New: strange observation, the queue depth is (64) meanwhile fw queue depth (65)

https://bugzilla.kernel.org/show_bug.cgi?id=74011

            Bug ID: 74011
           Summary: strange observation, the queue depth is (64) meanwhile
                    fw queue depth (65)
           Product: IO/Storage
           Version: 2.5
    Kernel Version: 3.2 to 3.14.0
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: SCSI
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

Created attachment 132121
--> https://bugzilla.kernel.org/attachment.cgi?id=132121&action=edit
System information

I get this error on the disk containing the root partition
This happens on recent kernels, but not on the 2.6.32.61 kernel. The code generating these messages is however identical in 2.6.32.61 and newer kernels.
This doesn't especially happen when the system is under high load.

This happens on both our production and stand-by server. Production server was switched back to 2.6.32.61.

Attached file contains system information of the stand-by server running kernel 3.14.0 (cpuinfo.txt lspci.txt meminfo.txt proc_scsi_scsi.txt ver_linux.txt).

I can provide more info and perform tests if needed.

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