[Bug 266999] panic: make_dev_sv: bad si_name (error=17, si_name=tun3)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266999

            Bug ID: 266999
           Summary: panic: make_dev_sv: bad si_name (error=17,
                    si_name=tun3)
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: p.mousavizadeh@protonmail.com

FreeBSD Version:
% freebsd-version -ku
13.1-RELEASE-p2
13.1-RELEASE-p2

Steps to reproduce:
I do not know why this is happens. This happened multiple times and logs before
panic are not familiar. But the panic message is always the same with exception
of the tun* number.

panic message:
kernel: panic: make_dev_sv: bad si_name (error=17, si_name=tun2)
kernel: cpuid = 0
kernel: time = 1665591262
kernel: KDB: stack backtrace:
kernel: #0 0xffffffff80c694a5 at kdb_backtrace+0x65
kernel: #1 0xffffffff80c1bb5f at vpanic+0x17f
kernel: #2 0xffffffff80c1b9d3 at panic+0x43
kernel: #3 0xffffffff80bb07dd at make_dev_sv+0x3fd
kernel: #4 0xffffffff80bb03cb at make_dev_s+0x3b
kernel: #5 0xffffffff80d3e69b at tun_create_device+0xdb
kernel: #6 0xffffffff80d3fecc at tunclone+0x25c
kernel: #7 0xffffffff80ab27d0 at devfs_lookup+0x600
kernel: #8 0xffffffff80ce9bfc at lookup+0x45c
kernel: #9 0xffffffff80ce8e29 at namei+0x259
kernel: #10 0xffffffff80d0e2f3 at vn_open_cred+0x533
kernel: #11 0xffffffff80d04663 at kern_openat+0x283
kernel: #12 0xffffffff810b0d55 at amd64_syscall+0x775
kernel: #13 0xffffffff81087e8b at fast_syscall_common+0xf8
kernel: Uptime: 8m18s
kernel: Dumping 337 out of 4054
MB:..5%..15%..24%..34%..43%..53%..62%..72%..81%..91%
kernel: Dump complete
kernel: Automatic reboot in 15 seconds - press a key on the console to abort
kernel: Rebooting...
kernel: ---<<BOOT>>---
kernel: Copyright (c) 1992-2021 The FreeBSD Project.
kernel: Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993,
1994
kernel:  The Regents of the University of California. All rights reserved.
kernel: FreeBSD is a registered trademark of The FreeBSD Foundation.
kernel: FreeBSD 13.1-RELEASE-p2 GENERIC amd64
kernel: FreeBSD clang version 13.0.0 (git@github.com:llvm/llvm-project.git
llvmorg-13.0.0-0-gd7b669b3a303)
kernel: VT(vga): text 80x25
kernel: CPU: QEMU Virtual CPU version 2.5+ (1995.51-MHz K8-class CPU)

Detailed:
% cat /var/crash/core.txt.3 | grep -A 60 curth
__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) #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  0xffffffff80c1b75c in kern_reboot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:487
#3  0xffffffff80c1bbce in vpanic (
    fmt=0xffffffff811f51ab "make_dev_sv: bad si_name (error=%d, si_name=%s)", 
    ap=<optimized out>) at /usr/src/sys/kern/kern_shutdown.c:920
#4  0xffffffff80c1b9d3 in panic (fmt=<unavailable>)
    at /usr/src/sys/kern/kern_shutdown.c:844
#5  0xffffffff80bb07dd in make_dev_sv (args1=<optimized out>, 
    dres=0xfffffe00a8557880, fmt=<optimized out>, ap=<optimized out>)
    at /usr/src/sys/kern/kern_conf.c:808
#6  0xffffffff80bb03cb in make_dev_s (args=<unavailable>, 
    args@entry=0xfffffe00a8557620, dres=<unavailable>, 
    dres@entry=0xfffffe00a8557880, fmt=<unavailable>)
    at /usr/src/sys/kern/kern_conf.c:853
#7  0xffffffff80d3e69b in tun_create_device (
    drv=drv@entry=0xffffffff819287e0 <tuntap_drivers>, unit=4, 
    cr=cr@entry=0xfffff80128d22e00, dev=dev@entry=0xfffffe00a8557880, 
    name=name@entry=0xfffffe00a85576d0 "tun4")
    at /usr/src/sys/net/if_tuntap.c:819
#8  0xffffffff80d3fecc in tunclone (arg=<optimized out>, arg@entry=0x0, 
    cred=cred@entry=0xfffff80128d22e00, name=0xfffffe00a85576d0 "tun4", 
    name@entry=0xfffffe00a855799c "tun", namelen=4, 
    dev=dev@entry=0xfffffe00a8557880) at /usr/src/sys/net/if_tuntap.c:608
#9  0xffffffff80ab27d0 in devfs_lookupx (ap=<optimized out>, 
    dm_unlock=<optimized out>) at /usr/src/sys/fs/devfs/devfs_vnops.c:1115
#10 devfs_lookup (ap=<unavailable>, 
    ap@entry=<error reading variable: value is not available>)
    at /usr/src/sys/fs/devfs/devfs_vnops.c:1192
#11 0xffffffff80ce9bfc in VOP_LOOKUP (dvp=0xfffff80128c245b8, 
    vpp=0xfffffe00a8557d10, cnp=0xfffffe00a8557d38) at ./vnode_if.h:65
#12 lookup (ndp=ndp@entry=0xfffffe00a8557cb8)
    at /usr/src/sys/kern/vfs_lookup.c:1086
#13 0xffffffff80ce8e29 in namei (ndp=ndp@entry=0xfffffe00a8557cb8)
    at /usr/src/sys/kern/vfs_lookup.c:616
#14 0xffffffff80d0e2f3 in vn_open_cred (ndp=ndp@entry=0xfffffe00a8557cb8, 
    flagp=flagp@entry=0xfffffe00a8557dd4, cmode=cmode@entry=0, 
    vn_open_flags=<optimized out>, vn_open_flags@entry=16, 
    cred=0xfffff80128d22e00, fp=0xfffff80128edf6e0)
    at /usr/src/sys/kern/vfs_vnops.c:327
#15 0xffffffff80d04663 in kern_openat (td=0xfffffe00a8eb1720, fd=-100, 
    path=0x20b9d6 <error: Cannot access memory at address 0x20b9d6>, 
    pathseg=UIO_USERSPACE, flags=3, mode=<optimized out>)
    at /usr/src/sys/kern/vfs_syscalls.c:1159
#16 0xffffffff810b0d55 in syscallenter (td=0xfffffe00a8eb1720)
    at /usr/src/sys/amd64/amd64/../../kern/subr_syscall.c:161
#17 amd64_syscall (td=0xfffffe00a8eb1720, traced=0)
    at /usr/src/sys/amd64/amd64/trap.c:1185
#18 <signal handler called>
#19 0x0000000827f895fa in ?? ()
Backtrace stopped: Cannot access memory at address 0x8203f8e68
(kgdb) 

What I configured (it works for at least two weeks):
I have multiple FIBs with vnet enabled jails + PF. OpenVPN Clients on different
FIBs. loaded netgraph ng_{netflow, ksocket, ether}

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