After upgrading Ubuntu 16.04.5 LTS from linux 4.4.0-140 to 4.4.0-141 I noticed that when issuing larger (several GB) downloads over the WiFi the wireless network hangs and cannot be brought to live again (e. g. with systemctl restart networking). Rebooting (with and without powering off) helps, but the problem reappears as soon as you start downloading within minutes.
So I fear there might be a problem with the latest changes in ath10k_pci. When booting 4.4.0-140 again (which is still available from the boot-menu) the problem does not appear. Booting 4.4.0.141 again let's the problem re-appear. Between boots I powered off the notebook (Dell XPS13).
Please be kind . this is my first bug report. If I did something wrong or leave something out please tell me, I'll try to get better.
In parallel I see messages in syslog like this:
Jan 8 11:32:39 ubuntu kernel: [ 8719.011791] ath10k_pci 0000:3a:00.0: failed to receive scan abortion completion: timed out
Jan 8 11:32:39 ubuntu kernel: [ 8719.011805] ath10k_pci 0000:3a:00.0: failed to stop scan: -110
Jan 8 11:32:39 ubuntu kernel: [ 8719.011812] ath10k_pci 0000:3a:00.0: failed to start hw scan: -110
Jan 8 11:32:39 ubuntu wpa_supplicant[2317]: wlp58s0: CTRL-EVENT-SCAN-FAILED ret=-110 retry=1
Jan 8 11:32:43 ubuntu wpa_supplicant[2317]: wlp58s0: CTRL-EVENT-SCAN-FAILED ret=-11 retry=1
Jan 8 11:32:43 ubuntu kernel: [ 8723.011899] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:32:47 ubuntu kernel: [ 8727.011988] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:32:51 ubuntu kernel: [ 8731.012052] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:32:55 ubuntu kernel: [ 8735.012256] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:32:59 ubuntu kernel: [ 8739.012328] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:33:03 ubuntu kernel: [ 8743.012433] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:33:07 ubuntu kernel: [ 8747.012702] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:33:11 ubuntu kernel: [ 8751.012744] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:33:15 ubuntu kernel: [ 8755.012917] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:33:19 ubuntu kernel: [ 8759.013002] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:33:23 ubuntu kernel: [ 8763.013066] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:33:27 ubuntu kernel: [ 8767.013085] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:33:31 ubuntu kernel: [ 8771.013103] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:33:35 ubuntu kernel: [ 8775.013401] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:33:39 ubuntu kernel: [ 8779.013286] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:33:43 ubuntu kernel: [ 8783.013625] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:33:43 ubuntu wpa_supplicant[2317]: message repeated 15 times: [ wlp58s0: CTRL-EVENT-SCAN-FAILED ret=-11 retry=1]
Jan 8 11:33:46 ubuntu gnome-session[2834]: Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
Jan 8 11:33:47 ubuntu wpa_supplicant[2317]: wlp58s0: CTRL-EVENT-SCAN-FAILED ret=-11 retry=1
Jan 8 11:33:47 ubuntu kernel: [ 8787.013715] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:33:51 ubuntu kernel: [ 8791.013592] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:33:55 ubuntu kernel: [ 8795.013699] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:33:55 ubuntu wpa_supplicant[2317]: message repeated 2 times: [ wlp58s0: CTRL-EVENT-SCAN-FAILED ret=-11 retry=1]
Jan 8 11:33:59 ubuntu wpa_supplicant[2317]: wlp58s0: CTRL-EVENT-SCAN-FAILED ret=-11 retry=1
Jan 8 11:33:59 ubuntu kernel: [ 8799.014036] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:34:03 ubuntu wpa_supplicant[2317]: wlp58s0: CTRL-EVENT-SCAN-FAILED ret=-11 retry=1
Jan 8 11:34:03 ubuntu kernel: [ 8803.014115] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:34:07 ubuntu wpa_supplicant[2317]: wlp58s0: CTRL-EVENT-SCAN-FAILED ret=-11 retry=1
Jan 8 11:34:07 ubuntu kernel: [ 8807.014142] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:34:11 ubuntu wpa_supplicant[2317]: wlp58s0: CTRL-EVENT-SCAN-FAILED ret=-11 retry=1
Jan 8 11:34:11 ubuntu kernel: [ 8811.014251] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
Jan 8 11:34:15 ubuntu kernel: [ 8815.014233] ath10k_pci 0000:3a:00.0: failed to start hw scan: -11
a.s.o.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-141-generic 4.4.0-141.167
ProcVersionSignature: Ubuntu 4.4.0-141.167-generic 4.4.162
Uname: Linux 4.4.0-141-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: user 2640 F.... pulseaudio
Date: Tue Jan 8 12:22:14 2019
DistributionChannelDescriptor:
# This is a distribution channel descriptor
# For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
canonical-oem-somerville-xenial-amd64-20160624-2
HibernationDevice: RESUME=UUID=1e7a5fa6-d02c-4fe7-94d4-65cc391a1f19
InstallationDate: Installed on 2017-10-25 (439 days ago)
InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 0c45:670c Microdia
Bus 001 Device 003: ID 0cf3:e300 Atheros Communications, Inc.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. XPS 13 9360
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-141-generic.efi.signed root=/dev/mapper/vg00-rootC ro quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-4.4.0-141-generic N/A
linux-backports-modules-4.4.0-141-generic N/A
linux-firmware 1.157.21
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/12/2017
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.5.0
dmi.board.name: 0PF86Y
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr2.5.0:bd12/12/2017:svnDellInc.:pnXPS139360:pvr:rvnDellInc.:rn0PF86Y:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: XPS 13 9360
dmi.sys.vendor: Dell Inc.
Sorry, the logs do probably not contain the errors, since I actually rebooted from 4.4.0-140 (to which I previously rebooted to have the WiFi working) to 4.4.0-141 to submit the bug-report with ubuntu-bug (to have all versions correct).