Fix system reboot when disconnecting WiFi

Bug #1899726 reported by Kai-Heng Feng on 2020-10-14
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
HWE Next
Undecided
Unassigned
linux (Ubuntu)
Status tracked in Groovy
Focal
High
Unassigned
Groovy
High
Unassigned
linux-oem-5.6 (Ubuntu)
Status tracked in Groovy
Focal
High
Unassigned
Groovy
Undecided
Unassigned

Bug Description

[Impact]
Hardware triggrs reboot when disconnecting WiFi connection.

[Fix]
There's a DMA bug in Intel WiFi 9000 needs to be limits to 6 RX queue
max.

[Test]
With the patch applied, a 1000 times of connect/disconnect loop doesn't
bring the system down.

[Regression Potential]
Not that I can think of. Hypothetically reducing RX queue rings will
reduce the RX speed, but the wireless transfter is a lot slower then DMA
operation, so we won't see any difference.

Changed in linux (Ubuntu Focal):
status: New → Confirmed
Changed in linux (Ubuntu Groovy):
status: New → Confirmed
Changed in linux-oem-5.6 (Ubuntu Focal):
status: New → Confirmed
Changed in linux-oem-5.6 (Ubuntu Groovy):
status: New → Invalid
Changed in linux (Ubuntu Focal):
importance: Undecided → High
Changed in linux (Ubuntu Groovy):
importance: Undecided → High
Changed in linux-oem-5.6 (Ubuntu Focal):
importance: Undecided → High
tags: added: oem-priority originate-from-1891986 sutton
Timo Aaltonen (tjaalton) on 2020-10-16
Changed in linux-oem-5.6 (Ubuntu Focal):
status: Confirmed → Fix Committed

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: verification-needed-focal
jeremyszu (os369510) wrote :

I'd verified this issue using -1032 kernel from -proposed on P620 with Intel 9260.

tags: added: verification-done-focal
removed: verification-needed-focal
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package linux - 5.8.0-25.26

---------------
linux (5.8.0-25.26) groovy; urgency=medium

  * groovy/linux: 5.8.0-25.26 -proposed tracker (LP: #1899940)

  * CVE-2020-12351
    - Bluetooth: L2CAP: Fix calling sk_filter on non-socket based channel

  * CVE-2020-12352
    - Bluetooth: A2MP: Fix not initializing all members

  * CVE-2020-12351 // CVE-2020-12352 // CVE-2020-24490
    - Bluetooth: Disable High Speed by default
    - Bluetooth: MGMT: Fix not checking if BT_HS is enabled
    - [Config] Disable BlueZ highspeed support

  * ec2-hibinit-agent needs to properly initialize swap file (LP: #1892728)
    - ext4: implement swap_activate aops using iomap

 -- Andrea Righi <email address hidden> Thu, 15 Oct 2020 12:09:24 +0200

Changed in linux (Ubuntu Groovy):
status: Confirmed → Fix Released
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