[Bug 263704] Panic because device went away with XPT_ATA_IO pending

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263704

            Bug ID: 263704
           Summary: Panic because device went away with XPT_ATA_IO pending
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: imp@FreeBSD.org

we can drop all references to the device (causing us to go through
camperiphfree and destroy the path) while we have an I/O pending in the ata_da
state machine (usually in state ADA_STATE_RAHEAD with ATA_SETFEATURES
ATA_SF_ENAB_RCACHE command). It's not clear why the reference that we take out
to do the reprobe isn't effective at blocking this. By retrying this condition,
though we avoid this bug (at least more often, I don't have a good reproduction
test case, I just see this panic a few times a month at work on systems that
have transient disk errors on ahci connected SATA SSDs).

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