OK, this one get me another dump after a few hours:
panic[cpu2]/thread=fffffe44aab2c020:
BAD TRAP: type=e (#pf Page fault) rp=fffffe003d7615e0 addr=0 occurred in module
"zfs" due to a NULL pointer dereference
#pf Page fault
Bad kernel fault at addr=0x0
pid=114332, pc=0xfffffffff7d90366, sp=0xfffffe003d7616d0, eflags=0x10282
cr0: 8005003b<pg,wp,ne,et,ts,mp,pe> cr4:
1626f8<smep,osxsav,pcide,vmxe,xmme,fxsr,pge,mce,pae,pse,de>
cr2: 0
cr3: 7615fb000
cr8: 0
rdi: 0 rsi: fffffe2e33f7b808 rdx: fffffe44aab2c020
rcx: fffffe2e33f7b808 r8: 9ae16a3b2f90408f r9: 9ae16a3b2f90404f
rax: 2 rbx: fffffe2e33f7b808 rbp: fffffe003d761700
r10: fffffffffb87bd58 r11: 1 r12: 0
r13: 5 r14: fffffe2e33f7b808 r15: 8000000000
fsb: fffffc7fef053a40 gsb: fffffe2d373d7000 ds: 4b
es: 4b fs: 0 gs: 0
trp: e err: 0 rip: fffffffff7d90366
cs: 30 rfl: 10282 rsp: fffffe003d7616d0
ss: 38
CPU ADDRESS TIMESTAMP TYPE VC HANDLER PC
0 fffffffffbc2f488 44460127bfda sysc 36 ioctl fffffc7fef29876a
0 fffffffffbc2f310 44460127610b sysc 36 ioctl fffffc7fef29876a
0 fffffffffbc2f198 44460126c839 sysc 36 ioctl fffffc7fef29876a
0 fffffffffbc2f020 4446012673f6 sysc 36 ioctl fffffc7fef29876a
0 fffffffffbc2eea8 444601263a02 sysc 4d syslwp_park fffffc7fef291c84
0 fffffffffbc2ed30 44460124ce05 sysc 36 ioctl fffffc7fef29876a
0 fffffffffbc2ebb8 4446012457f0 sysc 36 ioctl fffffc7fef29876a
0 fffffffffbc2ea40 4446012048da sysc 36 ioctl fffffc7fef29876a
0 fffffffffbc3a4c8 444601164582 sysc 36 ioctl fffffc7fef29876a
0 fffffffffbc3a350 4446011607f6 sysc b7 pollsys fffffc7fef298a0a
1 fffffe2d373bde28 444601294139 intr f1 xc_serv 44e737
1 fffffe2d373bdcb0 4446010ad8cb intr f2 unknown 44e702
1 fffffe2d373bdb38 444600ca0ab6 sysc 18 getuid 7fffed8ea827
1 fffffe2d373bd9c0 444600adf294 intr 21 e1000g_intr_pcie 44e763
1 fffffe2d373bd848 444600a9b097 intr 21 e1000g_intr_pcie 44e72e
1 fffffe2d373bd6d0 4446007efaa0 intr f1 xc_serv 44e6fd
1 fffffe2d373bd558 4446007e2739 intr f1 xc_serv 44e779
1 fffffe2d373bd3e0 4446007dd460 intr f1 xc_serv 44e702
1 fffffe2d373bd268 4446007d6fce intr f1 xc_serv 44e702
1 fffffe2d373bd0f0 44460076754e intr f1 xc_serv 44e702
2 fffffe2d3740e0c8 44460129c7c8 trap e #pf arc_buf_destroy+26
2 fffffe2d3740df50 44460126e77c sysc ad pread fffffc7fef298a2a
2 fffffe2d3740ddd8 444601266c33 intr f2 unknown 4422dc
2 fffffe2d3740dc60 4446010adc73 intr f2 unknown 44e798
2 fffffe2d3740dae8 444600814f85 sysc 4d syslwp_park fffffc7fef291c57
2 fffffe2d3740d970 44460081149a sysc 25 kill fffffc7fef2987aa
2 fffffe2d3740d7f8 44460032a00b sysc 7b preadv fffffc7fef298a4a
2 fffffe2d3740d680 444600324b5d intr f2 unknown 44e702
2 fffffe2d3740d508 4446001b8a33 sysc 4d syslwp_park fffffc7fef291c57
2 fffffe2d3740d390 4446001b4cfc sysc 25 kill fffffc7fef2987aa
3 fffffe2d37489ff0 44460129410e intr f1 xc_serv 44e702
3 fffffe2d37489e78 4446010a7842 intr f6 cbe_fire 44e710
3 fffffe2d37489d00 4446007efccb intr f1 xc_serv 44e763
3 fffffe2d37489b88 4446007e2936 intr f1 xc_serv 44e748
3 fffffe2d37489a10 4446007dd679 intr f1 xc_serv 44e702
3 fffffe2d37489898 4446007d71c8 intr f1 xc_serv 44e763
3 fffffe2d37489720 44460076775a intr f1 xc_serv 44e763
3 fffffe2d374895a8 44460075d6ff intr f1 xc_serv 44e763
3 fffffe2d37489430 44460075a31a intr f1 xc_serv 44e798
3 fffffe2d374892b8 44460075641d intr f1 xc_serv 44e737
fffffe003d7614c0 unix:real_mode_stop_cpu_stage2_end+c854 ()
fffffe003d7615d0 unix:trap+148b ()
fffffe003d7615e0 unix:cmntrap+1ca ()
fffffe003d761700 zfs:arc_buf_destroy+26 ()
fffffe003d761750 zfs:dbuf_read_done+f8 ()
fffffe003d761870 zfs:arc_read+11ba ()
fffffe003d761940 zfs:dbuf_read_impl+6fe ()
fffffe003d7619d0 zfs:dbuf_read+fa ()
fffffe003d761a80 zfs:dmu_buf_hold_array_by_dnode+138 ()
fffffe003d761b20 zfs:dmu_read_uio_dnode+5a ()
fffffe003d761b80 zfs:dmu_read_uio+5b ()
fffffe003d761c10 zfs:zvol_read+172 ()
fffffe003d761c40 genunix:cdev_read+2d ()
fffffe003d761ce0 specfs:spec_read+263 ()
fffffe003d761d80 genunix:fop_read+f3 ()
fffffe003d761ef0 genunix:pread+1a2 ()
fffffe003d761f00 unix:brand_sys_syscall+320 ()
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