Bug 758084

Summary: RHEL guest failed to boot into single user mode
Product: Red Hat Enterprise Linux 6 Reporter: Qunfang Zhang <qzhang>
Component: qemu-kvmAssignee: Virtualization Maintenance <virt-maint>
Status: CLOSED NOTABUG QA Contact: Virtualization Bugs <virt-bugs>
Severity: medium Docs Contact:
Priority: medium    
Version: 6.2CC: acathrow, bsarathy, juzhang, michen, mkenneth, virt-maint
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-12-07 08:26:19 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description Qunfang Zhang 2011-11-29 10:40:51 UTC 
Description of problem:
Boot a rhel6 or rhel5 guest,and then boot into single user mode by "init 1" or add "single" to kernel command line then reboot, guest stops and can not accept any input.

Version-Release number of selected component (if applicable):
kernel-2.6.32-220.el6.x86_64
qemu-kvm-0.12.1.2-2.209.el6

How reproducible:
Always

Steps to Reproduce:
1.Boot a RHEL guest.
/usr/libexec/qemu-kvm -M rhel6.2.0 -enable-kvm -m 1024 -smp 1,sockets=1,cores=1,threads=1 -name rhel6.2-64 -uuid b1af8ea9-8966-fd2a-6567-5ecbde68f116 -rtc base=utc -drive file=/root/RHEL-Server-6.2-64-virtio.qcow2,if=none,id=drive-ide0-0-0,format=qcow2,cache=none -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:8c:b4:ec,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -usb -vnc :10 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -drive file=/home/floppy.img,if=none,id=drive-fdc0-0-0,format=raw,cache=none -global isa-fdc.driveA=drive-fdc0-0-0 -monitor stdio

2.Add "single" to kernel command line.
3.Reboot guest to boot into the single user mode
  
Actual results:
Guest stops at reboot and can not boot into single user mode.

Expected results:
Guest should boot into single user mode.

Additional info:
Comment 1 Qunfang Zhang 2011-12-07 08:26:19 UTC 
Test the following 2 scenarios:
(1) Remove "console=tty0 console=ttyS0,115200" from guest kernel command line, and then boot into single user mode. => Succeed. 
(2) Add "console=tty0 console=ttyS0,115200" in guest kernel command line and boot into single user mode. Guest stops as bug description, but I can log into guest from the serial.
(Boot guest with serial device "-chardev socket,id=charserial0,path=/tmp/qzhang,server,nowait -device isa-serial,chardev=charserial0,id=serial0", using "nc -U /tmp/qzhang to connect the guest.)

Based on above, this is not a bug, close it. Please correct me if I am wrong.