[Bug 231023] ip6_savecontrol_v4 panic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231023

            Bug ID: 231023
           Summary: ip6_savecontrol_v4 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: sbruno at FreeBSD.org

Since updating to -current at svn r338350, we're seeing this panic twice a day.
 I'm having trouble getting the panicstr, but this should point at the location
of the issue.


db> bt
Tracing pid 0 tid 100278 td 0xfffff8001430b000
ip6_savecontrol_v4() at ip6_savecontrol_v4+0x26/frame 0xfffffe00955f75f0
ip6_savecontrol() at ip6_savecontrol+0x2c/frame 0xfffffe00955f7640
icmp6_input() at icmp6_input+0x24a2/frame 0xfffffe00955f7800
ip6_input() at ip6_input+0xc43/frame 0xfffffe00955f78f0
netisr_dispatch_src() at netisr_dispatch_src+0xa8/frame 0xfffffe00955f7940
ether_demux() at ether_demux+0x140/frame 0xfffffe00955f7970
ether_nh_input() at ether_nh_input+0x317/frame 0xfffffe00955f79c0
netisr_dispatch_src() at netisr_dispatch_src+0xa8/frame 0xfffffe00955f7a10
ether_input() at ether_input+0x26/frame 0xfffffe00955f7a30
_task_fn_rx() at _task_fn_rx+0x8e6/frame 0xfffffe00955f7b20
gtaskqueue_run_locked() at gtaskqueue_run_locked+0x144/frame 0xfffffe00955f7b80
gtaskqueue_thread_loop() at gtaskqueue_thread_loop+0x98/frame
0xfffffe00955f7bb0
fork_exit() at fork_exit+0x83/frame 0xfffffe00955f7bf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00955f7bf0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---

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