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 /build/linux-lts-xenial-ep3zLI/linux-lts-xenial-4.4.0/net/ipv6/addrconf_core.c:159 in6_dev_f
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 0000000000000000
kernel: [337475.398427] ffffffff81d7aa10 ffff8801b197fbf0 ffffffff8107ea36 ffff88016f97d400
kernel: [337475.398428] ffff88016f97e800 0000000000000006 ffff8801b197fcc0 0000000000000000
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>] raw_notifier_call_chain+0x16/0x20
kernel: [337475.398455] [<ffffffff81701d25>] call_netdevice_notifiers_info+0x35/0x60
kernel: [337475.398458] [<ffffffff8170c017>] netdev_run_todo+0x157/0x300
kernel: [337475.398461] [<ffffffff81703a3e>] ? rollback_registered_many+0x22e/0x2e0
kernel: [337475.398463] [<ffffffff817172be>] rtnl_unlock+0xe/0x10
kernel: [337475.398464] [<ffffffff81704d88>] default_device_exit_batch+0x138/0x150
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
Dependencies:
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
gettext-base 0.18.3.1-1ubuntu3
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
ifupdown 0.7.47.2ubuntu4.4
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
libasprintf0c2 0.18.3.1-1ubuntu3
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 1:4.1.5.1-1ubuntu9.5
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 (20150805)
Package: linux-image-4.4.0-83-generic 4.4.0-83.106~14.04.1
PackageArchitecture: amd64
ProcCpuinfoMinimal:
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:
ProcEnviron:
LANGUAGE=en_GB:
LC_CTYPE=C
TERM=screen
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/zsh
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
This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1702910
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.