![]() This kind of error indicates that the initramfs file isn't generated, the GRUB configuration file has the initrd entry missing after a patching process, or a GRUB manual misconfiguration.īefore rebooting a server, we recommend validating the GRUB configuration and /boot contents if there's a kernel update by running one of the following commands. Kernel Offset: 0xc00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090008 "Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)" Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) You'll see any of the following error messages: You can identify this issue from the Azure serial console. It's most commonly seen in RHEL-based distributions. This error occurs because of a recent system update (kernel). Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) Follow the instructions in Reinstall GRUB and regenerate GRUB configuration file for the corresponding Linux distribution and VM generation. Regenerate the GRUB configuration file to apply the changes. For example, "1>2" is the third menuentry from the first submenu. As a reference: the top level menuentry value is 0, the first top level submenu value is 1, and each nested menuentry value starts with 0. ![]() This is a persistent change.įor more information about how to configure the GRUB_DEFAULT variable, see SUSE Boot Loader GRUB2 and Ubuntu Grub2/Setup. Press the down arrow key to select any previous kernel version.Ĭhange the GRUB_DEFAULT variable in the /etc/default/grub file as instructed in Change default kernel version manually. ![]() ![]() Press the ESCAPE key to interrupt your VM at the GRUB menu. Once the serial console connection resumes, you'll see a countdown counter at the left top corner of the serial console window.
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