group.of.nepali.translators team mailing list archive

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

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

Status in Ubuntu on IBM z Systems:
  In Progress
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Artful:
  In Progress
Status in linux source package in Bionic:
  In Progress

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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