[Bug 223238] Persistent iscsi underflow mismatch errors followed by apparent kernel panic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223238

--- Comment #6 from Edward Tomasz Napierala <trasz at FreeBSD.org> ---
The warnings on the initiator (FreeBSD) side mean that the NAS doesn't
correctly mark underflows.  It's a common bug and not something to worry about
(though still a protocol error).

The "Unsupported SCSI Opcode 0xb7" messages on the target (Synology) side mean
it doesn't support READ DEFECT DATA command.  That's ok too, and shouldn't
break anything.  I'm not sure what makes FreeBSD send the READ DEFECT DATA
command to the target.  Do you have some disk monitoring software enabled on
the initiator side?

As for the panic message - looking at the traceback it looks like panic in
mpt(4) driver, unrelated to iscsi(4).  It might be triggered by the same
software that triggers the READ DEFECT DATA on iSCSI.  Can you check which
process triggered the panic?  Basically, when you see the backtrace and panic
messages, press Scroll Lock and use cursor keys to scroll up; there should be
some more information there.

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