Re: [Xen-users] XenServer console displays bootup but can't receive keyboard input?

[Melody Bliss <melodybliss@xxxxxxxxx>]

On Thu, Mar 24, 2011 at 8:54 PM, Pandu Poluan <pandu@xxxxxxxxxxx> wrote:
> On Fri, Mar 25, 2011 at 10:50, Melody Bliss <melodybliss@xxxxxxxxx> wrote:
>> Hrm. Interesting.
>>
>> I believe hvc0 is your console on this VM and it looks like a getty is 
>> running.
>>
>> Have you tried killing the agetty on hvc0 (process 4143). It should
>> respawn. If it doesn't, send a -HUP signal to init. That should force
>> init to re-read /etc/inittab and respawn missing processes.
>>
>
> No joy.

hrm

> The console indeed shows agetty restarting by emitting a new set of
> lines "This is bla bla bla ... login:"
>
> But still no keyboard input.
>
>> You may need to trace the getty process and see what it's doing at the time.
>>
>
> Uhh... trace? You went over my head there... :-P

You can use strace (if it's installed) to see what a running process
is doing. An example on my subversion server.

(via ssh to svn)

--- 8< cut >8 ---
[root@svn ~]# ps auxww | grep getty
root     27371  0.0  0.1   3804   544 xvc0     Ss+  04:08   0:00
/sbin/agetty xvc0 9600 vt100-nav
root     27409  0.0  0.1  61156   716 pts/0    R+   04:14   0:00 grep getty
[root@svn ~]# strace -p 27371
Process 27371 attached - interrupt to quit
read(0, "\r", 1)                        = 1
uname({sys="Linux", node="svn.home.chezbliss.com", ...}) = 0
write(1, "\r\n", 2)                     = 2
open("/etc/issue", O_RDONLY)            = 3
...
...
uname({sys="Linux", node="svn.home.chezbliss.com", ...}) = 0
write(1, "svn.home.chezbliss.com", 22)  = 22
write(1, " login: ", 8)                 = 8
--- 8< cut >8 ---

The above was generated when I hit the enter key on the console

--- 8< cut >8 ---
[root@shark ~]# xm console svn

CentOS release 5.5 (Final)
Kernel 2.6.18-194.26.1.el5xen on an x86_64

svn.home.chezbliss.com login:
--- 8< cut >8 ---

This way, you can see exactly what the getty process is doing (or not
doing). From the sounds of it, it sounds like the device driver may
have a bug in it where it isn't correctly attaching to the input
stream. Unfortunately I don't know enough about the Xen console driver
internals to be able to point you to a solution to the problem, but
using strace may give some idea of where to start.

Mel

[...]


-- 
Melody Bliss
Usenix, SAGE and LOPSA Charter Member
Patron Member of the NRA

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