Creating an LVM snapshot in RHEL7 can render the system unbootable

Solution Verified - Updated -


  • After creating a new LVM snapshot in the root volume group, boot fails with errors like the following:

    [  183.741859] dracut-initqueue[259]: Warning: dracut-initqueue timeout - starting timeout scripts
    [  183.742024] dracut-initqueue[259]: Warning: Could not boot.
    [  183.811432] dracut-initqueue[259]: Warning: /dev/mapper/rhel_unused-root does not exist
    [  183.812162] dracut-initqueue[259]: Warning: /dev/rhel_unused/root does not exist
             Starting Dracut Emergency Shell...
    Warning: /dev/mapper/rhel_unused-root does not exist
    Warning: /dev/rhel_unused/root does not exist
    Generating "/run/initramfs/rdsosreport.txt"
    Entering emergency mode. Exit the shell to continue.
    Type "journalctl" to view system logs.
    You might want to save "/run/initramfs/rdsosreport.txt" to a USB stick or /boot
    after mounting them and attach it to a bug report.
  • After updating a RHEL 7 kernel or manually executing dracut, the initramfs no longer contains the dm-snapshot.ko module


  • Red Hat Enterprise Linux 7
  • rootfs on top of LVM

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