Thunderbolt hotplug causes system hang

[Thibault Roche]

I have a problem similar to the bug #1599476, my system freezes when I unplug my thunderbolt port if it is connected during startup.

What I have tested so far :
* If the thunderbolt is plugged at startup and I unplug it -> System freeze
* If the thunderbolt is not plugged at startup, I can plug it and unplug it fine.

What I expect to happen :
Being able to unplug my thunderbolt without the system freezing.

I updated my BIOS and the firmware of the dock :
13:47 troche@serenity ~ % sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
1.2.19
12/22/2016

This was working fine in Ubuntu 16.04, and it is not working since my update to Ubuntu 16.10.
13:47 troche@serenity ~ % lsb_release -rd
Description: Ubuntu 16.10
Release: 16.10

My computer is a Dell Precision 5510 laptop with a dock WD15 Thunderbolt.

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: linux-image-4.8.0-41-generic 4.8.0-41.44
ProcVersionSignature: Ubuntu 4.8.0-41.44-generic 4.8.17
Uname: Linux 4.8.0-41-generic x86_64
ApportVersion: 2.20.3-0ubuntu8.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC0D0p: troche 2945 F...m pulseaudio
 /dev/snd/controlC0: troche 2945 F.... pulseaudio
CurrentDesktop: Unity
Date: Thu Mar 30 13:41:26 2017
HibernationDevice: RESUME=UUID=65e0fb0a-8046-4428-bb89-53d36638d70a
InstallationDate: Installed on 2016-08-24 (218 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
MachineType: Dell Inc. Precision 5510
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-41-generic root=UUID=7510dd66-3e56-446f-b39c-71724a228d07 ro quiet splash
RelatedPackageVersions:
 linux-restricted-modules-4.8.0-41-generic N/A
 linux-backports-modules-4.8.0-41-generic N/A
 linux-firmware 1.161.1
SourcePackage: linux
UpgradeStatus: Upgraded to yakkety on 2017-03-27 (3 days ago)
dmi.bios.date: 12/22/2016
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.2.19
dmi.board.name: 0N8J4R
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.2.19:bd12/22/2016:svnDellInc.:pnPrecision5510:pvr:rvnDellInc.:rn0N8J4R:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Precision 5510
dmi.sys.vendor: Dell Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.11 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.11-rc5

[Thibault Roche (thibault-n)]

The bug itself is fixed in the 4.11.0-041100rc5-generic kernel. But I encounter regular freezes with this version of the kernel, and I have ACPI related error messages.

Here are the ACPI messages from the dmesg :
[ 6.090510] ACPI Warning: \_SB.IETM._ART: Return Package type mismatch at index 0 - found Integer, expected Reference (20170119/nspredef-297)
[ 6.090530] ACPI: Invalid package element [0]: got number, expecting [R]
[ 6.090531] _ART package 0 is invalid, ignored
[ 6.090563] ACPI Warning: \_SB.IETM._TRT: Return Package has no elements (empty) (20170119/nsprepkg-130)

[Joseph Salisbury (jsalisbury)]

Thanks for the feedback. Since it's fixed in mainline, we can perform a "Reverse" bisect to identify the commit that fixes the bug.

We first need to know that last bad kernel version and first good kernel version. Can you test the following kernels:

v4.9: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9/
v4.10: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.10/
v4.11-rc1: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.11-rc1/

You don't have to test every kernel, just up until the first kernel that does not have this bug.