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[Xen-bugs] [Bug 1522] New: Empty CD-ROM does not work with stubdom

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Subject: [Xen-bugs] [Bug 1522] New: Empty CD-ROM does not work with stubdom
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Date: Tue, 6 Oct 2009 16:33:48 -0700
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           Summary: Empty CD-ROM does not work with stubdom
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Tools
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: jw@xxxxxxxxxxxxxxxxxx

I am testing with the same configuration I listed in bug # 1372:
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1372, but with one
change -- the disk line is instead:

disk = [ 'file:/servers/customers/testvds.img,hda,w', ',hdc:cdrom,r' ]

When I try to start this domain, it shows no error, but "xm list" tells a
different story:

# xm list
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0 15290    16     r-----  34804.1
testvds                                     49   512     1     ------      0.0

.. with no stubdom shown at all. Looking at the auto-generated stubdom
configuration file, I can see the culprit is an extraneous colon:

# cat /etc/xen/stubdoms/testvds-dm
#This file is autogenerated, edit testvds instead!
kernel = '/usr/lib/xen/boot/ioemu-stubdom.gz'
vfb = ['sdl=0, opengl=1, xauthority=/root/.Xauthority, vnc=1, vncdisplay=29,
vnclisten=, vncunused=0, vncpasswd=test']
disk = [ 'file:/servers/customers/testvds.img,hda:disk,w',':,hdc:cdrom,r' ]
vif = [ 'mac=52:54:00:D6:BA:64,bridge=xenbr0' ]

I edited the stubdom-dm script to leave out the colon, and this allowed the
domain and stubdom to "start"; however, they then immediately freeze, showing
no CPU usage, just as though an invalid boot device were specified -- giving a
second component to this bug.

This bug should be very easy to reproduce, and hopefully easy to fix. I'm just
not sure where to look, beyond the stubdom-dm script.

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