Hi team!
Here's a case that There Is a Possibility that Red Hat Linux 6.4 Stops Responding During the Startup Process.
Symptom
There is a possibility that a Red Hat Linux 6.4 stops responding during the startup process and a blank screen is displayed.
Possible Causes
The kernel encounters a soft lock, and a blank screen is displayed when you use the VNC to view the VM.
Figure 1 shows the blank screen.
Figure1 Call stacks for a soft lock of the kernel
This problem is a known bug for earlier-version Linux kernels.
On the Red Hat Enterprise Linux 6.5 operating system, the bug does not exist.
This problem has been discussed at https://bugzilla.redhat.com/show_bug.cgi?id=643576.
Fault Diagnosis
View VM logs. Figure 2 shows the stack information about logs.
Figure1 Stack results of logs
Figure 3 shows the current running process of the VM that stops responding.
Figure1 Current running process of the VM
Figure 4 shows stacks of the process.
Figure1 Stacks for the IP process.
Handling Procedure
This bug does not exist on the Red Hat Enterprise Linux 6.5 operating system.
It is recommended that the Red Hat Enterprise Linux 6.5 or later versions be used.
There is a low probability that this problem is triggered.
If this problem occurs, you can forcibly restart the VM as follows:
1. Use the following command to forcibly shut down the VM on the host:
virsh destroy VMName
2. Use the following command to restart the VM on the host:
virsh start VMName
VMName indicates the name of a VM.
