panic: unhandled af 254
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*470949  48474      0           0  0x4000000    0  syz-executor.1
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff821b8806) at panic+0x15c sys/kern/subr_prf.c:207
unhandled_af(fe) at unhandled_af+0x16
pf_addrcpy(ffff80001f474d98,ffff80001f475090,fe) at pf_addrcpy+0x99 sys/net/pf.c:409
pfioctl(4900,c0504417,ffff80001f475090,1,ffff80001d40f3d8) at pfioctl+0x43c0 sys/net/pf_ioctl.c:1827
VOP_IOCTL(fffffd805d66e1a0,c0504417,ffff80001f475090,1,fffffd806c3be8a0,ffff80001d40f3d8) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291
vn_ioctl(fffffd806696bac8,c0504417,ffff80001f475090,ffff80001d40f3d8) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533
sys_ioctl(ffff80001d40f3d8,ffff80001f4751a8,ffff80001f4751f0) at sys_ioctl+0x5b9
syscall(ffff80001f475270) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x9e379195010, count: 5
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports.  Insufficient info makes it difficult to find and fix bugs.
ddb> 
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
unhandled af 254
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff821b8806) at panic+0x15c sys/kern/subr_prf.c:207
unhandled_af(fe) at unhandled_af+0x16
pf_addrcpy(ffff80001f474d98,ffff80001f475090,fe) at pf_addrcpy+0x99 sys/net/pf.c:409
pfioctl(4900,c0504417,ffff80001f475090,1,ffff80001d40f3d8) at pfioctl+0x43c0 sys/net/pf_ioctl.c:1827
VOP_IOCTL(fffffd805d66e1a0,c0504417,ffff80001f475090,1,fffffd806c3be8a0,ffff80001d40f3d8) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291
vn_ioctl(fffffd806696bac8,c0504417,ffff80001f475090,ffff80001d40f3d8) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533
sys_ioctl(ffff80001d40f3d8,ffff80001f4751a8,ffff80001f4751f0) at sys_ioctl+0x5b9
syscall(ffff80001f475270) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x9e379195010, count: -10
ddb> show registers
rdi               0xffffffff8147cb17    db_enter+0x17
rsi                            0xb92
rbp               0xffff80001f474c50
rbx               0xffff80001f474d00
rdx                            0xb93
rcx               0xffff80001f259000
rax               0xffff80001f259000
r8                0xffff80001f474c10
r9                               0x1
r10               0xffff8000009ded00
r11               0xb3e842db39fb8983
r12                     0x3000000008
r13               0xffff80001f474c60
r14                            0x100
r15                              0x1
rip               0xffffffff8147cb18    db_enter+0x18
cs                               0x8
rflags                         0x246
rsp               0xffff80001f474c40
ss                              0x10
db_enter+0x18:  addq    $0x8,%rsp
ddb> show proc
PROC (syz-executor.1) pid=470949 stat=onproc
    flags process=0 proc=4000000<THREAD>
    pri=82, usrpri=82, nice=20
    forw=0xffffffffffffffff, list=0xffff80001d40e508,0xffffffff8254aeb8
    process=0xffff80001d39a6e8 user=0xffff80001f470000, vmspace=0xfffffd806748eab0
    estcpu=36, cpticks=0, pctcpu=0.0
    user=0, sys=0, intr=0
ddb>