sorry to report that send/receive (see Aug. 18th/19th) still crashes when 
testing with more than 10GB of data:

panic[cpu1]/thread=ffffff000faf4c40:
BAD TRAP: type=e (#pf Page fault) rp=ffffff000faf4870 addr=68 occurred in 
module "zfs" due to a NULL pointer dereference
sched:
#pf Page fault
Bad kernel fault at addr=0x68
pid=0, pc=0xfffffffff7d49176, sp=0xffffff000faf4960, eflags=0x10202
cr0: 8005003b<pg,wp,ne,et,ts,mp,pe> cr4: 6f8<xmme,fxsr,pge,mce,pae,pse,de>
cr2: 68
cr3: 1dc00000
cr8: c

        rdi:               68 rsi: ffffff03dde12120 rdx: ffffff000faf4c40
        rcx:                d  r8: ffffff03db3662a0  r9:                0
        rax:                0 rbx: ffffff03dde12120 rbp: ffffff000faf4970
        r10: fffffffffb858740 r11: fffffffffb800983 r12:                0
        r13: ffffffffc001af00 r14: ffffffffc001e890 r15: ffffff03dde12120
        fsb:                0 gsb: ffffff03c9b89080  ds:               4b
         es:               4b  fs:                0  gs:              1c3
        trp:                e err:                0 rip: fffffffff7d49176
         cs:               30 rfl:            10202 rsp: ffffff000faf4960
         ss:               38

ffffff000faf4750 unix:real_mode_stop_cpu_stage2_end+b21c ()
ffffff000faf4860 unix:trap+e08 ()
ffffff000faf4870 unix:_cmntrap+e6 ()
ffffff000faf4970 zfs:arc_buf_remove+16 ()
ffffff000faf49b0 zfs:arc_buf_destroy_impl+bd ()
ffffff000faf4a10 zfs:arc_evict_hdr+b3 ()
ffffff000faf4aa0 zfs:arc_evict_state_impl+154 ()
ffffff000faf4b40 zfs:arc_evict_state+12e ()
ffffff000faf4b70 zfs:arc_adjust_impl+44 ()
ffffff000faf4ba0 zfs:arc_adjust+d9 ()
ffffff000faf4c20 zfs:arc_reclaim_thread+ae ()
ffffff000faf4c30 unix:thread_start+8 ()


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