Bug 674530

Description of problem:

I am trying to install a very old version of RHL (7.3) which comes
on several CDs.  During installation I have to "swap" the ISO at
least once.

After swapping ISO for the first time, the installation fails.  It
appears that the size of the second ISO (that the guest sees) is
truncated to the size of the first ISO.  This causes I/O errors
when the guest tries to read any file which is beyond the end of
the first ISO's size.

This might be an unresolvable error in the ancient guest kernel,
but I think it is worth investigating that it's not a bug in
the hypervisor.

Version-Release number of selected component (if applicable):

qemu-0.13.0-1.fc14.x86_64
kernel-2.6.35.10-74.fc14.x86_64 (host)
libvirt-0.8.3-2.rwmj1.fc14.x86_64 (0.8.3 + watchdog fix)
python-virtinst-0.500.4-1.fc14.noarch
virt-manager-0.8.5-1.fc14.noarch

Guest kernel is 2.4.18-3BOOT i686 from RHL 7.3 install disk.

How reproducible:

Tried it once.

Steps to Reproduce:
1. Try to install RHL 7.3 from
   ftp://archive.download.redhat.com/pub/redhat/linux/7.3/en/iso/i386/
2. When it says "insert disk 2", swap ISO using virt-manager
   (ie. disconnect + connect)

Actual results:

Guest gives lots of error messages:
attempt to access beyond end of device
16:00: rw=0, want=653346, limit=652832
^                         ^
|                         |
|       limit reflects size of the original ISO, see below
|
16:00 is major=22, minor=0 which is /dev/hdc

Expected results:

No errors.

Additional info:

These are the sizes of the ISO files:

-rw-rw-r--.  1 qemu   qemu   668499968 Feb  1 23:24 valhalla-i386-disc1.iso
-rw-rw-r--.  1 qemu   qemu   669319168 Feb  2 01:48 valhalla-i386-disc2.iso

Notice that 652832 * 1024 = 668499968 which is the size of
the first disk (yet this error occurs when the second disk is
"inserted").