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CFNVRAM-36: panic due to received of unexpected NVRAM FPGA doorbell 0

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Issue

Unexpected reboot on storage controller.
Panic:page fault (supervisor read instruction, page not present) on VA 0 cs:rip 0x20:0 rflags 0x10206 in process swi1: mri_ha on release9.12.1P14 (C)

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