Falkor erratum 1041 needs workaround

Bug #1738497 reported by dann frazier on 2017-12-15
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
High
dann frazier
Zesty
High
dann frazier
Artful
High
dann frazier

Bug Description

[Impact]
A hardware issue can lead to a kernel crash or unexpected behavior.

[Test Case]
The issue presents itself most commonly as a boot-time crash. It doesn't effect all Falkor CPUs, and only rarely occurs on CPUs that are effected.

[Regression Risk]
The fix is entirely in arm64 code, mitigating the risk to other architectures. The biggest regression risk is performance, as the workaround involves adding an instruction barrier prior to disabling the MMU.

dann frazier (dannf) on 2017-12-15
summary: - Falkor erratum 1041 needs wworkaround
+ Falkor erratum 1041 needs workaround

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1738497

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status: New → Incomplete
Changed in linux (Ubuntu Artful):
status: New → Incomplete
Changed in linux (Ubuntu Zesty):
status: New → Incomplete
dann frazier (dannf) on 2017-12-15
Changed in linux (Ubuntu):
status: Incomplete → In Progress
assignee: nobody → dann frazier (dannf)
importance: Undecided → High
Changed in linux (Ubuntu Zesty):
importance: Undecided → High
Changed in linux (Ubuntu Artful):
importance: Undecided → High
Changed in linux (Ubuntu Zesty):
status: Incomplete → In Progress
Changed in linux (Ubuntu Artful):
status: Incomplete → In Progress
Changed in linux (Ubuntu Zesty):
assignee: nobody → dann frazier (dannf)
Changed in linux (Ubuntu Artful):
assignee: nobody → dann frazier (dannf)
Stefan Bader (smb) on 2018-01-24
Changed in linux (Ubuntu Zesty):
status: In Progress → Won't Fix
Changed in linux (Ubuntu Artful):
status: In Progress → 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-artful' to 'verification-done-artful'. If the problem still exists, change the tag 'verification-needed-artful' to 'verification-failed-artful'.

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-artful
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