[Bug 206904] tailq crash/nd inet6

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206904

            Bug ID: 206904
           Summary: tailq crash/nd inet6
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ler at lerctr.org

Created attachment 166529
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=166529&action=edit
full core.txt

Got the following panic:

borg.lerctr.org dumped core - see /var/crash/vmcore.20

Tue Feb  2 20:59:14 CST 2016

FreeBSD borg.lerctr.org 11.0-CURRENT FreeBSD 11.0-CURRENT #4 r294926: Wed Jan
27 12:37:06 CST 2016     root at borg.lerctr.org:/usr/obj/usr/src/sys/VT-LER 
amd64

panic: Bad tailq NEXT(0xffffffff81e8b5f8->tqh_last) != NULL

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Unread portion of the kernel message buffer:
panic: Bad tailq NEXT(0xffffffff81e8b5f8->tqh_last) != NULL
cpuid = 4
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe2e025122c0
vpanic() at vpanic+0x182/frame 0xfffffe2e02512340
panic() at panic+0x43/frame 0xfffffe2e025123a0
nd6_ra_input() at nd6_ra_input+0x13da/frame 0xfffffe2e02512680
icmp6_input() at icmp6_input+0x97e/frame 0xfffffe2e02512820
ip6_input() at ip6_input+0xc3c/frame 0xfffffe2e02512900
netisr_dispatch_src() at netisr_dispatch_src+0x81/frame 0xfffffe2e02512960
ether_demux() at ether_demux+0x15e/frame 0xfffffe2e02512990
ether_nh_input() at ether_nh_input+0x344/frame 0xfffffe2e025129d0
netisr_dispatch_src() at netisr_dispatch_src+0x81/frame 0xfffffe2e02512a30
ether_input() at ether_input+0x4f/frame 0xfffffe2e02512a60
if_input() at if_input+0xa/frame 0xfffffe2e02512a70
em_rxeof() at em_rxeof+0x2f5/frame 0xfffffe2e02512ae0
em_handle_que() at em_handle_que+0x40/frame 0xfffffe2e02512b20
taskqueue_run_locked() at taskqueue_run_locked+0xf0/frame 0xfffffe2e02512b80
taskqueue_thread_loop() at taskqueue_thread_loop+0x88/frame 0xfffffe2e02512bb0
fork_exit() at fork_exit+0x84/frame 0xfffffe2e02512bf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe2e02512bf0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
Uptime: 8h40m34s
Dumping 3340 out of 64467 MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%

core *IS* available.

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