Bug 771624

Summary: guest fails with error: isa irq 4 already assigned when starting guest with more than two serial devices
Product: Red Hat Enterprise Linux 6 Reporter: Xiaomei Gao <xigao>
Component: qemu-kvmAssignee: Amit Shah <amit.shah>
Status: CLOSED ERRATA QA Contact: Virtualization Bugs <virt-bugs>
Severity: high Docs Contact:
Priority: urgent    
Version: 6.3CC: acathrow, bsarathy, cww, juzhang, michen, minovotn, mkenneth, nkim, rhod, shu, virt-maint, wquan
Target Milestone: rcKeywords: Patch, ZStream
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: qemu-kvm-0.12.1.2-2.297.el6 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2013-02-21 07:31:50 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: 806717, 840054    
Attachments:
Description Flags
Patch from Gerd Hoffmann none

Description Xiaomei Gao 2012-01-04 11:36:00 UTC 
Description of problem:
when starting guest with two serial options, it works well. However, when starting guest with more than two serial options, guest fails with error:isa irq 4 already assigned. Also, man qemu-kvm says "this option can be used several times to simulate up to 4 serial ports."

Version-Release number of selected component (if applicable):
# uname -r
  2.6.32-220.el6.x86_64
# rpm -qa| grep qemu-kvm
  qemu-kvm-0.12.1.2-2.213.el6.x86_64

How reproducible:
100%


Steps to Reproduce:
1.boot a guest with two serial options
/usr/libexec/qemu-kvm -serial stdio -serial unix:/tmp/example,server,nowait
2.two serials work well
3.boot a guest with more than two serial options
/usr/libexec/qemu-kvm -serial stdio -serial unix:/tmp/example1,server,nowait -serial unix:/tmp/example2,server,nowait
4.guest fails with error:isa irq 4 already assigned
  
Expected results:
qemu-kvm should support 4 serial devices.

Additional info:
Comment 5 Neal Kim 2012-07-12 17:06:20 UTC 
Created attachment 597855 [details]
Patch from Gerd Hoffmann
Comment 12 Shaolong Hu 2012-10-26 05:26:51 UTC 
Verified with qemu-kvm-rhev-0.12.1.2-2.331.el6.x86_64:

[root@localhost nfs]# /usr/libexec/qemu-kvm -serial stdio -serial unix:/tmp/example1,server,nowait -serial unix:/tmp/example2,server,nowait
VNC server running on `::1:5900'
Comment 13 errata-xmlrpc 2013-02-21 07:31:50 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-2013-0527.html