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and then change the status of the bug to 'Confirmed'.

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This change has been made by an automated script, maintained by the
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** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: xenial

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  System freeze after in6_dev_finish_destroy errors

Status in linux package in Ubuntu:

Bug description:
  After the upgrade to the `4.4.0-83-generic #106~14.04.1-Ubuntu` kernel
  we are seeing system hangs with the following logs.  Prior to this
  upgrade there were no crashes or kernel traces of this sort.  We have
  ruled out physical hardware issues by moving the VM to another
  physical host.

  In the logs there's reference to docker instances on the host.  This
  results in veth devices being brought up and torn down frequently,
  which is likely related.

  As a possible workaround we have disabled IPv6 for now.

  kernel: [337352.274907] vethf317e0d: renamed from eth0
  kernel: [337352.386446] docker0: port 1(veth160ed4a) entered disabled state
  kernel: [337352.393444] docker0: port 1(veth160ed4a) entered disabled state
  kernel: [337352.395408] device veth160ed4a left promiscuous mode
  kernel: [337352.395417] docker0: port 1(veth160ed4a) entered disabled state
  kernel: [337359.301576] vethee2599d: renamed from eth0
  kernel: [337359.339582] docker0: port 2(veth3100aab) entered disabled state
  kernel: [337359.343059] docker0: port 2(veth3100aab) entered disabled state
  kernel: [337359.344987] device veth3100aab left promiscuous mode
  kernel: [337359.344997] docker0: port 2(veth3100aab) entered disabled state
  kernel: [337475.398358] ------------[ cut here ]------------
  kernel: [337475.398370] WARNING: CPU: 3 PID: 23671 at 

  kernel: [337475.398372] Modules linked in: btrfs xor raid6_pq ufs qnx4 
hfsplus hfs minix ntfs msdos jfs xfs libcrc32c veth ip6table_filter ip6_tab
  comment ipt_MASQUERADE nf_nat_masquerade_ipv4 xfrm_user xfrm_algo iptable_nat 
nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_fil
  filter bridge stp llc aufs tcp_diag inet_diag coretemp crct10dif_pclmul 
crc32_pclmul ghash_clmulni_intel aesni_intel ppdev aes_x86_64 lrw gf128mul
  input_leds serio_raw drm_kms_helper parport_pc drm lp fb_sys_fops syscopyarea 
sysfillrect sysimgblt vmw_vmci parport shpchp 8250_fintek i2c_piix4

  kernel: [337475.398416] CPU: 3 PID: 23671 Comm: kworker/u8:0 Not tainted 
4.4.0-83-generic #106~14.04.1-Ubuntu
  kernel: [337475.398418] Hardware name: VMware, Inc. VMware Virtual 
Platform/440BX Desktop Reference Platform, BIOS 6.00 09/17/2015
  kernel: [337475.398423] Workqueue: netns cleanup_net
  kernel: [337475.398424]  0000000000000000 ffff8801b197fbb8 ffffffff813ddefc 
  kernel: [337475.398427]  ffffffff81d7aa10 ffff8801b197fbf0 ffffffff8107ea36 
  kernel: [337475.398428]  ffff88016f97e800 0000000000000006 ffff8801b197fcc0 
  kernel: [337475.398430] Call Trace:
  kernel: [337475.398435]  [<ffffffff813ddefc>] dump_stack+0x63/0x87
  kernel: [337475.398440]  [<ffffffff8107ea36>] warn_slowpath_common+0x86/0xc0
  kernel: [337475.398442]  [<ffffffff8107eb2a>] warn_slowpath_null+0x1a/0x20
  kernel: [337475.398444]  [<ffffffff817e886b>] in6_dev_finish_destroy+0x6b/0xb0
  kernel: [337475.398447]  [<ffffffff817be120>] ip6_route_dev_notify+0x110/0x130
  kernel: [337475.398450]  [<ffffffff8109dd89>] notifier_call_chain+0x49/0x70
  kernel: [337475.398452]  [<ffffffff8109dea6>] 
  kernel: [337475.398455]  [<ffffffff81701d25>] 
  kernel: [337475.398458]  [<ffffffff8170c017>] netdev_run_todo+0x157/0x300
  kernel: [337475.398461]  [<ffffffff81703a3e>] ? 
  kernel: [337475.398463]  [<ffffffff817172be>] rtnl_unlock+0xe/0x10
  kernel: [337475.398464]  [<ffffffff81704d88>] 
  kernel: [337475.398468]  [<ffffffff810bf4e0>] ? __wake_up_sync+0x20/0x20
  kernel: [337475.398470]  [<ffffffff816fd242>] ops_exit_list.isra.4+0x52/0x60
  kernel: [337475.398472]  [<ffffffff816fe213>] cleanup_net+0x1b3/0x280
  kernel: [337475.398476]  [<ffffffff81096d30>] process_one_work+0x150/0x3f0
  kernel: [337475.398478]  [<ffffffff810974aa>] worker_thread+0x11a/0x470
  kernel: [337475.398481]  [<ffffffff818089c9>] ? __schedule+0x359/0x980
  kernel: [337475.398483]  [<ffffffff81097390>] ? rescuer_thread+0x310/0x310
  kernel: [337475.398484]  [<ffffffff8109cd66>] kthread+0xd6/0xf0
  kernel: [337475.398486]  [<ffffffff8109cc90>] ? kthread_park+0x60/0x60
  kernel: [337475.398488]  [<ffffffff8180cc0f>] ret_from_fork+0x3f/0x70
  kernel: [337475.398490]  [<ffffffff8109cc90>] ? kthread_park+0x60/0x60
  kernel: [337475.398491] ---[ end trace 6d63274dc9a3dbec ]---
  kernel: [337475.398492] ------------[ cut here ]------------


  ProblemType: Bug
  ApportVersion: 2.14.1-0ubuntu3.24
  Architecture: amd64
  Date: Fri Jul  7 13:59:36 2017
   adduser 3.113+nmu3ubuntu3
   apt-utils 1.0.1ubuntu2.17
   base-passwd 3.5.33
   busybox-initramfs 1:1.21.0-1ubuntu1
   coreutils 8.21-1ubuntu5.4
   cpio 2.11+dfsg-1ubuntu1.2
   dbus 1.6.18-0ubuntu4.5
   debconf 1.5.51ubuntu2
   debconf-i18n 1.5.51ubuntu2
   debianutils 4.4
   dmsetup 2:1.02.77-6ubuntu2
   dpkg 1.17.5ubuntu5.7
   e2fslibs 1.42.9-3ubuntu1.3
   e2fsprogs 1.42.9-3ubuntu1.3
   findutils 4.4.2-7
   gcc-4.8-base 4.8.4-2ubuntu1~14.04.3
   gcc-4.9-base 4.9.3-0ubuntu4
   grub-common 2.02~beta2-9ubuntu1.12
   grub-gfxpayload-lists 0.6
   grub-pc 2.02~beta2-9ubuntu1.12
   grub-pc-bin 2.02~beta2-9ubuntu1.12
   grub2-common 2.02~beta2-9ubuntu1.12
   initramfs-tools 0.103ubuntu4.7
   initramfs-tools-bin 0.103ubuntu4.7
   initscripts 2.88dsf-41ubuntu6.3
   insserv 1.14.0-5ubuntu2
   iproute2 3.12.0-2ubuntu1
   isc-dhcp-client 4.2.4-7ubuntu12.10
   isc-dhcp-common 4.2.4-7ubuntu12.10
   klibc-utils 2.0.3-0ubuntu1.14.04.2
   kmod 15-0ubuntu6
   libacl1 2.2.52-1
   libapparmor1 2.10.95-0ubuntu2.6~14.04.1
   libapt-inst1.5 1.0.1ubuntu2.17
   libapt-pkg4.12 1.0.1ubuntu2.17
   libattr1 1:2.4.47-1ubuntu1
   libaudit-common 1:2.3.2-2ubuntu1
   libaudit1 1:2.3.2-2ubuntu1
   libblkid1 2.20.1-5.1ubuntu20.9
   libbz2-1.0 1.0.6-5
   libc6 2.19-0ubuntu6.13
   libcap2 1:2.24-0ubuntu2
   libcgmanager0 0.24-0ubuntu7.5
   libcomerr2 1.42.9-3ubuntu1.3
   libdb5.3 5.3.28-3ubuntu3
   libdbus-1-3 1.6.18-0ubuntu4.5
   libdebconfclient0 0.187ubuntu1
   libdevmapper1.02.1 2:1.02.77-6ubuntu2
   libdrm2 2.4.67-1ubuntu0.14.04.1
   libexpat1 2.1.0-4ubuntu1.3
   libffi6 3.1~rc1+r3.0.13-12ubuntu0.1
   libfreetype6 2.5.2-1ubuntu2.8
   libfuse2 2.9.2-4ubuntu4.14.04.1
   libgcc1 1:4.9.3-0ubuntu4
   libglib2.0-0 2.40.2-0ubuntu1
   libglib2.0-data 2.40.2-0ubuntu1
   libgpm2 1.20.4-6.1
   libjson-c2 0.11-3ubuntu1.2
   libjson0 0.11-3ubuntu1.2
   libklibc 2.0.3-0ubuntu1.14.04.2
   libkmod2 15-0ubuntu6
   liblocale-gettext-perl 1.05-7build3
   liblzma5 5.1.1alpha+20120614-2ubuntu2
   libmount1 2.20.1-5.1ubuntu20.9
   libncurses5 5.9+20140118-1ubuntu1
   libncursesw5 5.9+20140118-1ubuntu1
   libnih-dbus1 1.0.3-4ubuntu25
   libnih1 1.0.3-4ubuntu25
   libpam-modules 1.1.8-1ubuntu2.2
   libpam-modules-bin 1.1.8-1ubuntu2.2
   libpam-runtime 1.1.8-1ubuntu2.2
   libpam-systemd 204-5ubuntu20.24
   libpam0g 1.1.8-1ubuntu2.2
   libpcre3 1:8.31-2ubuntu2.3
   libplymouth2 0.8.8-0ubuntu17.1
   libpng12-0 1.2.50-1ubuntu2.14.04.2
   libprocps3 1:3.3.9-1ubuntu2.2
   libselinux1 2.2.2-1ubuntu0.1
   libsemanage-common 2.2-1
   libsemanage1 2.2-1
   libsepol1 2.2-1ubuntu0.1
   libslang2 2.2.4-15ubuntu1
   libss2 1.42.9-3ubuntu1.3
   libstdc++6 4.8.4-2ubuntu1~14.04.3
   libsystemd-daemon0 204-5ubuntu20.24
   libsystemd-login0 204-5ubuntu20.24
   libtext-charwidth-perl 0.04-7build3
   libtext-iconv-perl 1.7-5build2
   libtext-wrapi18n-perl 0.06-7
   libtinfo5 5.9+20140118-1ubuntu1
   libudev1 204-5ubuntu20.24
   libustr-1.0-1 1.0.4-3ubuntu2
   libuuid1 2.20.1-5.1ubuntu20.9
   libxml2 2.9.1+dfsg1-3ubuntu4.9
   libxtables10 1.4.21-1ubuntu1
   lsb-base 4.1+Debian11ubuntu6.2
   makedev 2.3.1-93ubuntu2~ubuntu14.04.1
   module-init-tools 15-0ubuntu6
   mount 2.20.1-5.1ubuntu20.9
   mountall 2.53
   multiarch-support 2.19-0ubuntu6.13
   netbase 5.2
   os-prober 1.63ubuntu1.1
   passwd 1:
   perl-base 5.18.2-2ubuntu1.1
   plymouth 0.8.8-0ubuntu17.1
   procps 1:3.3.9-1ubuntu2.2
   psmisc 22.20-1ubuntu2
   sed 4.2.2-4ubuntu1
   sensible-utils 0.0.9
   sgml-base 1.26+nmu4ubuntu1
   shared-mime-info 1.2-0ubuntu3
   systemd-services 204-5ubuntu20.24
   systemd-shim 6-2bzr1
   sysv-rc 2.88dsf-41ubuntu6.3
   sysvinit-utils 2.88dsf-41ubuntu6.3
   tar 1.27.1-1ubuntu0.1
   tzdata 2016j-0ubuntu0.14.04
   ucf 3.0027+nmu1
   udev 204-5ubuntu20.24
   upstart 1.12.1-0ubuntu4.2
   util-linux 2.20.1-5.1ubuntu20.9
   xml-core 0.13+nmu2
   zlib1g 1:1.2.8.dfsg-1ubuntu1
  DistroRelease: Ubuntu 14.04
  InstallationDate: Installed on 2015-08-20 (686 days ago)
  InstallationMedia: Ubuntu-Server 14.04.3 LTS "Trusty Tahr" - Beta amd64 
  Package: linux-image-4.4.0-83-generic 4.4.0-83.106~14.04.1
  PackageArchitecture: amd64
   processor    : 3
   vendor_id    : GenuineIntel
   cpu family   : 6
   model                : 45
   model name   : Intel(R) Xeon(R) CPU E5-2680 0 @ 2.70GHz
   stepping     : 2
   microcode    : 0x710
   cpu MHz              : 2700.000
   cache size   : 20480 KB
   physical id  : 6
   siblings     : 1
   core id              : 0
   cpu cores    : 1
   apicid               : 6
   initial apicid       : 6
   fpu          : yes
   fpu_exception        : yes
   cpuid level  : 13
   wp           : yes
   flags                : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge 
mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx rdtscp lm 
constant_tsc arch_perfmon nopl xtopology tsc_reliable nonstop_tsc aperfmperf 
pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt aes xsave avx 
hypervisor lahf_lm epb dtherm ida arat pln pts
   bugs         :
   bogomips     : 5400.00
   clflush size : 64
   cache_alignment      : 64
   address sizes        : 40 bits physical, 48 bits virtual
   power management:
   PATH=(custom, no user)
  ProcVersionSignature: Ubuntu 4.4.0-83.106~14.04.1-generic 4.4.70
  SourcePackage: linux-lts-xenial
  Tags:  trusty
  Uname: Linux 4.4.0-83-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  _MarkForUpload: True

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