This looks a lot like what I'm seeing on #1709511

I'm running qemu+kvm virtual machines.

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https://bugs.launchpad.net/bugs/1709564

Title:
  Kernel bug after upgrade to 4.4.0-89

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I use lxc containers on Ubuntu 16.04. On each container started systemd, 
sytemd-journald, apache and nginx services. After upgrade kernel to 4.4.0-89 
(from 4.4.0-81) the kernel crashes with stack trace:
  [53345.605103] BUG: unable to handle kernel NULL pointer dereference at       
    (null)
  [53345.699074] IP: [<ffffffff814002e9>] rb_erase+0x119/0x350
  [53345.763816] PGD 0
  [53345.787977] Oops: 0002 [#1] SMP
  [53345.826815] Modules linked in: ebt_arpreply ebt_arp ebtable_nat ebtables 
veth ip6table_filter ip6_tables ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_nat 
xt_tcpudp iptable_nat nf_nat_ipv4 nf_nat nf_log_ipv4 nf_log_common xt_LOG 
ipt_REJECT nf_reject_ipv4 nf_conntrack_ipv4 nf_defrag_ipv4 xt_multiport 
xt_conntrack iptable_filter ip_tables x_tables bridge ipmi_ssif ipmi_devintf 
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass 
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw 
gf128mul glue_helper ablk_helper cryptd 8021q garp sb_edac mrp stp llc 
cdc_ether edac_core usbnet mii input_leds lpc_ich ioatdma ipmi_si 
ipmi_msghandler 8250_fintek shpchp mac_hid binfmt_misc nf_conntrack_ftp 
nf_conntrack autofs4 xfs btrfs raid10 raid456 async_raid6_recov async_memcpy 
async_pq async_xor async_tx xor raid6_pq libcrc32c raid0 multipath linear 
hid_generic igb usbhid ses dca enclosure ptp raid1 pps_core ahci wmi 
i2c_algo_bit hid libahci megaraid_sas fjes
  [53346.875501] CPU: 8 PID: 63241 Comm: lxc-user-nic Not tainted 
4.4.0-89-generic #112-Ubuntu
  [53346.973399] Hardware name: IBM System x3650 M4 : -[7915V4U]-/00Y8473, BIOS 
-[VVE154DUS-2.40]- 04/07/2017
  [53347.086927] task: ffff881941f10e00 ti: ffff88193cb14000 task.ti: 
ffff88193cb14000
  [53347.176548] RIP: 0010:[<ffffffff814002e9>]  [<ffffffff814002e9>] 
rb_erase+0x119/0x350
  [53347.270461] RSP: 0018:ffff88193cb17628  EFLAGS: 00010282
  [53347.334059] RAX: ffff88195afadb28 RBX: ffff88193e9e4048 RCX: 
ffff88195afadb29
  [53347.419502] RDX: ffff88193bc44b28 RSI: ffff88195f079148 RDI: 
0000000000000000
  [53347.504939] RBP: ffff88193cb17628 R08: 0000000000000000 R09: 
0000000000000000
  [53347.590377] R10: ffff88195afadb08 R11: ffff88193e9e6000 R12: 
ffff88195afad800
  [53347.675816] R13: 0000000000000000 R14: ffff88193cb177e8 R15: 
0000000000000000
  [53347.761261] FS:  00007f45a21cb840(0000) GS:ffff88203f280000(0000) 
knlGS:0000000000000000
  [53347.858167] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [53347.926964] CR2: 0000000000000000 CR3: 000000098c83f000 CR4: 
00000000001406e0
  [53348.012405] Stack:
  [53348.036476]  ffff88193cb17648 ffffffff81287d26 ffff88195afad800 
ffff88195f079100
  [53348.125524]  ffff88193cb176a0 ffffffff8128849c 0000000000000000 
0000000000000000
  [53348.214565]  0000000000000000 ffff88193cb176e8 ba207a01caae4123 
ffff88193e9e4000
  [53348.303601] Call Trace:
  [53348.332876]  [<ffffffff81287d26>] erase_header+0x46/0x60
  [53348.396483]  [<ffffffff8128849c>] drop_sysctl_table+0x6c/0xe0
  [53348.465285]  [<ffffffff8128854e>] unregister_sysctl_table+0x3e/0x90
  [53348.540333]  [<ffffffff81833c5e>] unregister_net_sysctl_table+0xe/0x10
  [53348.618494]  [<ffffffff817ac591>] 
__devinet_sysctl_unregister.isra.20+0x21/0x30
  [53348.706043]  [<ffffffff817ae651>] inetdev_event+0x341/0x4f0
  [53348.772766]  [<ffffffff81720999>] ? skb_dequeue+0x59/0x70
  [53348.837402]  [<ffffffff810a1bba>] notifier_call_chain+0x4a/0x70
  [53348.908284]  [<ffffffff810a1d36>] raw_notifier_call_chain+0x16/0x20
  [53348.983328]  [<ffffffff81730675>] call_netdevice_notifiers_info+0x35/0x60
  [53349.064612]  [<ffffffff817395c6>] dev_change_name+0x216/0x2e0
  [53349.133419]  [<ffffffff81748886>] do_setlink+0x5a6/0xb80
  [53349.197021]  [<ffffffff810b8887>] ? enqueue_entity+0x3a7/0xd10
  [53349.266863]  [<ffffffff810b3afa>] ? select_idle_sibling+0x2a/0x120
  [53349.340866]  [<ffffffff810b5359>] ? update_curr+0x79/0x160
  [53349.406548]  [<ffffffff81426450>] ? nla_parse+0xa0/0x100
  [53349.470144]  [<ffffffff8174954a>] rtnl_newlink+0x5aa/0x8a0
  [53349.535829]  [<ffffffff8108a918>] ? ns_capable_common+0x68/0x80
  [53349.606715]  [<ffffffff8108a943>] ? ns_capable+0x13/0x20
  [53349.670316]  [<ffffffff81747bc6>] rtnetlink_rcv_msg+0xe6/0x230
  [53349.740158]  [<ffffffff817226d7>] ? __alloc_skb+0x87/0x1f0
  [53349.805840]  [<ffffffff81747ae0>] ? rtnetlink_rcv+0x30/0x30
  [53349.872562]  [<ffffffff8176a824>] netlink_rcv_skb+0xa4/0xc0
  [53349.939284]  [<ffffffff81747ad8>] rtnetlink_rcv+0x28/0x30
  [53350.003927]  [<ffffffff8176a1fa>] netlink_unicast+0x18a/0x240
  [53350.072728]  [<ffffffff8176a5ab>] netlink_sendmsg+0x2fb/0x3a0
  [53350.141532]  [<ffffffff813a0401>] ? aa_sock_msg_perm+0x61/0x150
  [53350.212409]  [<ffffffff81719ad8>] sock_sendmsg+0x38/0x50
  [53350.276013]  [<ffffffff8171a581>] ___sys_sendmsg+0x281/0x290
  [53350.343780]  [<ffffffff8139fb40>] ? aa_sk_perm+0x70/0x210
  [53350.408422]  [<ffffffff8139fe5b>] ? aa_sock_perm+0x4b/0xe0
  [53350.474103]  [<ffffffff817186b4>] ? move_addr_to_user+0xb4/0xd0
  [53350.544983]  [<ffffffff8171aed1>] __sys_sendmsg+0x51/0x90
  [53350.609626]  [<ffffffff8171af22>] SyS_sendmsg+0x12/0x20
  [53350.672189]  [<ffffffff81841f32>] entry_SYSCALL_64_fastpath+0x16/0x71
  [53350.749304] Code: c3 48 8b 3a 48 89 0a 83 e7 01 74 a1 31 c9 e9 82 00 00 00 
f6 02 01 75 3a 48 8b 7a 10 48 89 c1 48 83 c9 01 48 89 78 08 48 89 42 10 <48> 89 
0f 48 8b 08 48 89 0a 48 83 e1 fc 48 89 10 0f 84 00 01 00
  [53350.982731] RIP  [<ffffffff814002e9>] rb_erase+0x119/0x350
  [53351.048522]  RSP <ffff88193cb17628>
  [53351.090273] CR2: 0000000000000000
  [53351.132166] ---[ end trace 7981db36e8cfd55f ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-89-generic 4.4.0-89.112
  ProcVersionSignature: Ubuntu 4.4.0-89.112-generic 4.4.76
  Uname: Linux 4.4.0-89-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Aug  9 10:44 seq
   crw-rw---- 1 root audio 116, 33 Aug  9 10:44 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  Date: Wed Aug  9 10:53:20 2017
  HibernationDevice: RESUME=/dev/mapper/vg_system-swap
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  MachineType: IBM System x3650 M4 : -[7915V4U]-
  PciMultimedia:

  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-89-generic 
root=/dev/mapper/vg_system-lv_root ro noquiet nosplash net.ifnames=0 
biosdevname=0 console=tty0 console=ttyS0,9600n8 crashkernel=384M-:128M
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-89-generic N/A
   linux-backports-modules-4.4.0-89-generic  N/A
   linux-firmware                            1.157.11
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/07/2017
  dmi.bios.vendor: IBM
  dmi.bios.version: -[VVE154DUS-2.40]-
  dmi.board.name: 00Y8473
  dmi.board.vendor: IBM
  dmi.chassis.asset.tag: none
  dmi.chassis.type: 23
  dmi.chassis.vendor: IBM
  dmi.chassis.version: none
  dmi.modalias: 
dmi:bvnIBM:bvr-[VVE154DUS-2.40]-:bd04/07/2017:svnIBM:pnSystemx3650M4-[7915V4U]-:pvr0C:rvnIBM:rn00Y8473:rvr:cvnIBM:ct23:cvrnone:
  dmi.product.name: System x3650 M4 : -[7915V4U]-
  dmi.product.version: 0C
  dmi.sys.vendor: IBM

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