Public bug reported: After a kernel update, the machine wedges during late boot.
Symptoms: * lightdm never gets a chance to start because things like gpu-manager are wedged, and must start before it * gpu-manager uses 100% cpu * sudo / ip / anything that uses netlink hangs forever and can't be ^C'd * can't reboot; processes like network-manager are wedged and unkillable I'm running a relatively standard Zesty install, with a couple of extra packages (e.g. official Docker). Laptop is a generic unbranded desktop- replacement from https://pcspecialist.co.uk/. My guess at the problem is these blocked kernel threads: [ 39.105233] sysrq: SysRq : Show Blocked State [ 39.105248] task PC stack pid father [ 39.105265] kworker/0:1 D 0 67 2 0x00000000 [ 39.105270] Workqueue: kec_query acpi_ec_event_processor [ 39.105271] Call Trace: [ 39.105273] __schedule+0x233/0x6f0 [ 39.105274] schedule+0x36/0x80 [ 39.105275] schedule_timeout+0x22a/0x3f0 [ 39.105276] ? del_timer_sync+0x48/0x50 [ 39.105277] ? schedule_timeout+0x1e7/0x3f0 [ 39.105277] __down_timeout+0x7d/0xd0 [ 39.105278] down_timeout+0x4c/0x60 [ 39.105280] acpi_os_wait_semaphore+0x56/0x70 [ 39.105281] acpi_ut_acquire_mutex+0x46/0x80 [ 39.105282] acpi_ns_get_node+0x28/0x58 [ 39.105283] acpi_ns_evaluate+0x52/0x252 [ 39.105284] acpi_evaluate_object+0x148/0x258 [ 39.105285] acpi_ec_event_processor+0x6e/0xa0 [ 39.105286] process_one_work+0x1fc/0x4b0 [ 39.105287] worker_thread+0x4b/0x500 [ 39.105288] kthread+0x109/0x140 [ 39.105289] ? process_one_work+0x4b0/0x4b0 [ 39.105290] ? kthread_create_on_node+0x60/0x60 [ 39.105291] ret_from_fork+0x2c/0x40 Googlin' this stack trace gets basically nothing. I have had no other problems (no weird hangs, ...) with this machine on previous kernels. The binary nVidia driver does cause issues, but I don't use it. ProblemType: Bug DistroRelease: Ubuntu 17.04 Package: linux-image-4.10.0-22-generic 4.10.0-22.24 ProcVersionSignature: Ubuntu 4.10.0-21.23-generic 4.10.11 Uname: Linux 4.10.0-21-generic x86_64 ApportVersion: 2.20.4-0ubuntu4.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: faux 2840 F.... pulseaudio Date: Thu Jun 8 08:16:01 2017 HibernationDevice: RESUME=UUID=90cfcad3-decf-4ee3-acee-22da8e067a01 InstallationDate: Installed on 2017-02-24 (103 days ago) InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2) MachineType: Notebook N85_N87,HJ,HJ1,HK1 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.10.0-21-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro RelatedPackageVersions: linux-restricted-modules-4.10.0-21-generic N/A linux-backports-modules-4.10.0-21-generic N/A linux-firmware 1.164.1 SourcePackage: linux UpgradeStatus: Upgraded to zesty on 2017-04-26 (42 days ago) dmi.bios.date: 01/23/2017 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1.05.07 dmi.board.asset.tag: Tag 12345 dmi.board.name: N85_N87,HJ,HJ1,HK1 dmi.board.vendor: Notebook dmi.board.version: Not Applicable dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: Notebook dmi.chassis.version: N/A dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.05.07:bd01/23/2017:svnNotebook:pnN85_N87,HJ,HJ1,HK1:pvrNotApplicable:rvnNotebook:rnN85_N87,HJ,HJ1,HK1:rvrNotApplicable:cvnNotebook:ct10:cvrN/A: dmi.product.name: N85_N87,HJ,HJ1,HK1 dmi.product.version: Not Applicable dmi.sys.vendor: Notebook ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug zesty ** Attachment added: "dmesg + sysrq+w on the hung boot" https://bugs.launchpad.net/bugs/1696665/+attachment/4892039/+files/wedged-boot.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1696665 Title: Boot wedges on 4.10.0-22 but not on -21 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1696665/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
