SRU request submitted:
https://lists.ubuntu.com/archives/kernel-team/2018-May/092737.html
** No longer affects: linux (Ubuntu Cosmic)
** Description changed:
- Description: cpum_sf: ensure sample freq is non-zero
- Symptom: A kernel crash might occur.
- Problem: An FP divide exception during the sample rate
+ == 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
+ Solution: Ensure that the sample frequency of the perf
event attribute is non-zero.
- Reproduction: Run trinity against the perf_event_open() syscall.
- Upstream-ID: 4bbaf2584b86b0772413edeac22ff448f36351b1
- Component: kernel
+
+ == 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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https://bugs.launchpad.net/bugs/1772593
Title:
cpum_sf: ensure sample freq is non-zero
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