Why is DB2 installFixpack in Purescale environment failing when entering cluster filesystem maintenance mode?

installFixpack command returns:

The fixpack installation failed during “entering cluster file system into maintenance mode” step with error “Failed to unload kernel extensions”

And the db2diag.log shows:

FUNCTION: DB2 UDB, high avail services,
GPFSCluster::unloadKernelExtensions, probe:1578
The output from the CFS call is not recognized.
DATA #1 : String, 34 bytes
Failed to unload kernel extensions


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