Bug 731583

Summary:	garbled console in interactive virsh session
Product:	Red Hat Enterprise Linux 6	Reporter:	Dave Allan <dallan>
Component:	libvirt	Assignee:	Daniel Berrangé <berrange>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	high	Docs Contact:
Priority:	high
Version:	6.2	CC:	dyuan, mzhan, rwu, vbian, veillard, ydu
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	libvirt-0.9.4-8.el6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-12-06 11:49:16 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Dave Allan 2011-08-17 21:37:14 UTC

If I enter and exit the console of a domain multiple times in one interactive virsh session, I see garbled console output that's consistent with multiple consoles being open at the same time.

0.9.4-4

Comment 2 Vivian Bian 2011-08-18 07:42:31 UTC

Dave , would  you please help confirm if the following stuff is the exact reproducer for this bug ? 

tested with libvirt-0.9.4-4

steps :
1. configure guest grub with "console=tty0 console=ttyS0,115200n8" appended in
the kernel command line 
2. configure guest with serial device added 
    <serial type='pty'>
      <source path='/dev/pts/5'/>
      <target port='0'/>
      <alias name='serial0'/>
    </serial>
3. start guest 
4. enter interactive mode of virsh 
   # virsh  
   Welcome to virsh, the virtualization interactive terminal.

Type:  'help' for help with commands
       'quit' to quit

virsh # console test1
Connected to domain test1
Escape character is ^]
�  Welcome to Red Hat Enterprise Linux Client
Starting udev: 
virsh # console test1
Connected to domain test1
Escape character is ^]

[/sbin/fsck
untin quotas:  
virsh # console test1
Connected to domain test1
Escape character is ^]
6_64 on an x86_646_64 on an x86_64x86_64 on an x86_64

After times of Enter-Exit loop , we get the garbled console output in
interactive virsh session . 

Additional info:
This can be only seen in virsh interactive mode .

Comment 3 Dave Allan 2011-08-22 12:16:47 UTC

Yes, that's exactly it.

Comment 7 Vivian Bian 2011-09-07 09:28:06 UTC

tested with 
libvirt-0.9.4-9.el6
qemu-kvm-0.12.1.2-2.185.el6
kernel-2.6.32-193.el6

steps :
1. configure guest grub with "console=tty0 console=ttyS0,115200n8" appended in
the kernel command line 
2. configure guest with serial device added 
    <serial type='pty'>
      <source path='/dev/pts/5'/>
      <target port='0'/>
      <alias name='serial0'/>
    </serial>
3. start guest 
4. enter interactive mode of virsh 
   # virsh  
   Welcome to virsh, the virtualization interactive terminal.

Type:  'help' for help with commands
       'quit' to quit

virsh # console test1
Connected to domain test1
Escape character is ^]

connect-disconnect loop won't make a garbled console output. 

So set bug status to VERIFIED

Comment 8 errata-xmlrpc 2011-12-06 11:49:16 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-2011-1513.html