iwlwifi microcode error detected using hostapd with Intel 3168 in a NUC6CAYH

[Daniel Montgomery]

I found a similar, fixed, bug with another Intel chip. I believe the upstream fix from Intel addressed my 3168, but it looks like the fix released in linux-firmware only addresses the 8265.

https://bugs.launchpad.net/ubuntu/+bug/1808389

I only see this occur in AP mode, and not in managed mode (i.e., hostapd triggers it, but wpa_supplicant does not). The following repeats a couple times a second indefinitely:

/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.817625] iwlwifi 0000:02:00.0: Microcode SW error detected. Restarting 0x2000000.
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.818642] iwlwifi 0000:02:00.0: Start IWL Error Log Dump:
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.819698] iwlwifi 0000:02:00.0: Status: 0x00000100, count: 6
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.821046] iwlwifi 0000:02:00.0: Loaded firmware version: 27.541033.0
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.822370] iwlwifi 0000:02:00.0: 0x00003068 | ADVANCED_SYSASSERT
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.823725] iwlwifi 0000:02:00.0: 0x00000230 | trm_hw_status0
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.825086] iwlwifi 0000:02:00.0: 0x00000000 | trm_hw_status1
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.826426] iwlwifi 0000:02:00.0: 0x00043D2C | branchlink2
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.827790] iwlwifi 0000:02:00.0: 0x0004AEDE | interruptlink1
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.828751] iwlwifi 0000:02:00.0: 0x00000000 | interruptlink2
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.829679] iwlwifi 0000:02:00.0: 0x00000064 | data1
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.830606] iwlwifi 0000:02:00.0: 0x00000032 | data2
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.831523] iwlwifi 0000:02:00.0: 0x000000FF | data3
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.832442] iwlwifi 0000:02:00.0: 0x00000000 | beacon time
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.833355] iwlwifi 0000:02:00.0: 0x0002920C | tsf low
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.834266] iwlwifi 0000:02:00.0: 0x00000000 | tsf hi
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.835177] iwlwifi 0000:02:00.0: 0x00000000 | time gp1
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.836098] iwlwifi 0000:02:00.0: 0x0002920C | time gp2
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.837013] iwlwifi 0000:02:00.0: 0x00000001 | uCode revision type
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.837939] iwlwifi 0000:02:00.0: 0x0000001B | uCode version major
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.838864] iwlwifi 0000:02:00.0: 0x00084169 | uCode version minor
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.839792] iwlwifi 0000:02:00.0: 0x00000220 | hw version
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.840715] iwlwifi 0000:02:00.0: 0x00C89200 | board version
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.841660] iwlwifi 0000:02:00.0: 0x0028011C | hcmd
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.842605] iwlwifi 0000:02:00.0: 0x24022000 | isr0
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.843545] iwlwifi 0000:02:00.0: 0x01000000 | isr1
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.844498] iwlwifi 0000:02:00.0: 0x00000002 | isr2
/var/log/syslog.5.gz:Apr 18 15:59:54 pinot kernel: [137784.845435] iwlwifi 0000:02:00.0: 0x4041FCC0 | isr3

lshw output:

           *-network
                description: Wireless interface
                product: Dual Band Wireless-AC 3168NGW [Stone Peak]
                vendor: Intel Corporation
                physical id: 0
                bus info: pci@0000:02:00.0
                logical name: wlp2s0
                version: 10
                serial: a0:a4:c5:7a:8f:64
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
                configuration: broadcast=yes driver=iwlwifi driverversion=4.15.0-47-generic firmware=27.541033.0 ip=192.168.1.37 latency=0 link=yes multicast=yes wireless=IEEE 802.11
                resources: irq:131 memory:91200000-91201fff

top of output from 'iw list':

Wiphy phy0
        max # scan SSIDs: 20
        max scan IEs length: 425 bytes
        max # sched scan SSIDs: 20
        max # match sets: 11
        max # scan plans: 2
        max scan plan interval: 65535
        max scan plan iterations: 254
        Retry short limit: 7
        Retry long limit: 4
        Coverage class: 0 (up to 0m)
        Device supports RSN-IBSS.
        Device supports AP-side u-APSD.
        Device supports T-DLS.
        Supported Ciphers:
                * WEP40 (00-0f-ac:1)
                * WEP104 (00-0f-ac:5)
                * TKIP (00-0f-ac:2)
                * CCMP-128 (00-0f-ac:4)
                * CMAC (00-0f-ac:6)
        Available Antennas: TX 0 RX 0
        Supported interface modes:
                 * IBSS
                 * managed
                 * AP
                 * AP/VLAN
                 * monitor
                 * P2P-client
                 * P2P-GO
                 * P2P-device

output from 'lsb_release -rd':
Description: Ubuntu 18.04.2 LTS
Release: 18.04

> apt-cache policy linux-firmware
linux-firmware:
  Installed: 1.173.3
  Candidate: 1.173.3
  Version table:
 *** 1.173.3 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu bionic-security/main amd64 Packages
        100 /var/lib/dpkg/status
     1.173 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-firmware 1.173.3
ProcVersionSignature: Ubuntu 4.15.0-47.50-generic 4.15.18
Uname: Linux 4.15.0-47-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
Date: Tue Apr 23 13:25:29 2019
Dependencies:

PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-firmware
UpgradeStatus: No upgrade log present (probably fresh install)

[Emmanuel Grumbach (egrumbach)]

You can open a bug on intel.

Check this link to see how:

https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi/debugging

[Seth Forshee (sforshee)]

Have you already tested newer firmware to see if it fixes the issue? The latest firmware can be downloaded from here:

https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/iwlwifi-3168-29.ucode

Then you need to place the file in /lib/firmware. I recommend you keep a backup of the old file:

# mv /lib/firmware/iwlwifi-3168-29.ucode /lib/firmware/iwlwifi-3168-29.ucode.orig
# mv iwlwifi-3168-29.ucode /lib/firmware

Then reboot to start using the new firmware. Let me know if that fixes the issue. If not, I suggest you follow up filing a bug as Emmanuel suggested as only Intel can help you resolve this issue.

[Daniel Montgomery (danopato)]

I tried the update from git.kernel.org, but no luck. Still getting microcode errors.

I'll file a bug with Intel as well, thanks.

[Stefan Söffing (soeffing)]

I experienced this bug as well after update to Ubuntu 19.04.

Tried newest firmware -29 (and also -27, -22) which does not work either. Tried to go back to -21, but this seems to be no longer supported by the driver.

What seems to help for me is to set bt_coex_active=0, maybe you want to try that as well.

If you file a bug on kernel.org, please post a link over here for reference. Thanks!

Stefan

[Daniel Montgomery (danopato)]

Thanks for the suggestion, Stefan. I just tried setting bt_coex_active to 0 (and confirmed it took by checking /sys/module/iwlwifi/parameters/bt_coex_active). Unfortunately I still get the errors.

I also tried back-rev firmware earlier with no luck.

[Emmanuel Grumbach (egrumbach)]

Stefan, please file a bug on Intel. You shouldn't have to disable bt coex.

https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi/debugging

[Launchpad Janitor (janitor)]

[Expired for linux-firmware (Ubuntu) because there has been no activity for 60 days.]