HP-UX 11i v2 Read Before Installing or Updating, December 2007

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Unable to Unload Driver Error Message
If the system has many DLKM modules that depend on
one another, whenever insf(1M) is executed, you may
encounter the following message in the
console/syslog/dmesg file:
"insf: Unable to unload the driver: pfil"
What To Do
You may safely ignore this message. There will be no
problems while working with the DLKM modules.