Ubuntu
linux package

Boot wedges on 4.10.0-22 but not on -21

Bug #1696665 reported by Chris West on 2017-06-08

This bug affects 4 people

Affects		Status	Importance	Assigned to	Milestone
	linux (Ubuntu)	Confirmed	High	Unassigned

Bug Description

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

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