It's starting to happen again. "top" shows that systemd-timesync is using 100% of CPU, and many errors are turning up in the kern.log and syslog:
Jun 1 20:46:57 ot08 kernel: [27109.247795] NMI watchdog: Watchdog detected hard LOCKUP on cpu 3 Jun 1 20:46:57 ot08 kernel: [27109.247797] Modules linked in: nls_iso8859_1 btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) bnep snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic i915_bpo intel_ips snd_hda_intel snd_hda_codec snd_hda_core joydev input_leds intel_rapl snd_hwdep x86_pkg_temp_thermal intel_powerclamp coretemp snd_pcm snd_seq_midi snd_seq_midi_event kvm_intel snd_rawmidi snd_seq kvm snd_seq_device snd_timer irqbypass crct10dif_pclmul crc32_pclmul snd shpchp mei_me mei aesni_intel soundcore serio_raw aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd hci_uart btbcm btqca btintel bluetooth 8250_fintek intel_lpss_acpi acpi_als intel_lpss kfifo_buf industrialio tpm_infineon acpi_pad mac_hid binfmt_misc parport_pc ppdev lp parport autofs4 uas usb_storage hid_generic hid_microsoft usbhid nouveau mxm_wmi i2c_algo_bit ttm drm_kms_helper syscopyarea e1000e sysfillrect psmou se sysimgblt fb_sys_fops ptp pps_core ahci drm libahci wmi i2c_hid video pinctrl_sunrisepoint hid pinctrl_intel fjes Jun 1 20:46:57 ot08 kernel: [27109.247833] CPU: 3 PID: 0 Comm: swapper/3 Tainted: G OE 4.4.0-22-generic #40-Ubuntu Jun 1 20:46:57 ot08 kernel: [27109.247834] Hardware name: Gigabyte Technology Co., Ltd. Z170-D3H/Z170-D3H-CF, BIOS F2 07/24/2015 Jun 1 20:46:57 ot08 kernel: [27109.247834] task: ffff880fba4cbb00 ti: ffff880fba4dc000 task.ti: ffff880fba4dc000 Jun 1 20:46:57 ot08 kernel: [27109.247835] RIP: 0010:[<ffffffff816bc421>] [<ffffffff816bc421>] cpuidle_enter_state+0x111/0x2b0 Jun 1 20:46:57 ot08 kernel: [27109.247839] RSP: 0018:ffff880fba4dfe70 EFLAGS: 00000246 Jun 1 20:46:57 ot08 kernel: [27109.247840] RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000000018 Jun 1 20:46:57 ot08 kernel: [27109.247840] RDX: 0036858fe1872cf3 RSI: 00000000004b1e6b RDI: 0000000000000000 Jun 1 20:46:57 ot08 kernel: [27109.247841] RBP: ffff880fba4dfea8 R08: 00000000000af8b3 R09: 0000000000000014 Jun 1 20:46:57 ot08 kernel: [27109.247841] R10: 0000000100663ed0 R11: 000000000000be5b R12: 0000000000000006 Jun 1 20:46:57 ot08 kernel: [27109.247842] R13: ffff880fffcdec00 R14: 000018a66d13ebb4 R15: ffffffff81eb1eb8 Jun 1 20:46:57 ot08 kernel: [27109.247843] FS: 0000000000000000(0000) GS:ffff880fffcc0000(0000) knlGS:0000000000000000 Jun 1 20:46:57 ot08 kernel: [27109.247844] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jun 1 20:46:57 ot08 kernel: [27109.247844] CR2: 00007fad3ee0a000 CR3: 0000000001e0a000 CR4: 00000000003406e0 . . . . and so on . . . Jun 1 22:10:13 ot08 kernel: [32156.713009] Code: d2 e8 7d aa 2f 00 3b 05 3b 25 e3 00 89 c1 0f 8d 99 fe ff ff 48 98 49 8b 55 00 48 03 14 c5 80 42 f3 81 8b 42 18 a8 01 74 ca f3 90 <8b> 42 18 a8 01 75 f7 eb bf 0f b6 4d d0 4c 89 fa 4c 89 f6 44 89 Jun 1 22:10:41 ot08 kernel: [32184.709855] NMI watchdog: BUG: soft lockup - CPU#4 stuck for 23s! [systemd-timesyn:18992] Jun 1 22:10:41 ot08 kernel: [32184.709857] Modules linked in: nls_iso8859_1 btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) bnep snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic i915_bpo intel_ips snd_hda_intel snd_hda_codec snd_hda_core joydev input_leds intel_rapl snd_hwdep x86_pkg_temp_thermal intel_powerclamp coretemp snd_pcm snd_seq_midi snd_seq_midi_event kvm_intel snd_rawmidi snd_seq kvm snd_seq_device snd_timer irqbypass crct10dif_pclmul crc32_pclmul snd shpchp mei_me mei aesni_intel soundcore serio_raw aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd hci_uart btbcm btqca btintel bluetooth 8250_fintek intel_lpss_acpi acpi_als intel_lpss kfifo_buf industrialio tpm_infineon acpi_pad mac_hid binfmt_misc parport_pc ppdev lp parport autofs4 uas usb_storage hid_generic hid_microsoft usbhid nouveau mxm_wmi i2c_algo_bit ttm drm_kms_helper syscopyarea e1000e sysfillrect psmou se sysimgblt fb_sys_fops ptp pps_core ahci drm libahci wmi i2c_hid video pinctrl_sunrisepoint hid pinctrl_intel fjes Jun 1 22:10:41 ot08 kernel: [32184.709921] CPU: 4 PID: 18992 Comm: systemd-timesyn Tainted: G OEL 4.4.0-22-generic #40-Ubuntu Jun 1 22:10:41 ot08 kernel: [32184.709922] Hardware name: Gigabyte Technology Co., Ltd. Z170-D3H/Z170-D3H-CF, BIOS F2 07/24/2015 Jun 1 22:10:41 ot08 kernel: [32184.709923] task: ffff880fb4ee2c40 ti: ffff880f1d684000 task.ti: ffff880f1d684000 Jun 1 22:10:41 ot08 kernel: [32184.709924] RIP: 0010:[<ffffffff81103e08>] [<ffffffff81103e08>] smp_call_function_many+0x1f8/0x260 Jun 1 22:10:41 ot08 kernel: [32184.709928] RSP: 0018:ffff880f1d687d20 EFLAGS: 00000202 Jun 1 22:10:41 ot08 kernel: [32184.709928] RAX: 0000000000000003 RBX: 0000000000000100 RCX: 0000000000000003 Jun 1 22:10:41 ot08 kernel: [32184.709929] RDX: ffff880fffcdb200 RSI: 0000000000000100 RDI: ffff880fffd17c88 Jun 1 22:10:41 ot08 kernel: [32184.709929] RBP: ffff880f1d687d58 R08: 0000000000000000 R09: 00000000000000ef Jun 1 22:10:41 ot08 kernel: [32184.709930] R10: 0000000000000004 R11: ffff880fffd17c88 R12: ffff880fffd17c88 Jun 1 22:10:41 ot08 kernel: [32184.709931] R13: ffff880fffd17c80 R14: ffffffff81035d10 R15: 0000000000000000 Jun 1 22:10:41 ot08 kernel: [32184.709931] FS: 00007f6cbc418780(0000) GS:ffff880fffd00000(0000) knlGS:0000000000000000 Jun 1 22:10:41 ot08 kernel: [32184.709932] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jun 1 22:10:41 ot08 kernel: [32184.709933] CR2: 000000000133e028 CR3: 0000000092547000 CR4: 00000000003406e0 Jun 1 22:10:41 ot08 kernel: [32184.709933] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Jun 1 22:10:41 ot08 kernel: [32184.709934] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Jun 1 22:10:41 ot08 kernel: [32184.709935] Stack: Jun 1 22:10:41 ot08 kernel: [32184.709935] 0000000000017c40 01ff880f00000001 ffffffff8171d4d7 ffffffff81035d10 Jun 1 22:10:41 ot08 kernel: [32184.709936] 0000000000000000 ffffffff8171d4d8 0000000000000001 ffff880f1d687d80 Jun 1 22:10:41 ot08 kernel: [32184.709937] ffffffff81103f4d ffffffff8171d4d7 0000000000000005 ffff880f1d687dd3 Jun 1 22:10:41 ot08 kernel: [32184.709939] Call Trace: Jun 1 22:10:41 ot08 kernel: [32184.709941] [<ffffffff8171d4d7>] ? dev_hard_start_xmit+0x137/0x3d0 Jun 1 22:10:41 ot08 kernel: [32184.709943] [<ffffffff81035d10>] ? arch_unregister_cpu+0x30/0x30 Jun 1 22:10:41 ot08 kernel: [32184.709944] [<ffffffff8171d4d8>] ? dev_hard_start_xmit+0x138/0x3d0 Jun 1 22:10:41 ot08 kernel: [32184.709946] [<ffffffff81103f4d>] on_each_cpu+0x2d/0x60 Jun 1 22:10:41 ot08 kernel: [32184.709947] [<ffffffff8171d4d7>] ? dev_hard_start_xmit+0x137/0x3d0 Jun 1 22:10:41 ot08 kernel: [32184.709948] [<ffffffff81036d0a>] text_poke_bp+0x6a/0xf0 Jun 1 22:10:41 ot08 kernel: [32184.709949] [<ffffffff8171d4d7>] ? dev_hard_start_xmit+0x137/0x3d0 Jun 1 22:10:41 ot08 kernel: [32184.709951] [<ffffffff810339fb>] arch_jump_label_transform+0x9b/0x120 Jun 1 22:10:41 ot08 kernel: [32184.709952] [<ffffffff8118ad6c>] __jump_label_update+0x6c/0x80 Jun 1 22:10:41 ot08 kernel: [32184.709954] [<ffffffff8118ae08>] jump_label_update+0x88/0x90 Jun 1 22:10:41 ot08 kernel: [32184.709955] [<ffffffff8118b014>] static_key_slow_inc+0x94/0xa0 Jun 1 22:10:41 ot08 kernel: [32184.709957] [<ffffffff81715c0b>] net_enable_timestamp+0x3b/0x40 Jun 1 22:10:41 ot08 kernel: [32184.709959] [<ffffffff81704d86>] sock_enable_timestamp+0x36/0x40 Jun 1 22:10:41 ot08 kernel: [32184.709960] [<ffffffff817050f6>] sock_setsockopt+0x366/0x810 Jun 1 22:10:41 ot08 kernel: [32184.709962] [<ffffffff813838b2>] ? apparmor_socket_setsockopt+0x22/0x30 Jun 1 22:10:41 ot08 kernel: [32184.709964] [<ffffffff816ffe2d>] SyS_setsockopt+0xcd/0xe0 Jun 1 22:10:41 ot08 kernel: [32184.709966] [<ffffffff818252f2>] entry_SYSCALL_64_fastpath+0x16/0x71 Jun 1 22:10:41 ot08 kernel: [32184.709966] Code: d2 e8 7d aa 2f 00 3b 05 3b 25 e3 00 89 c1 0f 8d 99 fe ff ff 48 98 49 8b 55 00 48 03 14 c5 80 42 f3 81 8b 42 18 a8 01 74 ca f3 90 <8b> 42 18 a8 01 75 f7 eb bf 0f b6 4d d0 4c 89 fa 4c 89 f6 44 89 Jun 1 22:10:57 ot08 kernel: [32200.320164] INFO: rcu_sched detected stalls on CPUs/tasks: Jun 1 22:10:57 ot08 kernel: [32200.320167] 3-...: (1 GPs behind) idle=5a3/1/0 softirq=695357/695357 fqs=1274786 Jun 1 22:10:57 ot08 kernel: [32200.320185] (detected by 0, t=1275142 jiffies, g=527400, c=527399, q=17000) Jun 1 22:10:57 ot08 kernel: [32200.320186] Task dump for CPU 3: Jun 1 22:10:57 ot08 kernel: [32200.320187] swapper/3 R running task 0 0 1 0x00000008 Jun 1 22:10:57 ot08 kernel: [32200.320189] ffff880fba4dfe70 0000000000000018 00000000ffcd3b00 000018a66d41fc67 Jun 1 22:10:57 ot08 kernel: [32200.320191] ffffffff81f35140 ffff880fba4e0000 ffff880fffcdec00 ffffffff81eb1c60 Jun 1 22:10:57 ot08 kernel: [32200.320192] ffff880fba4dc000 ffff880fba4dfeb8 ffffffff816bc5f7 ffff880fba4dfed0 Jun 1 22:10:57 ot08 kernel: [32200.320193] Call Trace: Jun 1 22:10:57 ot08 kernel: [32200.320197] [<ffffffff816bc5f7>] ? cpuidle_enter+0x17/0x20 Jun 1 22:10:57 ot08 kernel: [32200.320200] [<ffffffff810c3db2>] ? call_cpuidle+0x32/0x60 Jun 1 22:10:57 ot08 kernel: [32200.320201] [<ffffffff816bc5d3>] ? cpuidle_select+0x13/0x20 Jun 1 22:10:57 ot08 kernel: [32200.320203] [<ffffffff810c4070>] ? cpu_startup_entry+0x290/0x350 Jun 1 22:10:57 ot08 kernel: [32200.320205] [<ffffffff81051714>] ? start_secondary+0x154/0x190 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1587730 Title: graphic system freezes after a while, can still ssh into machine To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1587730/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
