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] [<ffffffff813f9903>] dump_stack+0x63/0x90
[149668.845154] [<ffffffff81081332>] warn_slowpath_common+0x82/0xc0
[149668.845156] [<ffffffff8108147a>] warn_slowpath_null+0x1a/0x20
[149668.845158] [<ffffffff8181cceb>] in6_dev_finish_destroy+0x6b/0xc0
[149668.845161] [<ffffffff817f29e6>] ip6_route_dev_notify+0x116/0x130
[149668.845163] [<ffffffff810a1b7a>] notifier_call_chain+0x4a/0x70
[149668.845165] [<ffffffff810a1cf6>] raw_notifier_call_chain+0x16/0x20
[149668.845168] [<ffffffff81730675>] call_netdevice_notifiers_info+0x35/0x60
[149668.845170] [<ffffffff8173ae6d>] netdev_run_todo+0x16d/0x320
[149668.845173] [<ffffffff8174646e>] rtnl_unlock+0xe/0x10
[149668.845175] [<ffffffff81733a57>] default_device_exit_batch+0x147/0x170
[149668.845179] [<ffffffff810c41a0>] ? __wake_up_sync+0x20/0x20
[149668.845181] [<ffffffff8172b8b2>] ops_exit_list.isra.4+0x52/0x60
[149668.845183] [<ffffffff8172c902>] cleanup_net+0x1c2/0x2a0
[149668.845185] [<ffffffff8109a5e5>] process_one_work+0x165/0x480
[149668.845188] [<ffffffff8109a94b>] worker_thread+0x4b/0x4c0
[149668.845190] [<ffffffff8109a900>] ? process_one_work+0x480/0x480
[149668.845192] [<ffffffff810a0c85>] kthread+0xe5/0x100
[149668.845194] [<ffffffff810a0ba0>] ? kthread_create_on_node+0x1e0/0x1e0
[149668.845197] [<ffffffff8184224f>] ret_from_fork+0x3f/0x70
[149668.845199] [<ffffffff810a0ba0>] ? kthread_create_on_node+0x1e0/0x1e0
[149668.845200] ---[ end trace a70573408f354326 ]---
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https://bugs.launchpad.net/bugs/1702910
Title:
System freeze after in6_dev_finish_destroy errors
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