[Bug 253824] ifconfig test triggers a 'panic: general protection fault' in net/if_vlan.c:1877

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253824

            Bug ID: 253824
           Summary: ifconfig test triggers a 'panic: general protection
                    fault' in net/if_vlan.c:1877
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pho at FreeBSD.org

20210224 21:09:46 all (584/748): ifconfig.sh
if_delmulti_locked: detaching ifnet instance 0xfffff8010c854000


Fatal trap 9: general protection fault while in kernel mode
cpuid = 7; apic id = 07
instruction pointer     = 0x20:0xffffffff80d46644
stack pointer           = 0x28:0xfffffe06c886d760
frame pointer           = 0x28:0xfffffe06c886d7b0
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         = 49513 (ifconfig)
trap number             = 9
panic: general protection fault
cpuid = 7
time = 1614197413
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe06c886d470
vpanic() at vpanic+0x181/frame 0xfffffe06c886d4c0
panic() at panic+0x43/frame 0xfffffe06c886d520
trap_fatal() at trap_fatal+0x387/frame 0xfffffe06c886d580
trap() at trap+0xa4/frame 0xfffffe06c886d690
calltrap() at calltrap+0x8/frame 0xfffffe06c886d690
--- trap 0x9, rip = 0xffffffff80d46644, rsp = 0xfffffe06c886d760, rbp =
0xfffffe06c886d7b0 ---
vlan_ioctl() at vlan_ioctl+0x104/frame 0xfffffe06c886d7b0
ifhwioctl() at ifhwioctl+0x2f6/frame 0xfffffe06c886d8b0
ifioctl() at ifioctl+0x37f/frame 0xfffffe06c886d980
kern_ioctl() at kern_ioctl+0x289/frame 0xfffffe06c886d9f0
sys_ioctl() at sys_ioctl+0x12a/frame 0xfffffe06c886dac0
amd64_syscall() at amd64_syscall+0x147/frame 0xfffffe06c886dbf0

Details @ https://people.freebsd.org/~pho/stress/log/log0055.txt

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