will response... Still got no clue...
:(

--
uni


On Tue, Nov 15, 2011 at 3:05 AM, Jonathan Tripathy
<jonnyt@abpni.co.uk>wrote:
>
> On 14/11/2011 02:57, unicell wrote:
>
>> [root@est6 ~#
>>               oot@est6 ~]#
>>                            rot@test6 ~#
>>                                         oot@st6 ~]# root@test6 ~]#
>>
>>  root@est ~]
>>
>>         root@test ~]#
>>
>>
>>  This is to do with the newline character being different between *nix
> and Windows bases systems. Try fiddling with your terminal program and see
> if this helps.
>
> I have to say, that I''ve never experienced this problem before on
Xen,
> only when hacking around with embedded hardware...
>
> Not sure about the not responding part. Make sure that you only have one
> console open at a time per DomU
>

_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

On Mon, Nov 14, 2011 at 7:54 PM, unicell <unicell@gmail.com>
wrote:
> Thank you Jonathan. Actually I''ve already tried both putty and
SecureCRT as
> terminal program, but still the same.
> And it stops responding after sever hit several "Enter" key, even
if one
> console opened at once. However, if I open several console at the same
time,
> one console stops responding will bring another console back. Hit
"Enter"
> again several times on that usable console, it stops responding again. But
> one out of opened consoles will response... Still got no clue... :(
>
There is typically only one shared Xen console for PV guest.  Are you
already running the PV drivers on your HVM guest?

http://wiki.xen.org/wiki/XenLinuxPVonHVMdrivers

As for another debugging idea. Maybe you could try to instrument the
xenconsole code.

Hope that helps.

Thanks,
Todd

-- 
Todd Deshane
http://www.linkedin.com/in/deshantm
http://www.xen.org/community/xenday11.html
http://cloudstack.org/about-cloudstack/cloudstack-events/viewevent/29-build-an-open-source-cloud-day-boston.html

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