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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Xenial and Cosmic already have commit 306d6c49ac9 via upstream stable
updates.

I built a Bionic test kernel with commit 306d6c49ac9.  The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1800849

Can you test this kernel and see if it resolves this bug?

Note about installing test kernels:
• 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-unsigned .deb packages.

Thanks in advance!


** Changed in: linux (Ubuntu Xenial)
       Status: Triaged => Fix Released

** Changed in: linux (Ubuntu Bionic)
       Status: Triaged => In Progress

** Changed in: linux (Ubuntu)
       Status: Triaged => Fix Released

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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:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Bionic:
  In Progress
Status in linux source package in Cosmic:
  Fix Released

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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