13.1-beta2 panic: page fault when utilizing iovctl(8) on ixl(4)

Hello,

this is most basic 13.1-BETA2 setup, no debug tools yet, just deployed 
to do a quick ixlv(4) test:

Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 02
fault virtual address    = 0x54
fault code        = supervisor read data, page not present
instruction pointer    = 0x20:0xffffffff8111d22b
stack pointer            = 0x28:0xfffffe0199c27870
frame pointer            = 0x28:0xfffffe0199c278b0
code segment        = base 0x0, limit 0xfffff, type 0x1b
             = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags    = interrupt enabled, resume, IOPL = 0
current process        = 2908 (iovctl)
trap number        = 12
panic: page fault
cpuid = 2
time = 1647885762
KDB: stack backtrace:
#0 0xffffffff80c69345 at kdb_backtrace+0x65
#1 0xffffffff80c1b9bf at vpanic+0x17f
#2 0xffffffff80c1b833 at panic+0x43
#3 0xffffffff810addf5 at trap_fatal+0x385
#4 0xffffffff810ade4f at trap_pfault+0x4f
#5 0xffffffff810851c8 at calltrap+0x8
#6 0xffffffff8111d4c6 at ixl_reconfigure_filters+0x66
#7 0xffffffff8112b177 at ixl_vf_setup_vsi+0x3e7
#8 0xffffffff8112ac84 at ixl_if_iov_vf_add+0x1c4
#9 0xffffffff80d488ed at iflib_device_iov_add_vf+0x8d
#10 0xffffffff8086e827 at pci_iov_ioctl+0x1497
#11 0xffffffff80ab4ec6 at devfs_ioctl+0xc6
#12 0xffffffff80d0ccb4 at vn_ioctl+0x1a4
#13 0xffffffff80ab557e at devfs_ioctl_f+0x1e
#14 0xffffffff80c8968b at kern_ioctl+0x25b
#15 0xffffffff80c89391 at sys_ioctl+0xf1
#16 0xffffffff810ae6ec at amd64_syscall+0x10c
#17 0xffffffff81085adb at fast_syscall_common+0xf8
Uptime: 5m8s


__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
55    /usr/src/sys/amd64/include/pcpu_aux.h: No such file or directory.
(kgdb) bt
#0  __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
#1  doadump (textdump=<optimized out>) at 
/usr/src/sys/kern/kern_shutdown.c:399
#2  0xffffffff80c1b5bc in kern_reboot (howto=260) at 
/usr/src/sys/kern/kern_shutdown.c:487
#3  0xffffffff80c1ba2e in vpanic (fmt=0xffffffff811b2ef6 "%s", 
ap=<optimized out>) at /usr/src/sys/kern/kern_shutdown.c:920
#4  0xffffffff80c1b833 in panic (fmt=<unavailable>) at 
/usr/src/sys/kern/kern_shutdown.c:844
#5  0xffffffff810addf5 in trap_fatal (frame=0xfffffe019663a7b0, eva=84) 
at /usr/src/sys/amd64/amd64/trap.c:944
#6  0xffffffff810ade4f in trap_pfault (frame=0xfffffe019663a7b0, 
usermode=false, signo=<optimized out>, ucode=<optimized out>)
     at /usr/src/sys/amd64/amd64/trap.c:763
#7  <signal handler called>
#8  0xffffffff8111d22b in ixl_add_filter 
(vsi=vsi@entry=0xfffff802cf4d7800, macaddr=macaddr@entry=0x54 <error: 
Cannot access memory at address 0x54>,
     vlan=vlan@entry=-1) at /usr/src/sys/dev/ixl/ixl_pf_main.c:1147
#9  0xffffffff8111d4c6 in ixl_reconfigure_filters 
(vsi=vsi@entry=0xfffff802cf4d7800) at 
/usr/src/sys/dev/ixl/ixl_pf_main.c:1118
#10 0xffffffff8112b177 in ixl_vf_setup_vsi 
(pf=pf@entry=0xfffffe015a672000, vf=vf@entry=0xfffff802cf4d7800) at 
/usr/src/sys/dev/ixl/ixl_pf_iov.c:218
#11 0xffffffff8112ac84 in ixl_if_iov_vf_add (ctx=<optimized out>, 
vfnum=0, params=0xfffff80003748840) at 
/usr/src/sys/dev/ixl/ixl_pf_iov.c:1799
#12 0xffffffff80d488ed in IFDI_IOV_VF_ADD (_ctx=0xfffff800031fec00, 
num_vfs=0, params=0xfffff80003748840) at ./ifdi_if.h:479
#13 iflib_device_iov_add_vf (dev=<optimized out>, vfnum=0, 
params=0xfffff80003748840) at /usr/src/sys/net/iflib.c:5684
#14 0xffffffff8086e827 in PCI_IOV_ADD_VF (dev=0xfffff80003404500, 
vfnum=0, config=0xfffff80003748840) at ./pci_iov_if.h:60
#15 pci_iov_enumerate_vfs (dinfo=0xfffff80003748840, 
config=0xfffff802cf91a8c0, first_rid=46352, rid_stride=1) at 
/usr/src/sys/dev/pci/pci_iov.c:665
#16 pci_iov_config (cdev=<optimized out>, arg=<optimized out>) at 
/usr/src/sys/dev/pci/pci_iov.c:761
#17 pci_iov_ioctl (dev=<optimized out>, cmd=<optimized out>, 
data=<optimized out>, fflag=<optimized out>, td=<optimized out>)
     at /usr/src/sys/dev/pci/pci_iov.c:986
#18 0xffffffff80ab4ec6 in devfs_ioctl (ap=0xfffffe019663abb8) at 
/usr/src/sys/fs/devfs/devfs_vnops.c:944
#19 0xffffffff80d0ccb4 in vn_ioctl (fp=0xfffff802cf4b1550, com=0, 
data=0xfffffe019663ad50, active_cred=0xfffff809308f2d00, td=0x0)
     at /usr/src/sys/kern/vfs_vnops.c:1694
#20 0xffffffff80ab557e in devfs_ioctl_f (fp=0xfffff80003404500, com=0, 
data=0xffffffff, cred=0xffffffff81250496, td=0xfffffe0162e42ac0)
     at /usr/src/sys/fs/devfs/devfs_vnops.c:875
#21 0xffffffff80c8968b in fo_ioctl (fp=0xfffff802cf4b1550, 
com=<optimized out>, data=0xffffffff, active_cred=0xffffffff81250496, 
td=0xfffffe0162e42ac0)
     at /usr/src/sys/sys/file.h:360
#22 kern_ioctl (td=0x0, fd=3, com=com@entry=2148560906, data=0xffffffff 
<error: Cannot access memory at address 0xffffffff>, 
data@entry=0xfffffe019663ad50 "")
     at /usr/src/sys/kern/sys_generic.c:803
#23 0xffffffff80c89391 in sys_ioctl (td=<optimized out>, 
uap=0xfffffe0162e42ea8) at /usr/src/sys/kern/sys_generic.c:711
#24 0xffffffff810ae6ec in syscallenter (td=0xfffffe0162e42ac0) at 
/usr/src/sys/amd64/amd64/../../kern/subr_syscall.c:189
#25 amd64_syscall (td=0xfffffe0162e42ac0, traced=0) at 
/usr/src/sys/amd64/amd64/trap.c:1185
#26 <signal handler called>
#27 0x000000080121b8ca in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffffffea48

ixl0@pci0:181:0:0:    class=0x020000 rev=0x04 hdr=0x00 vendor=0x8086 
device=0x37d2 subvendor=0x15d9 subdevice=0x37d2
     vendor     = 'Intel Corporation'
     device     = 'Ethernet Connection X722 for 10GBASE-T'
     class      = network
     subclass   = ethernet


cat /etc/iovctl.conf
PF    {
         device : "ixl0";
         num_vfs : 1;
     }

DEFAULT    {
         passthrough : true;
     }

VF-0    {
         mac-addr : "02:56:48:7e:d9:f7";
     }


Any help/hints highly appreciated!

-harry