[Bug 235097] ci runs panic with use-after-free when running sys/netpfil/pf/nat tests

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235097

--- Comment #6 from Kristof Provost <kp at freebsd.org> ---
I'm running into a different panic trying to reproduce this one:

Fatal trap 9: general protection fault while in kernel mode
cpuid = 4; apic id = 04
instruction pointer     = 0x20:0xffffffff80d07e9a
stack pointer           = 0x28:0xfffffe0074beb6a0
frame pointer           = 0x28:0xfffffe0074beb770
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         = 0 (config_0)
trap number             = 9
panic: general protection fault
cpuid = 4
time = 1548285422
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0074beb3b0
vpanic() at vpanic+0x1b4/frame 0xfffffe0074beb410
panic() at panic+0x43/frame 0xfffffe0074beb470
trap_fatal() at trap_fatal+0x369/frame 0xfffffe0074beb4c0
trap() at trap+0x6c/frame 0xfffffe0074beb5d0
calltrap() at calltrap+0x8/frame 0xfffffe0074beb5d0
--- trap 0x9, rip = 0xffffffff80d07e9a, rsp = 0xfffffe0074beb6a0, rbp =
0xfffffe0074beb770 ---
rtsock_msg_mbuf() at rtsock_msg_mbuf+0xda/frame 0xfffffe0074beb770
rt_newmaddrmsg() at rt_newmaddrmsg+0x108/frame 0xfffffe0074beb820
if_delmulti_locked() at if_delmulti_locked+0x74/frame 0xfffffe0074beb860
if_delmulti_ifma_flags() at if_delmulti_ifma_flags+0x5f/frame
0xfffffe0074beb890
in6m_release_task() at in6m_release_task+0x30e/frame 0xfffffe0074beb8f0
gtaskqueue_run_locked() at gtaskqueue_run_locked+0xf9/frame 0xfffffe0074beb940
gtaskqueue_thread_loop() at gtaskqueue_thread_loop+0x88/frame
0xfffffe0074beb970
fork_exit() at fork_exit+0x84/frame 0xfffffe0074beb9b0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0074beb9b0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic

I thought that might have been fixed by mark's r 343363 fix for 234296, but
that doesn't appear to be the case.

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