** Changed in: linux (Ubuntu)
Status: In Progress => Fix Committed
** Changed in: ubuntu-z-systems
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1772593
Title:
cpum_sf: ensure sample freq is non-zero
Status in Ubuntu on IBM z Systems:
Fix Committed
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Xenial:
Fix Committed
Status in linux source package in Artful:
Fix Committed
Status in linux source package in Bionic:
Fix Committed
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
initialization for the hardware sampling facility.
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.
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