I just realized why I thought this was not predictable. The system continues to function just fine after the Oops *until* I close my laptop. Once I close my laptop the whole thing freezes and does not recover. Attaching one last kernel log and then will leave it alone till someone asks for more detail.
** Attachment added: "kern3.log" https://bugs.launchpad.net/ubuntu/+source/linux-signed/+bug/1767452/+attachment/5131578/+files/kern3.log -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-signed in Ubuntu. https://bugs.launchpad.net/bugs/1767452 Title: kernel oops when I undocked Status in linux-signed package in Ubuntu: Confirmed Bug description: Here's a snippet from the kernel log which I think will make the actual issue clear: Apr 27 09:49:20 caliburn kernel: [ 4558.910412] pcieport 0000:0a:03.0: Refused to change power state, currently in D3 Apr 27 09:49:20 caliburn kernel: [ 4558.917717] xhci_hcd 0000:0d:00.0: remove, state 1 Apr 27 09:49:20 caliburn kernel: [ 4558.917724] usb usb6: USB disconnect, device number 1 Apr 27 09:49:20 caliburn kernel: [ 4558.917725] usb 6-1: USB disconnect, device number 2 Apr 27 09:49:20 caliburn kernel: [ 4558.917774] xhci_hcd 0000:0d:00.0: xHCI host controller not responding, assume dead Apr 27 09:49:20 caliburn kernel: [ 4558.968688] xhci_hcd 0000:0d:00.0: USB bus 6 deregistered Apr 27 09:49:20 caliburn kernel: [ 4558.968694] xhci_hcd 0000:0d:00.0: remove, state 1 Apr 27 09:49:20 caliburn kernel: [ 4558.968700] usb usb5: USB disconnect, device number 1 Apr 27 09:49:20 caliburn kernel: [ 4558.968701] usb 5-3: USB disconnect, device number 3 Apr 27 09:49:20 caliburn kernel: [ 4559.076020] usb 5-4: USB disconnect, device number 4 Apr 27 09:49:20 caliburn kernel: [ 4559.076023] usb 5-4.2: USB disconnect, device number 5 Apr 27 09:49:20 caliburn kernel: [ 4559.123365] usb 5-4.4: USB disconnect, device number 7 Apr 27 09:49:20 caliburn kernel: [ 4559.125340] xhci_hcd 0000:0d:00.0: Host halt failed, -19 Apr 27 09:49:20 caliburn kernel: [ 4559.125343] xhci_hcd 0000:0d:00.0: Host not accessible, reset failed. Apr 27 09:49:20 caliburn kernel: [ 4559.125467] xhci_hcd 0000:0d:00.0: USB bus 5 deregistered Apr 27 09:49:21 caliburn kernel: [ 4559.146170] pcieport 0000:0a:02.0: Refused to change power state, currently in D3 Apr 27 09:49:21 caliburn kernel: [ 4559.147809] pcieport 0000:0a:01.0: Refused to change power state, currently in D3 Apr 27 09:49:21 caliburn kernel: [ 4559.149445] xhci_hcd 0000:0b:00.0: remove, state 4 Apr 27 09:49:21 caliburn kernel: [ 4559.149451] usb usb4: USB disconnect, device number 1 Apr 27 09:49:21 caliburn kernel: [ 4559.149700] xhci_hcd 0000:0b:00.0: USB bus 4 deregistered Apr 27 09:49:21 caliburn kernel: [ 4559.149706] xhci_hcd 0000:0b:00.0: xHCI host controller not responding, assume dead Apr 27 09:49:21 caliburn kernel: [ 4559.149718] xhci_hcd 0000:0b:00.0: remove, state 1 Apr 27 09:49:21 caliburn kernel: [ 4559.149722] usb usb3: USB disconnect, device number 1 Apr 27 09:49:21 caliburn kernel: [ 4559.149724] usb 3-1: USB disconnect, device number 2 Apr 27 09:49:21 caliburn kernel: [ 4559.206497] usb 3-2: USB disconnect, device number 3 Apr 27 09:49:21 caliburn kernel: [ 4559.462604] usb 3-4: USB disconnect, device number 4 Apr 27 09:49:21 caliburn kernel: [ 4559.464185] BUG: unable to handle kernel NULL pointer dereference at 0000000000000034 Apr 27 09:49:21 caliburn kernel: [ 4559.464193] IP: tty_unregister_driver+0xd/0x70 Apr 27 09:49:21 caliburn kernel: [ 4559.464195] PGD 0 P4D 0 Apr 27 09:49:21 caliburn kernel: [ 4559.464197] Oops: 0000 [#1] SMP PTI Apr 27 09:49:21 caliburn kernel: [ 4559.464199] Modules linked in: veth 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 xt_conntrack nf_nat nf_conntrack libcrc32c br_netfilter bridge stp llc overlay hid_led hid_generic snd_usb_audio snd_usbmidi_lib usbhid cdc_ether usbnet r8152 mii bnep nls_iso8859_1 snd_soc_skl snd_soc_skl_ipc snd_seq_midi snd_hda_ext_core snd_seq_midi_event arc4 snd_soc_sst_dsp intel_rapl snd_soc_sst_ipc snd_rawmidi x86_pkg_temp_thermal snd_soc_acpi intel_powerclamp snd_hda_codec_hdmi coretemp snd_hda_codec_conexant snd_hda_codec_generic kvm_intel snd_soc_core snd_compress ac97_bus kvm snd_pcm_dmaengine snd_seq irqbypass intel_cstate intel_rapl_perf snd_hda_intel joydev uvcvideo input_leds Apr 27 09:49:21 caliburn kernel: [ 4559.464233] serio_raw snd_hda_codec thinkpad_acpi videobuf2_vmalloc videobuf2_memops nvram videobuf2_v4l2 iwlmvm snd_hda_core snd_hwdep videobuf2_core wmi_bmof intel_wmi_thunderbolt snd_pcm mac80211 snd_seq_device snd_timer videodev btusb media btrtl btbcm btintel iwlwifi mei_me bluetooth cfg80211 rtsx_pci_ms memstick snd ecdh_generic mei ucsi_acpi typec_ucsi intel_pch_thermal typec shpchp soundcore tpm_crb mac_hid acpi_pad sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 algif_skcipher af_alg dm_crypt rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc i915 aesni_intel i2c_algo_bit aes_x86_64 drm_kms_helper crypto_simd e1000e glue_helper cryptd syscopyarea psmouse sysfillrect sysimgblt nvme ptp fb_sys_fops pps_core thunderbolt nvme_core drm rtsx_pci wmi i2c_hid Apr 27 09:49:21 caliburn kernel: [ 4559.464273] video hid Apr 27 09:49:21 caliburn kernel: [ 4559.464276] CPU: 1 PID: 35555 Comm: kworker/u8:1 Not tainted 4.15.0-20-generic #21-Ubuntu Apr 27 09:49:21 caliburn kernel: [ 4559.464278] Hardware name: LENOVO 20HR000FUS/20HR000FUS, BIOS N1MET39W (1.24 ) 09/27/2017 Apr 27 09:49:21 caliburn kernel: [ 4559.464281] Workqueue: kacpi_hotplug acpi_hotplug_work_fn Apr 27 09:49:21 caliburn kernel: [ 4559.464285] RIP: 0010:tty_unregister_driver+0xd/0x70 Apr 27 09:49:21 caliburn kernel: [ 4559.464286] RSP: 0000:ffffb5964451faf0 EFLAGS: 00010246 Apr 27 09:49:21 caliburn kernel: [ 4559.464288] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 Apr 27 09:49:21 caliburn kernel: [ 4559.464289] RDX: ffff8e754ba5de00 RSI: ffffee6c52323ac0 RDI: 0000000000000000 Apr 27 09:49:21 caliburn kernel: [ 4559.464290] RBP: ffffb5964451faf8 R08: ffff8e754c8eb908 R09: 00000001801e0017 Apr 27 09:49:21 caliburn kernel: [ 4559.464292] R10: ffffee6c5228a800 R11: 0000000000000000 R12: ffff8e754b060230 Apr 27 09:49:21 caliburn kernel: [ 4559.464293] R13: ffff8e754b06027c R14: ffff8e754b060390 R15: 0000000000000060 Apr 27 09:49:21 caliburn kernel: [ 4559.464294] FS: 0000000000000000(0000) GS:ffff8e7561480000(0000) knlGS:0000000000000000 Apr 27 09:49:21 caliburn kernel: [ 4559.464296] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Apr 27 09:49:21 caliburn kernel: [ 4559.464297] CR2: 0000000000000034 CR3: 000000048280a005 CR4: 00000000003606e0 Apr 27 09:49:21 caliburn kernel: [ 4559.464299] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Apr 27 09:49:21 caliburn kernel: [ 4559.464300] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Apr 27 09:49:21 caliburn kernel: [ 4559.464300] Call Trace: Apr 27 09:49:21 caliburn kernel: [ 4559.464305] xhci_dbc_tty_unregister_driver+0x15/0x30 Apr 27 09:49:21 caliburn kernel: [ 4559.464307] xhci_dbc_exit+0x2e/0x50 Apr 27 09:49:21 caliburn kernel: [ 4559.464309] xhci_stop+0x5b/0x1e0 Apr 27 09:49:21 caliburn kernel: [ 4559.464312] usb_remove_hcd+0x105/0x250 Apr 27 09:49:21 caliburn kernel: [ 4559.464314] usb_hcd_pci_remove+0x74/0x130 Apr 27 09:49:21 caliburn kernel: [ 4559.464317] xhci_pci_remove+0x6b/0x70 Apr 27 09:49:21 caliburn kernel: [ 4559.464320] pci_device_remove+0x3e/0xb0 Apr 27 09:49:21 caliburn kernel: [ 4559.464323] device_release_driver_internal+0x15b/0x220 Apr 27 09:49:21 caliburn kernel: [ 4559.464325] device_release_driver+0x12/0x20 Apr 27 09:49:21 caliburn kernel: [ 4559.464328] pci_stop_bus_device+0x7f/0xa0 Apr 27 09:49:21 caliburn kernel: [ 4559.464330] pci_stop_bus_device+0x30/0xa0 Apr 27 09:49:21 caliburn kernel: [ 4559.464333] pci_stop_bus_device+0x41/0xa0 Apr 27 09:49:21 caliburn kernel: [ 4559.464335] pci_stop_and_remove_bus_device+0x12/0x20 Apr 27 09:49:21 caliburn kernel: [ 4559.464338] trim_stale_devices+0x11d/0x150 Apr 27 09:49:21 caliburn kernel: [ 4559.464340] trim_stale_devices+0xa9/0x150 Apr 27 09:49:21 caliburn kernel: [ 4559.464342] trim_stale_devices+0xbb/0x150 Apr 27 09:49:21 caliburn kernel: [ 4559.464343] ? get_slot_status+0xa3/0xe0 Apr 27 09:49:21 caliburn kernel: [ 4559.464346] acpiphp_check_bridge.part.7+0x100/0x140 Apr 27 09:49:21 caliburn kernel: [ 4559.464348] acpiphp_hotplug_notify+0x18e/0x220 Apr 27 09:49:21 caliburn kernel: [ 4559.464349] ? free_bridge+0x100/0x100 Apr 27 09:49:21 caliburn kernel: [ 4559.464351] acpi_device_hotplug+0xa4/0x4b0 Apr 27 09:49:21 caliburn kernel: [ 4559.464353] acpi_hotplug_work_fn+0x1e/0x30 Apr 27 09:49:21 caliburn kernel: [ 4559.464356] process_one_work+0x1de/0x410 Apr 27 09:49:21 caliburn kernel: [ 4559.464358] worker_thread+0x32/0x410 Apr 27 09:49:21 caliburn kernel: [ 4559.464360] kthread+0x121/0x140 Apr 27 09:49:21 caliburn kernel: [ 4559.464362] ? process_one_work+0x410/0x410 Apr 27 09:49:21 caliburn kernel: [ 4559.464364] ? kthread_create_worker_on_cpu+0x70/0x70 Apr 27 09:49:21 caliburn kernel: [ 4559.464367] ? do_syscall_64+0x73/0x130 Apr 27 09:49:21 caliburn kernel: [ 4559.464369] ? SyS_exit_group+0x14/0x20 Apr 27 09:49:21 caliburn kernel: [ 4559.464371] ret_from_fork+0x35/0x40 Apr 27 09:49:21 caliburn kernel: [ 4559.464372] Code: c2 bf 2c 54 b4 48 c7 c7 90 0d a4 b4 e8 ed 92 ee ff 48 89 df e8 85 c7 c6 ff 5b 5d c3 66 90 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb <8b> 77 34 8b 7f 2c c1 e7 14 0b 7b 30 e8 22 15 ca ff 48 c7 c7 e0 Apr 27 09:49:21 caliburn kernel: [ 4559.464396] RIP: tty_unregister_driver+0xd/0x70 RSP: ffffb5964451faf0 Apr 27 09:49:21 caliburn kernel: [ 4559.464396] CR2: 0000000000000034 Apr 27 09:49:21 caliburn kernel: [ 4559.464398] ---[ end trace eca0969987c11306 ]--- Apr 27 09:49:21 caliburn kernel: [ 4559.515107] thinkpad_acpi: EC reports that Thermal Table has changed Apr 27 09:49:22 caliburn kernel: [ 4560.472897] audit: type=1107 audit(1524847762.333:50): pid=937 uid=103 auid=4294967295 ses=4294967295 msg='apparmor="DENIED" operation="dbus_signal" bus="system" path="/org/freedesktop/login1" interface="org.freedesktop.login1.Manager" member="PrepareForSleep" name=":1.10" mask="receive" pid=4254 label="snap.keepassxc.keepassxc" peer_pid=899 peer_label="unconfined" Apr 27 09:49:22 caliburn kernel: [ 4560.472897] exe="/usr/bin/dbus-daemon" sauid=103 hostname=? addr=? terminal=?' Apr 27 09:49:22 caliburn kernel: [ 4560.947925] PM: suspend entry (deep) ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-20-generic 4.15.0-20.21 ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17 Uname: Linux 4.15.0-20-generic x86_64 ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 Date: Fri Apr 27 10:31:58 2018 InstallationDate: Installed on 2018-04-27 (0 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) SourcePackage: linux-signed UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed/+bug/1767452/+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
