Crash on tcp_input()

[Oleksandr Kozachuk <ddeus.pkgsrc%mailnull.com@localhost>]

I get now often following backtrace, the earlier versions had no 
problems with that, may be any one has idea how to solve it?

Here is the full console output with backtrace and everything:
Loaded initial symtab at 0xffffffff8076b868, strtab at 
0xffffffff807ccd98, # entries 15684
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 
2005,
    2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 7.99.51 (PRIV2) #0: Tue Dec 20 23:39:13 CET 2016
        root@xenon:/src/obj/amd64/sys/arch/amd64/compile/PRIV2
total memory = 2048 MB
avail memory = 1974 MB
cpu_rng: RDRAND
running cgd selftest aes-xts-256 aes-xts-512 done
mainbus0 (root)
hypervisor0 at mainbus0: Xen version 4.4.1
vcpu0 at hypervisor0
vcpu0: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz, id 0x306a9
vcpu1 at hypervisor0
vcpu1: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz, id 0x306a9
vcpu2 at hypervisor0
vcpu2: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz, id 0x306a9
vcpu3 at hypervisor0
vcpu3: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz, id 0x306a9
vcpu4 at hypervisor0
vcpu4: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz, id 0x306a9
vcpu5 at hypervisor0
vcpu5: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz, id 0x306a9
vcpu6 at hypervisor0
vcpu6: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz, id 0x306a9
vcpu7 at hypervisor0
vcpu7: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz, id 0x306a9
xenbus0 at hypervisor0: Xen Virtual Bus Interface
xencons0 at hypervisor0: Xen Virtual Console Driver
xenbus: can't get state for device/suspend/event-channel (2)
xbd0 at xenbus0 id 768: Xen Virtual Block Device Interface
xennet0 at xenbus0 id 0: Xen Virtual Network Interface
xennet0: MAC address 00:50:56:02:31:6d
balloon0 at xenbus0 id 0: Xen Balloon driver
balloon0: current reservation: 2097152 KiB
xennet0: using RX copy mode
xenbus: can't get state for device/suspend/event-channel (2)
balloon0: current reservation: 524288 pages => target: 524289 pages
balloon0: memory 'hot-plug' unsupported - clipping reservation 1 => 0 
pages.
balloon0: WARNING: balloon could not reach target 524289 (current 
524288)
ignore shutdown request:
xenbus: can't get state for device/suspend/event-channel (2)
xenbus: can't get state for device/suspend/event-channel (2)
boot device: xbd0
root on xbd0a dumps on xbd0b
dump_misc_init: max_paddr = 0x0
Your machine does not initialize mem_clusters; sparse_dumps disabled
mountroot: trying lfs...
mountroot: trying ext2fs...
mountroot: trying ffs...
/: replaying log to memory
root file system type: ffs
kern.module.path=/stand/amd64/7.99.51/modules
init: copying out path `/sbin/init' 11
Wed Dec 21 15:40:21 CET 2016
Starting root file system check:
/dev/rxbd0a: file system is journaled; not checking
/: replaying log to disk
swapctl: setting dump device to /dev/xbd0b
swapctl: adding /dev/xbd0b as swap device at priority 0
Starting file system checks:
random_seed: /var/db/entropy-file: Not present
Setting tty flags.
Setting sysctl variables:
ddb.onpanic: 1 -> 0
kern.maxfiles: 1772 -> 1000000
kern.sbmax: 262144 -> 4194304
net.inet.ip.forwarding: 1 -> 1
net.inet6.ip6.forwarding: 0 -> 1
Starting network.
Hostname: priv.local
IPv6 mode: host
Configuring network interfaces: xennet0.
Adding interface aliases:.
add net default: gateway 10.10.1.4
add net default: gateway aaaa:aaa:aaa:41a6:10:1:0:4
Waiting for DAD to complete for statically configured addresses...
Building databases: dev, utmp, utmpx.
wsconscfg: Cannot open `/dev/ttyEcfg': Device not configured
wsconscfg: Cannot open `/dev/ttyEcfg': Device not configured
wsconscfg: Cannot open `/dev/ttyEcfg': Device not configured
wsconscfg: Cannot open `/dev/ttyEcfg': Device not configured
Starting syslogd.
Mounting all file systems...
Clearing temporary files.
Updating fontconfig cache: done.
Checking quotas: done.
Setting securelevel: kern.securelevel: 0 -> 1
swapctl: setting dump device to /dev/xbd0b
Starting virecover.
Starting pflogd.
Checking for core dump...
savecore: no core dump
Starting local daemons: daemontools ftp-proxy.
Updating motd.
Starting powerd.
Starting sshd.
Starting inetd.
Starting cron.
Wed Dec 21 15:40:31 CET 2016
Dec 21 15:40:33 priv getty[719]: /dev/ttyE3: Device not configured
Dec 21 15:40:33 priv getty[526]: /dev/ttyE2: Device not configured

NetBSD/amd64 (priv.kozachuk.info) (console)

login: Dec 21 15:40:33 priv getty[1101]: /dev/ttyE1: Device not 
configured
panic: kq_check: kq=0xffffa00004746a18 kn=0xffffa000063fdd68 inconsist 1
cpu0: Begin traceback...
vpanic() at netbsd:vpanic+0x140
snprintf() at netbsd:snprintf
kq_check() at netbsd:kq_check+0x121
knote_activate() at netbsd:knote_activate+0x42
knote() at netbsd:knote+0x4c
selnotify() at netbsd:selnotify+0x25
sowakeup() at netbsd:sowakeup+0x58
tcp_input() at netbsd:tcp_input+0x2f12
tcp6_input() at netbsd:tcp6_input+0x49
ip6_input() at netbsd:ip6_input+0x731
ip6intr() at netbsd:ip6intr+0x7d
softint_overlay() at netbsd:softint_overlay+0x502
lwp_userret() at netbsd:lwp_userret+0x21e
syscall() at netbsd:syscall+0x1a1
--- syscall (number 35) ---
70907343dbda:
cpu0: End traceback...

dumping to dev 142,1 (offset=4194303, siuzvem=_f0a)u:lt (n0oxtf 
fpfofsas0i0b0l0e4
e9d470, 0rxeb0o,o ti2n)g .-.>.

fatal page fault in supervisor mode
trap type 6 code 2 rip ffffffff80395a64 cs e030 rflags 10286 cr2 c4 
ilevel 8 rsp ffffa0005c1f3dd0
curlwp 0xffffa000061b3260 pid 237.2 lowest kstack 0xffffa0005c1f02c0