RHEL kernel 2.6.32-642 failed to load the NFS kernel modules nfs.ko and nfsd.ko

Solution Verified - Updated -


  • Patching 4 servers which had NFS mounts resulted in kernel 2.6.32-642 being installed. Upon reboot this kernel failed to load the NFS kernel modules.

    kernel: lockd: Unknown symbol unregister_inet6addr_notifier
    kernel: lockd: Unknown symbol register_inet6addr_notifier
    modprobe: FATAL: Error inserting nfs (/lib/modules/2.6.32-642.el6.x86_64/kernel/fs/nfs/nfs.ko): Unknown symbol in module, or unknown parameter (see dmesg)


  • Red Hat Enterprise Linux 6
  • kernel 2.6.32-642.el6.x86_64 (NFS Client)

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.

Current Customers and Partners

Log in for full access

Log In