------- Comment From heinz-werner_se...@de.ibm.com 2018-10-31 10:40 EDT-------
After checking , please provide the Fix for Xenial, Bionic and Cosmic.

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https://bugs.launchpad.net/bugs/1800849

Title:
  [Ubuntu] kvm: fix deadlock when killed by oom

Status in Ubuntu on IBM z Systems:
  Triaged
Status in linux package in Ubuntu:
  New

Bug description:
  Description:  kvm: fix deadlock when killed by oom

  Symptom:      oom killer leaves processes in a deadlock state.

  Problem:      The problem arises in the rare cases in which
                    handle_mm_fault does not release the mm_sem.

  Solution:     Correct the issue by manually relaese the mm_sem
                    when needed.

  Reproduction: Create numerous KVM guests so that the host starts
                    swapping and memory becomes overcomitted and the oom
                    killer is triggered.

  
  kernel 4.19
  Upstream-ID:  306d6c49ac9ded11114cb53b0925da52f2c2ada1

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