cpum_sf: ensure sample freq is non-zero
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Ubuntu on IBM z Systems |
Fix Released
|
High
|
Canonical Kernel Team | ||
linux (Ubuntu) |
Fix Released
|
High
|
Unassigned | ||
Xenial |
Fix Released
|
High
|
Unassigned | ||
Artful |
Fix Released
|
High
|
Unassigned | ||
Bionic |
Fix Released
|
High
|
Unassigned |
Bug Description
== SRU Justification ==
A regression was introduced by commit 8c069ff4bd606 in v3.14-rc1. IBM
is requested commit 4bbaf2584b86 in all Ubuntu kernels to resolve this
isue.
Bug Description: cpum_sf: ensure sample freq is non-zero
Symptom: A kernel crash might occur.
Problem: An FP divide exception during the sample rate
Solution: Ensure that the sample frequency of the perf
event attribute is non-zero.
== Fix ==
4bbaf2584b86 ("s390/cpum_sf: ensure sample frequency of perf event attributes is non-zero")
== Regression Potential ==
Low. Fix is specific to s390.
== Test Case ==
A test kernel was built with this patch and tested by the original bug reporter.
The bug reporter states the test kernel resolved the bug.
tags: | added: architecture-s39064 bugnameltc-168084 severity-high targetmilestone-inin16041 |
Changed in ubuntu: | |
assignee: | nobody → Skipper Bug Screeners (skipper-screen-team) |
affects: | ubuntu → linux (Ubuntu) |
Changed in ubuntu-z-systems: | |
assignee: | nobody → Canonical Kernel Team (canonical-kernel-team) |
importance: | Undecided → High |
Changed in linux (Ubuntu): | |
status: | New → Triaged |
importance: | Undecided → High |
Changed in linux (Ubuntu Bionic): | |
status: | New → Triaged |
Changed in linux (Ubuntu Artful): | |
status: | New → Triaged |
Changed in linux (Ubuntu Xenial): | |
status: | New → Triaged |
Changed in linux (Ubuntu Bionic): | |
importance: | Undecided → High |
Changed in linux (Ubuntu Artful): | |
importance: | Undecided → High |
Changed in linux (Ubuntu Xenial): | |
importance: | Undecided → High |
Changed in linux (Ubuntu Cosmic): | |
assignee: | Skipper Bug Screeners (skipper-screen-team) → Joseph Salisbury (jsalisbury) |
Changed in linux (Ubuntu Bionic): | |
assignee: | nobody → Joseph Salisbury (jsalisbury) |
Changed in linux (Ubuntu Artful): | |
assignee: | nobody → Joseph Salisbury (jsalisbury) |
Changed in linux (Ubuntu Xenial): | |
assignee: | nobody → Joseph Salisbury (jsalisbury) |
Changed in linux (Ubuntu Cosmic): | |
status: | Triaged → In Progress |
Changed in linux (Ubuntu Bionic): | |
status: | Triaged → In Progress |
Changed in linux (Ubuntu Artful): | |
status: | Triaged → In Progress |
Changed in linux (Ubuntu Xenial): | |
status: | Triaged → In Progress |
Changed in ubuntu-z-systems: | |
status: | New → In Progress |
Changed in linux (Ubuntu Xenial): | |
status: | In Progress → Fix Committed |
Changed in linux (Ubuntu Artful): | |
status: | In Progress → Fix Committed |
Changed in linux (Ubuntu Bionic): | |
status: | In Progress → Fix Committed |
Changed in linux (Ubuntu): | |
status: | In Progress → Fix Committed |
Changed in ubuntu-z-systems: | |
status: | In Progress → Fix Committed |
tags: |
added: verification-done-artful removed: verification-needed-artful |
Changed in linux (Ubuntu): | |
status: | Fix Committed → Fix Released |
Changed in ubuntu-z-systems: | |
status: | Fix Committed → Fix Released |
I built Xenial, Artful and Bionic test kernels with commit 4bbaf2584b86b07 72413edeac22ff4 48f36351b1.
The test kernel can be downloaded from: kernel. ubuntu. com/~jsalisbury /lp1772593
http://
Can you test this kernel and see if it resolves this bug?
Note about installing test kernels: unsigned .deb packages.
• If the test kernel is prior to 4.15(Bionic) you need to install the linux-image and linux-image-extra .deb packages.
• If the test kernel is 4.15(Bionic) or newer, you need to install the linux-modules, linux-modules-extra and linux-image-
Thanks in advance!