[Bug 236864] sys/netpfil/pf/ioctl/validation:addtables triggered a GPF panic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236864

            Bug ID: 236864
           Summary: sys/netpfil/pf/ioctl/validation:addtables triggered a
                    GPF panic
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: ngie at FreeBSD.org

>From https://ci.freebsd.org/job/FreeBSD-head-amd64-test/10671/console :

sys/netpfil/pf/ioctl/validation:addtables  ->  
16:58:03 
16:58:03 Fatal trap 9: general protection fault while in kernel mode
16:58:03 cpuid = 0; apic id = 00
16:58:03 instruction pointer    = 0x20:0xffffffff80cc8c75
16:58:03 stack pointer          = 0x28:0xfffffe0030faf740
16:58:03 frame pointer          = 0x28:0xfffffe0030faf740
16:58:03 code segment           = base 0x0, limit 0xfffff, type 0x1b
16:58:03                        = DPL 0, pres 1, long 1, def32 0, gran 1
16:58:03 processor eflags       = interrupt enabled, resume, IOPL = 0
16:58:03 current process                = 23278 (ifconfig)
16:58:03 trap number            = 9
16:58:03 panic: general protection fault
16:58:03 cpuid = 0
16:58:03 time = 1553817482
16:58:03 KDB: stack backtrace:
16:58:03 db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
0xfffffe0030faf450
16:58:03 vpanic() at vpanic+0x19d/frame 0xfffffe0030faf4a0
16:58:03 panic() at panic+0x43/frame 0xfffffe0030faf500
16:58:03 trap_fatal() at trap_fatal+0x394/frame 0xfffffe0030faf560
16:58:03 trap() at trap+0x6c/frame 0xfffffe0030faf670
16:58:03 calltrap() at calltrap+0x8/frame 0xfffffe0030faf670
16:58:03 --- trap 0x9, rip = 0xffffffff80cc8c75, rsp = 0xfffffe0030faf740, rbp
= 0xfffffe0030faf740 ---
16:58:03 strncmp() at strncmp+0x15/frame 0xfffffe0030faf740
16:58:03 ifunit_ref() at ifunit_ref+0x51/frame 0xfffffe0030faf780
16:58:03 ifioctl() at ifioctl+0x508/frame 0xfffffe0030faf850
16:58:03 kern_ioctl() at kern_ioctl+0x28a/frame 0xfffffe0030faf8c0
16:58:03 sys_ioctl() at sys_ioctl+0x15d/frame 0xfffffe0030faf990
16:58:03 amd64_syscall() at amd64_syscall+0x276/frame 0xfffffe0030fafab0
16:58:03 fast_syscall_common() at fast_syscall_common+0x101/frame
0xfffffe0030fafab0
16:58:03 --- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x8004842ca, rsp =
0x7fffffffe448, rbp = 0x7fffffffe4b0 ---

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