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CONTAP-172994: Controller has encountered a panic when it tried to free the block

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Issue

-Flash Cache become offline with following ASUP triggered:
-"HA Group Notification (Flash Cache NVMe Offline) ALERT"
-SYSCONFIG -A show Flash Cache become failed status.
slot 1: Flash Cache NVMe
Serial Number: ZEP0081C
Part Number: 119-00329
Hardware Revision: A0
Firmware Version: NA03
Model Name: X3311A
Capacity: 1024 GB
State: failed

  • Node panics with the following message and a takeover/giveback is performed automatically after Flash Cache offline:
    Panic_Message: Freeing freed block: pvbn x vvbn xxxxxx in volume xxxxxx@vserver:xxxxxxxx.

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