[Bug 207667] Reproducable kernel panics whilst scrubbing a zvol pool...

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207667

--- Comment #8 from Benjamin Kaduk <bjk at FreeBSD.org> ---
(In reply to Michelle Sullivan from comment #7)

> That would make sense, but can't swap to zfs either (options there are file - which won't work (documented) or zvol which is not documented but trying it just gave an inappropriate ioctl when trying to add the dump dev) possibly the other thing I could do it take the hotspare device out of the pool and turn it into a sump dev... but really trying not to screw with the existing config....

Of those, I would only expect taking the hotspare out of the pool and using the
raw device for swap to provide a usable crash dump, but am not at the point of
recommending that you do so.

> Did you take a look at the photo of the console?  Does it seem interesting?  It is 100% reproducable and the panic is instant.

I did look at it, and it seems interesting, but unfortunately outside my area
of expertise.  Hopefully Andriy will take a look.

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