Comment 21 for bug 1702164

Below is a stack trace from kern.log for one of the hosts. For security reasons, I have redacted the hostname from the output. Stack traces for other machines also mention /build/linux-0uniEn/linux-4.4.0/net/ipv6/addrconf_core.c:160 in6_dev_finish_destroy. Hopefully, this may prove useful:

Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301243] ------------[ cut here ]------------
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301252] WARNING: CPU: 22 PID: 118193 at /build/linux-0uniEn/linux-4.4.0/net/ipv6/addrconf_core.c:159 in6_dev_finish_destroy+0x6b/0xc0()
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301253] Modules linked in: veth binfmt_misc xt_nat xt_tcpudp ipt_MASQUERADE nf_nat_masquerade_ipv4 nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter ip_tables xt_conntrack x_tables nf_nat nf_conntrack br_netfilter bridge stp llc mpt3sas raid_class scsi_transport_sas mptctl mptbase dell_rbu zram lz4_compress zfs(PO) zunicode(PO) zcommon(PO) znvpair(PO) spl(O) zavl(PO) ipmi_ssif ipmi_devintf input_leds dcdbas intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp joydev kvm_intel kvm irqbypass sb_edac edac_core mei_me lpc_ich mei ipmi_si ipmi_msghandler shpchp 8250_fintek mac_hid acpi_power_meter ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 xfs btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid0 multipath linear raid1 ses enclosure crct10dif_pclmul crc32_pclmul ghash_clmulni_intel hid_generic usbhid hid mxm_wmi aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd tg3 ptp ahci pps_core libahci megaraid_sas fjes wmi
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301326] CPU: 22 PID: 118193 Comm: kworker/u384:0 Tainted: P O 4.4.0-83-generic #106-Ubuntu
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301327] Hardware name: Dell Inc. PowerEdge R430/0CN7X8, BIOS 2.2.5 09/08/2016
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301332] Workqueue: netns cleanup_net
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301334] 0000000000000286 00000000631d084a ffff880c7680bba0 ffffffff813f9513
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301337] 0000000000000000 ffffffff81d75940 ffff880c7680bbd8 ffffffff81081322
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301339] ffff881f2bb2fc00 ffff881f2bb2e000 0000000000000006 ffff880c7680bca8
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301341] Call Trace:
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301347] [<ffffffff813f9513>] dump_stack+0x63/0x90
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301352] [<ffffffff81081322>] warn_slowpath_common+0x82/0xc0
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301354] [<ffffffff8108146a>] warn_slowpath_null+0x1a/0x20
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301356] [<ffffffff8181ba0b>] in6_dev_finish_destroy+0x6b/0xc0
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301359] [<ffffffff817f17e6>] ip6_route_dev_notify+0x116/0x130
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301363] [<ffffffff810a1b1a>] notifier_call_chain+0x4a/0x70
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301365] [<ffffffff810a1c96>] raw_notifier_call_chain+0x16/0x20
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301368] [<ffffffff8172f655>] call_netdevice_notifiers_info+0x35/0x60
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301371] [<ffffffff81739e7d>] netdev_run_todo+0x16d/0x320
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301374] [<ffffffff8174540e>] rtnl_unlock+0xe/0x10
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301377] [<ffffffff81732a37>] default_device_exit_batch+0x147/0x170
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301382] [<ffffffff810c4140>] ? __wake_up_sync+0x20/0x20
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301384] [<ffffffff8172a892>] ops_exit_list.isra.4+0x52/0x60
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301386] [<ffffffff8172b8e2>] cleanup_net+0x1c2/0x2a0
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301389] [<ffffffff8109a585>] process_one_work+0x165/0x480
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301392] [<ffffffff8109a8eb>] worker_thread+0x4b/0x4c0
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301394] [<ffffffff8109a8a0>] ? process_one_work+0x480/0x480
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301396] [<ffffffff810a0c25>] kthread+0xe5/0x100
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301398] [<ffffffff810a0b40>] ? kthread_create_on_node+0x1e0/0x1e0
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301402] [<ffffffff81840f0f>] ret_from_fork+0x3f/0x70
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301403] [<ffffffff810a0b40>] ? kthread_create_on_node+0x1e0/0x1e0
Jul 24 06:15:01 <HOSTNAME REDACTED> kernel: [508525.301405] ---[ end trace e4d2860c83257caf ]---