CRITICAL:

r218259 (stable/8): SWAP
There can be more than 0x20000000 swap meta blocks allocated if a swap-backed
md(4) device is used. Don't panic when deallocating such a device if swap
has been used.

RECOMMENDED:

r218429 (stable/8): ZFS
MFC r218180 (= fixed r218169):
For the ZFS kernel module, change the type of clock_t to int64_t.
The clock_t type in OpenSolaris is long (int64_t on amd64).
On FreeBSD clock_t is int32_t. The clock_t type is used in several places
in the ZFS code to store system uptime in milliseconds ("seconds * hz").
With hz=1000 we have a 32-bit integer overflow in 24 days, 20 hours,
31 minutes and 23.648 seconds. This has a user reported negative impact
on l2arc_feed_thread() and may cause unexpected results from other functions
using clock_t.

r218795 (stable/8): ZFS
For UIO_NOCOPY case of reading request on zfs vnode, which has vm object
attached, activate the page after the successful read, and free the page
if read was unsuccessfull.
Freshly allocated page is not on any queue yet, and not activating (or
deactivating) the page leaves it on no queue, excluding the page from
pagedaemon scans and making the memory disappeared until the vnode
reclaimed.

r216815 (stable/8): NFS
MFC r216565,r216631,r216632,r216633,r216774 (NFS fixes)

OPTIONAL:

r216927 (stable/8): ZFS
MFC r207745 (trasz):
Enforce RLIMIT_FSIZE in ZFS.
Note: original implementation without vn_rlimit_fsize (pre-r207662)