syzbot

kernel: protection fault trap, code=0
Stopped at      bpfdetach+0x40: movq    0(%r15),%r12
ddb> 
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
the kernel did not panic
ddb> trace
bpfdetach(ffff8000015bc800) at bpfdetach+0x40 sys/net/bpf.c:1770
if_detach(ffff8000015bc800) at if_detach+0x12b sys/net/if.c:1289
tun_clone_destroy(ffff8000015bc800) at tun_clone_destroy+0x2a2 sys/net/if_tun.c:343
if_clone_destroy(ffff80003c975cd0) at if_clone_destroy+0x1d5 sys/net/if.c:1479
sys_ioctl(ffff80002f0b1770,ffff80003c975ea0,ffff80003c975df0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80003c975ea0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c975ea0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd4cb40f0570, count: -7
ddb> show registers
rdi                                0
rsi                                0
rbp               0xffff80003c975bc0
rbx                                0
rdx                                0
rcx               0x4e9a4f97644bbefe
rax               0xffff80002f0b1770
r8                               0x2
r9                                 0
r10               0xdbc64efd0ab97db0
r11               0x1a4acf48169fe1cd
r12               0xdeaf0002deafbead
r13               0xffff8000015bcd80
r14               0xffff8000015bc800
r15               0xdeaf0002deafbead
rip               0xffffffff82b2a9d0    bpfdetach+0x40
cs                               0x8
rflags                       0x10246    __ALIGN_SIZE+0xf246
rsp               0xffff80003c975b90
ss                              0x10
bpfdetach+0x40: movq    0(%r15),%r12
ddb> show proc
PROC (syz-executor) tid=13622 pid=55869 tcnt=2 stat=onproc
    flags process=1000<SINGLEEXIT> proc=4080000<SUSPSINGLE,THREAD>
    runpri=32, usrpri=50, slppri=32, nice=20
    wchan=0x0, wmesg=, ps_single=0xffff80002f0b0fa8 scnt=1 ecnt=1
    forw=0xffffffffffffffff, list=0xffff80002f0b0fa8,0xffff80003c8edcc0
    process=0xffff8000ffff8018 user=0xffff80003c970000, vmspace=0xfffffd807ec5e730
    estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb>