I wanted to start an ubuntu virtual machine as follows in Knoppix 7.2.0DVD (booted with 'fromhd'):
root# qemu-system-x86_64 -cdrom ubuntu-12.04.3-dvd-amd64.iso
The iso image was read OK, with the ubuntu boot screen appearing in the vga display of the emulator. However the booting failed with the following message:
[ 29.044201] BUG: soft lockup - CPU#0 stuck for 23s! [swapper/0:1]
[ 53.044186] BUG: soft lockup - CPU#0 stuck for 22s! [swapper/0:1]
[ 89.044214] BUG: soft lockup - CPU#0 stuck for 23s! [swapper/0:1]
When the iso image is burned to a DVD, the ubuntu system boots up without a problem from the disk. And "qemu-system-x86_64" starts a Knoppix VM from iso without problems. So it appears that the ubuntu iso and the qemu behaves as expected individually.
Although this problem may reside well outside the domain of Knoppix per se, I hope I may receive advice on where to go from here. Thanks in advance for any help.
Dell R730xd 26 Port SFF 2x E5-2697v4 36-Cores H730 128GB Server 2x SFP 10G ENT
$490.00
Dell PowerEdge R620 Dual Intel Xeon E5-2697 v2 @2.70GHz 128GB RAM No HDD S110
$144.50
Dell R630 Server 2x E5-2620 V4 2.1GHz =16 Cores 128GB DDR4 1x 960GB 2x 1G 2x 10G
$345.00
Dell PowerEdge R720 Dual Intel Xeon E5-2620 @2.00GHz 64GB RAM No HDD H710
$114.50
Dell PowerEdge R730, 2 sinks, SystemBoard, 8 trays,H330,Idrac 8 exp, 2x750w Psu
$135.00
Dell PowerEdge R430 - E5-2640 v3 2.60GHz 16GB RAM - NO HDDs
$119.99
DELL R440 8-Bay Server with 2x Bronze 3104 CPU, 2x PSU H330 Raid | No Ram, HD
$359.00
Dell PowerEdge R620 Server - 256GB RAM, 2x8cCPU, 120Gb SSD/3x900Gb SAS, Proxmox
$320.00
DELL PowerEdge R730 Server 2x E5-2680v4 2.4GHz =28 Cores 64GB H730 4xRJ45
$318.00
Poweredge R730 96GB 2xE5-2640v4 2.4GHZ=20Cores 2x1.2TB SAS 12G H330
$331.47