[Bug 279195] kernel panic while re-configuring if_vlan(4) vlan id

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279195

--- Comment #1 from Zhenlei Huang <zlei@FreeBSD.org> ---
Backtrace:

```
Unread portion of the kernel message buffer:
panic: vlan_remhash: vlan not found

cpuid = 1
time = 1716278185
KDB: stack backtrace:
#0 0xffffffff80b9009d at kdb_backtrace+0x5d
#1 0xffffffff80b431a2 at vpanic+0x132
#2 0xffffffff80b43063 at panic+0x43
#3 0xffffffff80c72553 at vlan_remhash+0x63
#4 0xffffffff80c7414d at vlan_config+0xdd
#5 0xffffffff80c73bea at vlan_ioctl+0x41a
#6 0xffffffff80c60723 at ifhwioctl+0x883
#7 0xffffffff80c62843 at ifioctl+0x913
#8 0xffffffff80bb15a5 at kern_ioctl+0x255
#9 0xffffffff80bb12e3 at sys_ioctl+0x123
#10 0xffffffff8100d119 at amd64_syscall+0x109
#11 0xffffffff80fe43db at fast_syscall_common+0xf8
Uptime: 47s
Dumping 696 out of 16207 MB:..3%..12%..21%..33%..42%..51%..63%..72%..81%..92%

(kgdb) bt
#0  __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:57
#1  doadump (textdump=<optimized out>) at /usr/src/sys/kern/kern_shutdown.c:405
#2  0xffffffff80b42d37 in kern_reboot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:526
#3  0xffffffff80b4320f in vpanic (fmt=0xffffffff81150b30 "%s: vlan not
found\n", ap=ap@entry=0xfffffe00f9bcd9c0) at
/usr/src/sys/kern/kern_shutdown.c:970
#4  0xffffffff80b43063 in panic (fmt=<unavailable>) at
/usr/src/sys/kern/kern_shutdown.c:894
#5  0xffffffff80c72553 in vlan_remhash (trunk=<optimized out>,
ifv=ifv@entry=0xfffff8032f2c9d80) at /usr/src/sys/net/if_vlan.c:480
#6  0xffffffff80c7414d in vlan_config (ifv=ifv@entry=0xfffff8032f2c9d80,
p=p@entry=0xfffff80003ba7800, vid=111, proto=<optimized out>) at
/usr/src/sys/net/if_vlan.c:1719
#7  0xffffffff80c73bea in vlan_ioctl (ifp=0xfffff8036582e000, ifp@entry=<error
reading variable: value is not available>, cmd=<unavailable>, 
    cmd@entry=<error reading variable: value is not available>,
data=<unavailable>, data@entry=<error reading variable: value is not
available>)
    at /usr/src/sys/net/if_vlan.c:2264
#8  0xffffffff80c60723 in ifhwioctl (cmd=cmd@entry=2149607737,
ifp=0xfffff8036582e000, data=data@entry=0xfffffe00f9bcdd50 "vlan0",
td=td@entry=0xfffffe00fae223a0)
    at /usr/src/sys/net/if.c:2757
#9  0xffffffff80c62843 in ifioctl (so=0xfffff8000ae773c0, so@entry=<error
reading variable: value is not available>, cmd=2149607737, 
    cmd@entry=<error reading variable: value is not available>,
data=0xfffffe00f9bcdd50 "vlan0", data@entry=<error reading variable: value is
not available>, 
    td=0xfffffe00fae223a0, td@entry=<error reading variable: value is not
available>) at /usr/src/sys/net/if.c:3070
#10 0xffffffff80bb15a5 in fo_ioctl (fp=0xfffff800039b5640, com=2149607737,
data=<unavailable>, active_cred=<unavailable>, td=0xfffffe00fae223a0) at
/usr/src/sys/sys/file.h:366
#11 kern_ioctl (td=td@entry=0xfffffe00fae223a0, fd=<optimized out>,
com=com@entry=2149607737, data=<unavailable>, data@entry=0xfffffe00f9bcdd50
"vlan0")
    at /usr/src/sys/kern/sys_generic.c:805
#12 0xffffffff80bb12e3 in sys_ioctl (td=0xfffffe00fae223a0,
uap=0xfffffe00fae227a0) at /usr/src/sys/kern/sys_generic.c:713
#13 0xffffffff8100d119 in syscallenter (td=0xfffffe00fae223a0) at
/usr/src/sys/amd64/amd64/../../kern/subr_syscall.c:187
#14 amd64_syscall (td=0xfffffe00fae223a0, traced=0) at
/usr/src/sys/amd64/amd64/trap.c:1197
#15 <signal handler called>
#16 0x0000178be8b75e0a in ?? ()
Backtrace stopped: Cannot access memory at address 0x178be401c0a8
(kgdb) 
```

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