Bug 735993

Summary:	configuring a SCSI cd-rom in an HVM domain messes up IDE drives
Product:	Red Hat Enterprise Linux 5	Reporter:	Paolo Bonzini <pbonzini>
Component:	xen	Assignee:	Paolo Bonzini <pbonzini>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	5.7	CC:	leiwang, mrezanin, qguan, qwan, xen-maint, yuzhou
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	xen-3.0.3-134.el5	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-02-21 05:55:54 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Bug Depends On:
Bug Blocks:	699616

Description Paolo Bonzini 2011-09-06 11:37:02 UTC

When adding a disk with sda:cdrom to an HVM domain, the media type is set on the wrong disk: sda-sdd set the media type on hda-hdd, while from sde on the actual disk is off by 4 (i.e. sde sets it on sda and so on).

This is bad because adding a SCSI cd-rom can make the whole domain unbootable or crash qemu-dm.

* configuration for unbootable domain:

disk = ["file:/var/lib/xen/hvm.img,hda,w", "file:/var/lib/xen/cd.iso,sda:cdrom,r"]
boot = "c"

(hda becomes a CD-ROM and it is excluded from the boot sequence)

* configuration for qemu-dm crash:

disk = ["file:/var/lib/xen/hvm.img,hda,w", "file:/var/lib/xen/cd.iso,sdb:cdrom,r"]

(the hint is set on sdb and this causes a NULL-pointer dereference).

The bug is present since "always".

Comment 2 Miroslav Rezanina 2011-09-07 11:45:36 UTC

Fix built into xen-3.0.3-134.el5

Comment 5 Yuyu Zhou 2011-12-01 03:28:28 UTC

reproduce the bug on xen-3.0.3-132.el5 and verify the bug on xen-3.0.3-135.el5.

on xen-3.0.3-132.el5, 

boot the HVM guest with configure:

disk = ["file:/var/lib/xen/hvm.img,hda,w",
"file:/var/lib/xen/cd.iso,sda:cdrom,r"]
boot = "c"

In fact, no guest is created.

boot the HVM guest with configure:

disk = ["file:/var/lib/xen/hvm.img,hda,w",
"file:/var/lib/xen/cd.iso,sdb:cdrom,r"]

the guest fail to boot.

on xen-3.0.3-135.el5:
boot the guest with both configure will succeed, and the content of iso can be seen in the guest.

So change the bug to VERIFIED.

Comment 6 errata-xmlrpc 2012-02-21 05:55:54 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2012-0160.html