HEADSUP -- ZFS users

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Hi,

As some of you may have already noticed, I have accidentally
introduced a regression when implementing backward compatibility to
existing zfs binaries when importing a recent ZFS change as of
r268075, which will cause system to block on 'kmem arena' when running
_old_ zfs(8) binaries, due to an overlooked incompatibility of kernel
data structures.

If this happens, the quickest recovery method would be to roll back to
previous kernel by booting into single user mode, mount -uw /, then
copy /boot/kernel.old/* to /boot/kernel .

The compatibility code was tested against old kernel so if you are
doing 'make installkernel installworld' (NOT RECOMMENDED: new userland
is NOT guaranteed to work with old kernel) rather than booting to a
new kernel, then you would probably be unaffected.

I have a working fix and am testing it right now.  The fix will be
committed after I have done sufficient testing, and I'll send another
headsup once everything is settled.

Sorry for the inconvenience and thanks for your patience.

Cheers,
- -- 
Xin LI <delphij_at_delphij.net>    https://www.delphij.net/
FreeBSD - The Power to Serve!           Live free or die
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