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CONTAP-566111: Controller disruption during FlexGroup volume deletion with NFSv4 operations

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ontap-9
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Issue

A controller disruption can occur during deletion of a FlexGroup volume when NFSv4 operations are active. If an NFSv4 connection closes while ONTAP is processing a PUTFH operation, ONTAP may attempt to process a request that has already been released, resulting in the following panic:
page fault (supervisor read data, page not present) on VA 0xffffffffffffffff cs:rip 0x20:0xffffffffbd387503 rflags 0x10292

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