Here is additional debug information: KERNEL: /usr/lib/debug/boot/vmlinux-4.4.0-87-generic DUMPFILE: dump.201709151609 [PARTIAL DUMP] CPUS: 12 DATE: Fri Sep 15 16:05:34 2017 UPTIME: 1 days, 17:34:46 LOAD AVERAGE: 4.17, 5.02, 4.48 TASKS: 2572 NODENAME: 543231-infra02 RELEASE: 4.4.0-87-generic VERSION: #110-Ubuntu SMP Tue Jul 18 12:55:35 UTC 2017 MACHINE: x86_64 (3000 Mhz) MEMORY: 32 GB PANIC: "BUG: unable to handle kernel paging request at 0000000000400000" PID: 4189 COMMAND: "dnsmasq" TASK: ffff8808299dd400 [THREAD_INFO: ffff88042502c000] CPU: 11 STATE: TASK_RUNNING (PANIC) [149668.845048] WARNING: CPU: 0 PID: 11227 at /build/linux-5EyXrQ/linux-4.4.0/net/ipv6/addrconf_core.c:159 in6_dev_finish_destroy+0x6b/0xc0() [149668.845050] Modules linked in: nf_conntrack_netlink ebt_arp ebt_among xt_CT xt_mac xt_physdev xt_set ip_set_hash_net ip_set nfnetlink xt_REDIRECT nf_nat_redirect nf_conntrack_ipv6 nf_defrag_ipv6 xt_nat xt_conntrack xt_mark xt_connmark tcp_diag udp_diag inet_diag unix_diag ebtable_filter xt_comment ip6table_raw ip6table_mangle sunrpc binfmt_misc veth xt_CHECKSUM xt_tcpudp iptable_raw ipmi_ssif kvm_amd ib_iser kvm amd64_edac_mod rdma_cm iw_cm 8250_fintek edac_mce_amd irqbypass ib_cm fam15h_power edac_core ib_sa serio_raw ib_mad i2c_piix4 ipmi_si ipmi_msghandler k10temp hpilo ib_core shpchp ib_addr vhost_net vhost macvtap macvlan nbd mac_hid iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_vs iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 iptable_mangle iptable_filter ipt_REJECT nf_reject_ipv4 [149668.845092] ipt_MASQUERADE nf_nat_masquerade_ipv4 nf_nat nf_conntrack ip_tables ip6table_filter ip6_tables ebtables x_tables dm_snapshot dm_bufio dm_multipath br_netfilter bridge 8021q garp mrp stp llc ixgbe mdio tg3 bonding autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear mlx4_en vxlan ip6_udp_tunnel udp_tunnel crct10dif_pclmul crc32_pclmul ghash_clmulni_intel ttm aesni_intel drm_kms_helper aes_x86_64 lrw gf128mul syscopyarea glue_helper sysfillrect ablk_helper sysimgblt fb_sys_fops cryptd drm psmouse pata_acpi igb pata_atiixp hpsa dca ahci mlx4_core ptp libahci scsi_transport_sas pps_core i2c_algo_bit fjes [149668.845132] CPU: 0 PID: 11227 Comm: kworker/u24:1 Not tainted 4.4.0-87-generic #110-Ubuntu [149668.845134] Hardware name: HP ProLiant SE4255e /, BIOS A31 01/05/2013 [149668.845138] Workqueue: netns cleanup_net [149668.845139] 0000000000000286 e218996f8a60a1fa ffff8802f3637ba0 ffffffff813f9903 [149668.845142] 0000000000000000 ffffffff81d75978 ffff8802f3637bd8 ffffffff81081332 [149668.845144] ffff8806dd999400 ffff8806dd99e800 0000000000000006 ffff8802f3637ca8 [149668.845146] Call Trace: [149668.845151] [] dump_stack+0x63/0x90 [149668.845154] [] warn_slowpath_common+0x82/0xc0 [149668.845156] [] warn_slowpath_null+0x1a/0x20 [149668.845158] [] in6_dev_finish_destroy+0x6b/0xc0 [149668.845161] [] ip6_route_dev_notify+0x116/0x130 [149668.845163] [] notifier_call_chain+0x4a/0x70 [149668.845165] [] raw_notifier_call_chain+0x16/0x20 [149668.845168] [] call_netdevice_notifiers_info+0x35/0x60 [149668.845170] [] netdev_run_todo+0x16d/0x320 [149668.845173] [] rtnl_unlock+0xe/0x10 [149668.845175] [] default_device_exit_batch+0x147/0x170 [149668.845179] [] ? __wake_up_sync+0x20/0x20 [149668.845181] [] ops_exit_list.isra.4+0x52/0x60 [149668.845183] [] cleanup_net+0x1c2/0x2a0 [149668.845185] [] process_one_work+0x165/0x480 [149668.845188] [] worker_thread+0x4b/0x4c0 [149668.845190] [] ? process_one_work+0x480/0x480 [149668.845192] [] kthread+0xe5/0x100 [149668.845194] [] ? kthread_create_on_node+0x1e0/0x1e0 [149668.845197] [] ret_from_fork+0x3f/0x70 [149668.845199] [] ? kthread_create_on_node+0x1e0/0x1e0 [149668.845200] ---[ end trace a70573408f354326 ]---