Public bug reported:
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
** Affects: ubuntu-z-systems
Importance: High
Assignee: Canonical Kernel Team (canonical-kernel-team)
Status: Triaged
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-172752 severity-high
targetmilestone-inin1810
** Tags added: architecture-s39064 bugnameltc-172752 severity-high
targetmilestone-inin1810
** Changed in: ubuntu
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Package changed: ubuntu => linux (Ubuntu)
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https://bugs.launchpad.net/bugs/1800849
Title:
[Ubuntu] kvm: fix deadlock when killed by oom
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