[Bug 238870] sys.netpfil.pf.names.names and sys.netpfil.pf.synproxy.synproxy cause panic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238870

--- Comment #17 from Bjoern A. Zeeb <bz at FreeBSD.org> ---
I wonder if the recent epcoh changes on head have shifted the problem;  if I
run the names test in an endless loop it pretty quickly panics in

Fatal trap 9: general protection fault while in kernel mode
cpuid = 3; apic id = 05
instruction pointer     = 0x20:0xffffffff80cc4585
stack pointer           = 0x28:0xfffffe00d9785740
frame pointer           = 0x28:0xfffffe00d9785740
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         = 9949 (ifconfig)
trap number             = 9
panic: general protection fault
cpuid = 3
time = 1572126334
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00d9785450
vpanic() at vpanic+0x19d/frame 0xfffffe00d97854a0
panic() at panic+0x43/frame 0xfffffe00d9785500
trap_fatal() at trap_fatal+0x39c/frame 0xfffffe00d9785560
trap() at trap+0x6a/frame 0xfffffe00d9785670
calltrap() at calltrap+0x8/frame 0xfffffe00d9785670
--- trap 0x9, rip = 0xffffffff80cc4585, rsp = 0xfffffe00d9785740, rbp =
0xfffffe00d9785740 ---
strncmp() at strncmp+0x15/frame 0xfffffe00d9785740
ifunit_ref() at ifunit_ref+0x51/frame 0xfffffe00d9785780
ifioctl() at ifioctl+0x396/frame 0xfffffe00d9785850
kern_ioctl() at kern_ioctl+0x295/frame 0xfffffe00d97858b0
sys_ioctl() at sys_ioctl+0x15d/frame 0xfffffe00d9785980
amd64_syscall() at amd64_syscall+0x2b9/frame 0xfffffe00d9785ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00d9785ab0
--- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x8004802ea, rsp =
0x7fffffffe178, rbp = 0x7fffffffe1e0 ---
KDB: enter: panic
[ thread pid 9949 tid 100138 ]

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