[Bug 223803] zio_done() panic on system with cache devices

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223803

--- Comment #4 from Andriy Gapon <avg at FreeBSD.org> ---
Created attachment 188880
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=188880&action=edit
proposed patch

George Wilson has posted a prospective patch to the illumos bug report:
https://www.illumos.org/issues/8857

I am attaching a version of it adapted to FreeBSD.
I have't tested it myself yet.

The patch is against FreeBSD head.
Please let me know if there are any issues applying it to other branches.

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