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     r...@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%

Reading symbols from /boot/kernel/linux.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/linux.ko.debug...done.
done.
Loaded symbols for /boot/kernel/linux.ko
Reading symbols from /boot/kernel/linux_common.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/linux_common.ko.debug...done.
done.
Loaded symbols for /boot/kernel/linux_common.ko
Reading symbols from /boot/kernel/if_lagg.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/if_lagg.ko.debug...done.
done.
Loaded symbols for /boot/kernel/if_lagg.ko
Reading symbols from /boot/kernel/snd_envy24ht.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/snd_envy24ht.ko.debug...done.
done.
Loaded symbols for /boot/kernel/snd_envy24ht.ko
Reading symbols from /boot/kernel/snd_spicds.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/snd_spicds.ko.debug...done.
done.
Loaded symbols for /boot/kernel/snd_spicds.ko
Reading symbols from /boot/kernel/coretemp.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/coretemp.ko.debug...done.
done.
Loaded symbols for /boot/kernel/coretemp.ko
Reading symbols from /boot/kernel/fuse.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/fuse.ko.debug...done.
done.
Loaded symbols for /boot/kernel/fuse.ko
Reading symbols from /boot/kernel/ichsmb.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/ichsmb.ko.debug...done.
done.
Loaded symbols for /boot/kernel/ichsmb.ko
Reading symbols from /boot/kernel/smbus.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/smbus.ko.debug...done.
done.
Loaded symbols for /boot/kernel/smbus.ko
Reading symbols from /boot/kernel/ichwd.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/ichwd.ko.debug...done.
done.
Loaded symbols for /boot/kernel/ichwd.ko
Reading symbols from /boot/kernel/cpuctl.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/cpuctl.ko.debug...done.
done.
Loaded symbols for /boot/kernel/cpuctl.ko
Reading symbols from /boot/kernel/cryptodev.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/cryptodev.ko.debug...done.
done.
Loaded symbols for /boot/kernel/cryptodev.ko
Reading symbols from /boot/kernel/dtraceall.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/dtraceall.ko.debug...done.
done.
Loaded symbols for /boot/kernel/dtraceall.ko
Reading symbols from /boot/kernel/profile.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/profile.ko.debug...done.
done.
Loaded symbols for /boot/kernel/profile.ko
Reading symbols from /boot/kernel/dtrace.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/dtrace.ko.debug...done.
done.
Loaded symbols for /boot/kernel/dtrace.ko
Reading symbols from /boot/kernel/systrace_freebsd32.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/systrace_freebsd32.ko.debug...done.
done.
Loaded symbols for /boot/kernel/systrace_freebsd32.ko
Reading symbols from /boot/kernel/systrace.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/systrace.ko.debug...done.
done.
Loaded symbols for /boot/kernel/systrace.ko
Reading symbols from /boot/kernel/sdt.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/sdt.ko.debug...done.
done.
Loaded symbols for /boot/kernel/sdt.ko
Reading symbols from /boot/kernel/fasttrap.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/fasttrap.ko.debug...done.
done.
Loaded symbols for /boot/kernel/fasttrap.ko
Reading symbols from /boot/kernel/fbt.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/fbt.ko.debug...done.
done.
Loaded symbols for /boot/kernel/fbt.ko
Reading symbols from /boot/kernel/dtnfscl.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/dtnfscl.ko.debug...done.
done.
Loaded symbols for /boot/kernel/dtnfscl.ko
Reading symbols from /boot/kernel/dtmalloc.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/dtmalloc.ko.debug...done.
done.
Loaded symbols for /boot/kernel/dtmalloc.ko
Reading symbols from /boot/kernel/ipmi.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/ipmi.ko.debug...done.
done.
Loaded symbols for /boot/kernel/ipmi.ko
Reading symbols from /boot/kernel/ipmi_linux.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/ipmi_linux.ko.debug...done.
done.
Loaded symbols for /boot/kernel/ipmi_linux.ko
Reading symbols from /boot/kernel/hwpmc.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/hwpmc.ko.debug...done.
done.
Loaded symbols for /boot/kernel/hwpmc.ko
Reading symbols from /boot/kernel/uhid.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/uhid.ko.debug...done.
done.
Loaded symbols for /boot/kernel/uhid.ko
Reading symbols from /boot/kernel/uplcom.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/uplcom.ko.debug...done.
done.
Loaded symbols for /boot/kernel/uplcom.ko
Reading symbols from /boot/kernel/ucom.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/ucom.ko.debug...done.
done.
Loaded symbols for /boot/kernel/ucom.ko
Reading symbols from /boot/kernel/nullfs.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/nullfs.ko.debug...done.
done.
Loaded symbols for /boot/kernel/nullfs.ko
Reading symbols from /boot/kernel/fdescfs.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/fdescfs.ko.debug...done.
done.
Loaded symbols for /boot/kernel/fdescfs.ko
Reading symbols from /boot/kernel/linux64.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/linux64.ko.debug...done.
done.
Loaded symbols for /boot/kernel/linux64.ko
Reading symbols from /boot/kernel/pf.ko...Reading symbols from 
/usr/lib/debug//boot/kernel/pf.ko.debug...done.
done.
Loaded symbols for /boot/kernel/pf.ko
#0  doadump (textdump=1) at pcpu.h:221
221     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) #0  doadump (textdump=1) at pcpu.h:221
#1  0xffffffff80b3b7a5 in kern_reboot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:364
#2  0xffffffff80b3bd7b in vpanic (fmt=<value optimized out>, 
    ap=<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:757
#3  0xffffffff80b3bdc3 in panic (fmt=0x0)
    at /usr/src/sys/kern/kern_shutdown.c:688
#4  0xffffffff80d3252a in nd6_ra_input (m=<value optimized out>, 
    off=<value optimized out>, icmp6len=<value optimized out>)
    at /usr/src/sys/netinet6/nd6_rtr.c:804
#5  0xffffffff80d0b42e in icmp6_input (mp=<value optimized out>, 
    offp=0xfffffe2e0251284c, proto=<value optimized out>)
    at /usr/src/sys/netinet6/icmp6.c:796
#6  0xffffffff80d20eac in ip6_input (m=Cannot access memory at address 0x0
)
    at /usr/src/sys/netinet6/ip6_input.c:917
#7  0xffffffff80c207e1 in netisr_dispatch_src (proto=<value optimized out>, 
    source=<value optimized out>, m=0xfffff8007f05ed00)
    at /usr/src/sys/net/netisr.c:972
#8  0xffffffff80c1693e in ether_demux (ifp=<value optimized out>, 
    m=<value optimized out>) at /usr/src/sys/net/if_ethersubr.c:803
#9  0xffffffff80c17684 in ether_nh_input (m=<value optimized out>)
    at /usr/src/sys/net/if_ethersubr.c:609
#10 0xffffffff80c207e1 in netisr_dispatch_src (proto=<value optimized out>, 
    source=<value optimized out>, m=0xfffff8007f05ed00)
    at /usr/src/sys/net/netisr.c:972
#11 0xffffffff80c16c3f in ether_input (ifp=0xfffff8002ad93800, m=0x0)
    at /usr/src/sys/net/if_ethersubr.c:713
#12 0xffffffff80c13a9a in if_input (ifp=0x0, sendmp=0x0)
    at /usr/src/sys/net/if.c:3814
#13 0xffffffff80628715 in em_rxeof (count=95)
    at /usr/src/sys/dev/e1000/if_em.c:4713
#14 0xffffffff80629c60 in em_handle_que (context=0xfffffe1eaa5a8000, 
    pending=<value optimized out>) at /usr/src/sys/dev/e1000/if_em.c:1572
#15 0xffffffff80b895b0 in taskqueue_run_locked (queue=0xfffff8001a81e500)
    at /usr/src/sys/kern/subr_taskqueue.c:430
#16 0xffffffff80b8a088 in taskqueue_thread_loop (arg=<value optimized out>)
    at /usr/src/sys/kern/subr_taskqueue.c:683
#17 0xffffffff80b00114 in fork_exit (
    callout=0xffffffff80b8a000 <taskqueue_thread_loop>, 
    arg=0xfffffe1eaa5aa730, frame=0xfffffe2e02512c00)
    at /usr/src/sys/kern/kern_fork.c:1010
#18 0xffffffff80f6042e in fork_trampoline ()
    at /usr/src/sys/amd64/amd64/exception.S:609
#19 0x0000000000000000 in ?? ()
Current language:  auto; currently minimal

Core IS available. 

Ideas?

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


-- 
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 214-642-9640                 E-Mail: l...@lerctr.org
US Mail: 7011 W Parmer Ln, Apt 1115, Austin, TX 78729-6961
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