Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.7 kernel[0]. If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7 ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1606795 Title: BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 Status in linux package in Ubuntu: Incomplete Bug description: Jul 26 22:42:17 app-server-50 kernel: [581429.462692] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 Jul 26 22:42:17 app-server-50 kernel: [581429.462763] IP: [<ffffffff810988aa>] set_task_cpu+0xba/0x1c0 Jul 26 22:42:17 app-server-50 kernel: [581429.462791] PGD a9e6c067 PUD 211c4067 PMD 0 Jul 26 22:42:17 app-server-50 kernel: [581429.462811] Oops: 0000 [#1] SMP Jul 26 22:42:17 app-server-50 kernel: [581429.462826] Modules linked in: xt_recent ip6t_REJECT xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT xt_LOG xt_lim it xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack coretemp crct10dif_pclmul crc32_pclmul ip6table_filter vmw_balloon ip6_tables nf_conntrack_netbio s_ns nf_conntrack_broadcast aesni_intel nf_nat_ftp aes_x86_64 nf_nat lrw gf128mul nf_conntrack_ftp nf_conntrack glue_helper ablk_helper iptable_filter cryptd serio_raw ip_tables x_tables vmwgfx ttm drm i2c_piix4 vmw_vmci shpchp mac_hid lp parport psmouse floppy mptspi mptscsih e1000 mptbase pata_acpi Jul 26 22:42:17 app-server-50 kernel: [581429.463056] CPU: 2 PID: 11402 Comm: icinga2 Not tainted 3.13.0-79-generic #123-Ubuntu Jul 26 22:42:17 app-server-50 kernel: [581429.463083] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 09/30/2014 Jul 26 22:42:17 app-server-50 kernel: [581429.463118] task: ffff8801357d3000 ti: ffff880009d26000 task.ti: ffff880009d26000 Jul 26 22:42:17 app-server-50 kernel: [581429.463143] RIP: 0010:[<ffffffff810988aa>] [<ffffffff810988aa>] set_task_cpu+0xba/0x1c0 Jul 26 22:42:17 app-server-50 kernel: [581429.463172] RSP: 0018:ffff880009d27d50 EFLAGS: 00010046 Jul 26 22:42:17 app-server-50 kernel: [581429.463190] RAX: 0000000000000003 RBX: ffff880009d27d50 RCX: 0000000000000000 Jul 26 22:42:17 app-server-50 kernel: [581429.464733] RDX: ffff880068595000 RSI: 0000000000000000 RDI: ffffffff81ebe3d8 Jul 26 22:42:17 app-server-50 kernel: [581429.464757] RBP: ffff880009d27e10 R08: 0000000000000000 R09: 0000000000000004 Jul 26 22:42:17 app-server-50 kernel: [581429.464779] R10: 0000000000000400 R11: 0000000000000000 R12: ffff8800b87b4800 Jul 26 22:42:17 app-server-50 kernel: [581429.464801] R13: 0000000000000003 R14: 0000000000000004 R15: 0000000000000003 Jul 26 22:42:17 app-server-50 kernel: [581429.464823] FS: 00007f9e727e7700(0000) GS:ffff88013fd00000(0000) knlGS:0000000000000000 Jul 26 22:42:17 app-server-50 kernel: [581429.464848] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jul 26 22:42:17 app-server-50 kernel: [581429.464866] CR2: 0000000000000018 CR3: 00000000a9fe3000 CR4: 00000000001407e0 Jul 26 22:42:17 app-server-50 kernel: [581429.464932] Stack: Jul 26 22:42:17 app-server-50 kernel: [581429.464941] ffff8800b87b4800 0000000300000001 ffff880139438458 ffff880009d27e10 Jul 26 22:42:17 app-server-50 kernel: [581429.464968] ffffffff810a018e ffff880008ae4008 ffff88006846d300 ffff880009d27e20 Jul 26 22:42:17 app-server-50 kernel: [581429.464994] ffffffff8117a872 0000000000000010 ffff8800a9fda240 ffff8800b942de10 Jul 26 22:42:17 app-server-50 kernel: [581429.465026] Call Trace: Jul 26 22:42:17 app-server-50 kernel: [581429.465040] [<ffffffff810a018e>] ? select_task_rq_fair+0x62e/0x6f0 Jul 26 22:42:17 app-server-50 kernel: [581429.465064] [<ffffffff8117a872>] ? handle_mm_fault+0x882/0xf10 Jul 26 22:42:17 app-server-50 kernel: [581429.465085] [<ffffffff8109a8b6>] try_to_wake_up+0x186/0x2c0 Jul 26 22:42:17 app-server-50 kernel: [581429.465106] [<ffffffff817319b4>] ? __do_page_fault+0x204/0x570 Jul 26 22:42:17 app-server-50 kernel: [581429.465760] [<ffffffff8109aa42>] default_wake_function+0x12/0x20 Jul 26 22:42:17 app-server-50 kernel: [581429.466379] [<ffffffff810aadf8>] __wake_up_common+0x58/0x90 Jul 26 22:42:17 app-server-50 kernel: [581429.467066] [<ffffffff810aae43>] __wake_up_locked+0x13/0x20 Jul 26 22:42:17 app-server-50 kernel: [581429.468014] [<ffffffff81207e75>] SyS_epoll_ctl+0x725/0x9f0 Jul 26 22:42:17 app-server-50 kernel: [581429.468637] [<ffffffff817363dd>] system_call_fastpath+0x1a/0x1f Jul 26 22:42:17 app-server-50 kernel: [581429.469214] Code: d0 e3 eb 81 8b 40 18 44 89 ad 4c ff ff ff 89 85 48 ff ff ff e8 88 96 69 00 49 8b 94 24 10 02 00 00 44 89 e8 48 8b 8a 90 00 00 00 <48> 8b 0c c1 49 89 8c 24 b0 01 00 00 48 8b 92 88 00 00 00 48 8b Jul 26 22:42:17 app-server-50 kernel: [581429.471069] RIP [<ffffffff810988aa>] set_task_cpu+0xba/0x1c0 Jul 26 22:42:17 app-server-50 kernel: [581429.471687] RSP <ffff880009d27d50> Jul 26 22:42:17 app-server-50 kernel: [581429.472263] CR2: 0000000000000018 Jul 26 22:42:17 app-server-50 kernel: [581429.473819] ---[ end trace fe79ad2d0ae4fae3 ]--- ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Jul 26 23:18:37 app-server-50 rsyslogd: [origin software="rsyslogd" swVersion="7.4.4" x-pid="597" x-info="http://www.rsyslog.com";] start Jul 26 23:18:37 app-server-50 rsyslogd: rsyslogd's groupid changed to 104 Jul 26 23:18:37 app-server-50 rsyslogd: rsyslogd's userid changed to 101 Jul 26 23:18:37 app-server-50 kernel: [ 0.000000] Initializing cgroup subsys cpuset Jul 26 23:18:37 app-server-50 kernel: [ 0.000000] Initializing cgroup subsys cpu Jul 26 23:18:37 app-server-50 kernel: [ 0.000000] Initializing cgroup subsys cpuacct Jul 26 23:18:37 app-server-50 kernel: [ 0.000000] Linux version 3.13.0-79-generic (buildd@lcy01-24) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #123-Ubuntu SMP Fri Feb 19 14:27:58 UTC 2016 (Ubuntu 3.13.0-79.123-generic 3.13.11-ckt33) Jul 26 23:18:37 app-server-50 kernel: [ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.13.0-79-generic root=/dev/mapper/sci--ubuntu--vg-root ro Jul 26 23:18:37 app-server-50 kernel: [ 0.000000] KERNEL supported cpus: To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1606795/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
