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  • Fix "RHEL: Kernel will not boot, system freeze at 'starting udev'"

    Linux machine does not boots and gets stucked at udev prompt

    This is a known bug in Red Hat. Please follow the belw link to reach out the bug details
    Bug 645940 - Kernel will not boot, just sits at 'starting udev'

    Clocksource is the name of the new time keeping subsystem introduced in linux 2.6 kernel. In the subsystem there are several clock sources that can be used to read the time. One of them is the tsc clocksource which uses the time stamp counter that is present on each processor and can be used to track how much time has elapsed. The TSCs on the different processor are not necessarily perfectly in sync with each other so time can appear to go backward if the TSC is read on one processor and then another processor. Early version of the TScs clock source did not handle this case, which can be lead to the guest operating system not responding. Due to the different timing behavior of running in a virtual machine this can be observed more frequently.

    Append clocksource=acpi_pm in your grub.conf file with the kernel entry as shown in below screenshots

    Follow the screenshots

    Press the 'e' button to goto the edit option

    Go to the kernel option and again press 'e' and add the following at the end of the line

    Press enter to save and hit 'b' to boot your machine.

    Make sure to add this entry in your grub.conf file to avoid future issues in the machine
    # vi /etc/grub.conf
    title CentOS Linux Server (2.6.18-238.el5PAE)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-238.el5PAE ro root=LABEL=/ rhgb quiet 
        initrd /initrd-2.6.18-238.el5PAE.img

    Follow the below links for more tutorials

    Tutorial for Monitoring Tools SAR and KSAR with examples in Linux
    How to configure Samba 4 Secondary Domain Controller
    How does a DNS query works when you type a URL on your browser?
    How to secure Apache web server in Linux using password (.htaccess)
    How to register Red Hat Linux with RHN (Red Hat Network )
    Red hat Enterprise Linux 5.5 Installation Guide (Screenshots)
    15 tips to enhance security of your Linux machine
    Why is Linux more secure than windows and any other OS
    What is the difference between "su" and "su -" in Linux?
    What is swappiness and how do we change its value?
    How to log iptables messages in different log file
    What are the s and k scripts in the etc rcx.d directories
    How to check all the currently running services in Linux
    How to auto start service after reboot in Linux
    What is virtual memory, paging and swap space?

    Deepak Prasad

    is a techie and an author who is still trying to survive in this IT generation with very little knowledge he has on Linux/Unix, VMware, SAN Storage, Automation, networking etc

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    Fix "RHEL: Kernel will not boot, system freeze at 'starting udev'" Fix "RHEL: Kernel will not boot, system freeze at 'starting udev'" Reviewed by Deepak Prasad on Saturday, February 15, 2014 Rating: 5

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