Today, after making some updates the issue still exists, but the shutdown screen got a little bit more verbose.
It tells me "A stop job is running for Light Display Manager" followed by the original error from this issue. If i do the following i can shut down: 1) sudo systemctl stop lightdm.service 2) switch to tty1 (ctrl+alt+f1) 3) sudo poweroff If i type "sudo systemctl stop lightdm.service && sudo poweroff" it wont work The lightdm logs only contain 1 non-debug output: [+33.52s] CRITICAL: session_get_login1_session_id: assertion 'session != NULL' failed The lightdm/x-0.log.1.gz contains some errors too Errors from xkbcomp are not fatal to the X server (EE) (EE) Backtrace: (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4e) [0x55b252dc7c6e] (EE) 1: /usr/lib/xorg/Xorg (0x55b252c15000+0x1b6ff9) [0x55b252dcbff9] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f68dad65000+0x354b0) [0x7f68dad9a4b0] (EE) 3: /usr/lib/xorg/modules/libfb.so (_fbGetWindowPixmap+0xd) [0x7f68d4028bdd] (EE) 4: /usr/lib/xorg/Xorg (0x55b252c15000+0x1353d7) [0x55b252d4a3d7] (EE) 5: /usr/lib/xorg/Xorg (0x55b252c15000+0x1354a5) [0x55b252d4a4a5] (EE) 6: /usr/lib/xorg/Xorg (0x55b252c15000+0x135c12) [0x55b252d4ac12] (EE) 7: /usr/lib/xorg/Xorg (0x55b252c15000+0x1347c3) [0x55b252d497c3] (EE) 8: /usr/lib/xorg/Xorg (0x55b252c15000+0xe4c58) [0x55b252cf9c58] (EE) 9: /usr/lib/xorg/Xorg (0x55b252c15000+0x132b64) [0x55b252d47b64] (EE) 10: /usr/lib/xorg/Xorg (0x55b252c15000+0x57f17) [0x55b252c6cf17] (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7f68dad85830] (EE) 12: /usr/lib/xorg/Xorg (_start+0x29) [0x55b252c57069] (EE) (EE) Segmentation fault at address 0x10 (EE) Fatal server error: (EE) Caught signal 11 (Segmentation fault). Server aborting (EE) (EE) Both logs contain the following strings (maybe some redirected input?): ^@^@^@^@^@ (this goes on for some time) I hope this is of some help for you -- 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/1530405 Title: NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kerneloops:814] Status in linux package in Ubuntu: Triaged Bug description: I'm using Ubuntu Xenial 16.04 and my computer (ASUS M32BF) will randomly freeze up, sometimes before the login screen, sometimes while I'm in the middle of using a program. This sometimes happens on the Wily 15.10 live cd as well, and on both kernel 4.3.0-2, and kernel 4.2.0-22. Important part of log: Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112129] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kerneloops:814] Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112134] Modules linked in: rfcomm bnep nls_iso8859_1 kvm_amd kvm eeepc_wmi asus_wmi crct10dif_pclmul sparse_keymap crc32_pclmul aesni_intel aes_x86_64 arc4 lrw gf128mul rtl8821ae glue_helper snd_hda_codec_realtek ablk_helper snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel btcoexist snd_hda_codec rtl_pci snd_hda_core joydev input_leds snd_hwdep rtlwifi snd_pcm fam15h_power cryptd snd_seq_midi serio_raw snd_seq_midi_event snd_rawmidi mac80211 snd_seq snd_seq_device snd_timer cfg80211 btusb btrtl btbcm btintel bluetooth snd soundcore edac_mce_amd k10temp edac_core i2c_piix4 shpchp mac_hid parport_pc ppdev lp parport autofs4 hid_logitech_hidpp uas usb_storage hid_logitech_dj usbhid hid amdkfd amd_iommu_v2 radeon i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops r8169 psmouse mii drm ahci libahci wmi fjes video Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112183] CPU: 0 PID: 814 Comm: kerneloops Not tainted 4.3.0-2-generic #11-Ubuntu Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112184] Hardware name: ASUSTeK COMPUTER INC. K30BF_M32BF_A_F_K31BF_6/K30BF_M32BF_A_F_K31BF_6, BIOS 0501 07/09/2015 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112186] task: ffff88031146d400 ti: ffff88030e838000 task.ti: ffff88030e838000 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112188] RIP: 0010:[<ffffffff810819d6>] [<ffffffff810819d6>] __do_softirq+0x76/0x250 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112194] RSP: 0018:ffff88031fc03f30 EFLAGS: 00000202 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112196] RAX: ffff88030e83c000 RBX: 0000000000000000 RCX: 0000000040400040 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112197] RDX: 0000000000000000 RSI: 000000000000613e RDI: 0000000000000380 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112198] RBP: ffff88031fc03f80 R08: 00000029f8fa1411 R09: ffff88031fc169f0 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112199] R10: 0000000000000020 R11: 0000000000000004 R12: ffff88031fc169c0 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112201] R13: ffff88030df8e200 R14: 0000000000000000 R15: 0000000000000001 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112202] FS: 00007f6c266ac880(0000) GS:ffff88031fc00000(0000) knlGS:0000000000000000 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112203] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112205] CR2: 00007ffef000bff8 CR3: 000000030f368000 CR4: 00000000000406f0 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112206] Stack: Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112207] 404000401fc03f78 ffff88030e83c000 00000000ffff0121 ffff88030000000a Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112209] 000000021fc0d640 0000000000000000 ffff88031fc169c0 ffff88030df8e200 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112211] 0000000000000000 0000000000000001 ffff88031fc03f90 ffffffff81081d23 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112213] Call Trace: Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112215] <IRQ> Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112219] [<ffffffff81081d23>] irq_exit+0xa3/0xb0 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112222] [<ffffffff817fda02>] smp_apic_timer_interrupt+0x42/0x50 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112225] [<ffffffff817fb862>] apic_timer_interrupt+0x82/0x90 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112226] <EOI> Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112230] [<ffffffff810a5457>] ? finish_task_switch+0x67/0x1c0 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112232] [<ffffffff817f645c>] __schedule+0x36c/0x980 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112234] [<ffffffff817f6aa3>] schedule+0x33/0x80 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112236] [<ffffffff817f9e4f>] do_nanosleep+0x6f/0xf0 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112239] [<ffffffff810ea59c>] hrtimer_nanosleep+0xdc/0x1f0 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112241] [<ffffffff810e9500>] ? __hrtimer_init+0x90/0x90 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112243] [<ffffffff817f9e3a>] ? do_nanosleep+0x5a/0xf0 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112245] [<ffffffff810ea72a>] SyS_nanosleep+0x7a/0x90 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112247] [<ffffffff817faaf2>] entry_SYSCALL_64_fastpath+0x16/0x71 Dec 31 19:13:12 COMPUTERNAME kernel: [ 64.112248] Code: 45 d4 89 4d b4 65 48 8b 04 25 c4 3e 01 00 c7 45 c8 0a 00 00 00 48 89 45 b8 65 c7 05 31 24 f9 7e 00 00 00 00 fb 66 0f 1f 44 00 00 <b8> ff ff ff ff 49 c7 c4 c0 b0 e0 81 0f bc 45 d4 83 c0 01 89 45 This soft lockup happens either in kerneloops or swapper/0. This might have something to do with networking, because the soft lockups appear happen immediately before or after some network-related stuff. nm-applet says NetworkManager is not running, but "service network-manager status" says it is. "service network-manager stop" does not work, and I need to "kill -9" the pids for the processes. After starting the service after killing it, it the nm-applet's "Edit Connection" works for a few moments, then it won't delete any connections, and when closed, it won't re-open. At then end "kill -9" won't even work anymore (the processes get parented to init, but do not die). Usually, however, I never even see the login screen. I've been able to boot into the Wily livecd by using Windows 10 -> Shift-Restart -> UEFI Settings -> then booting my USB with the livecd (often soft lockups without going through windows). 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