Protocol failure detected during processing of FCP messages with lpfc driver

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Issue

I'm getting the following messages from the lpfc driver on my system

lpfc 0000:04:00.1: 1:(0):2757 Protocol failure detected during processing of FCP I/O op: tgt x1 lun x5 cmnd x2a rspInfo3 x3
lpfc 0000:27:00.1: 3:(0):2757 Protocol failure detected during processing of FCP I/O op: tgt x1 lun x3 cmnd x2a rspInfo3 x3

What does "Protocol failure detected during processing of FCP" means?

Environment

Red Hat Enterprise Linux 6.x

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