[Bug 1874005] Re: QEMU pegs CPU at 100% when running a Focal guest image
** Changed in: linux (Ubuntu Bionic) Status: In Progress => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1874005 Title: QEMU pegs CPU at 100% when running a Focal guest image To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1874005/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1874005] Re: QEMU pegs CPU at 100% when running a Focal guest image
** Changed in: linux (Ubuntu Bionic) Status: Confirmed => In Progress ** Changed in: linux (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1874005 Title: QEMU pegs CPU at 100% when running a Focal guest image To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1874005/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1874005] Re: QEMU pegs CPU at 100% when running a Focal guest image
** Description changed:
+ [Impact]
+
+ Running a VM with a guest kernel >=5.2 results in the QEMU process
+ pegging the CPU at 100%. Sometimes it recovers but most of the times the
+ QEMU process just hangs, libvirt times out trying to talk to it and it
+ can't be killed.
+
+ [Test Case]
+
+ Spin up a libvirt VM that runs a kernel >=5.2. Sometimes it takes a
+ couple of VM reboots but the QEMU process will eventually hang with 100%
+ CPU utilization.
+
+ [Fix]
+
+ Cherry pick commit 53a712bae5dd ("powerpc/powernv/idle: Restore
+ AMR/UAMOR/AMOR after idle").
+
+ [Regression Potential]
+
+ Moderate. The commit is in 5.2 and is a clean cherry-pick but it's POWER
+ assembly voodoo.
+
+ [Original Description]
+
Running a Focal guest image with a 5.4 kernel on a POWER9 Bionic host
with kernel 4.15 leads to the QEMU process pegging the CPU at 100%.
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https://bugs.launchpad.net/bugs/1874005
Title:
QEMU pegs CPU at 100% when running a Focal guest image
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[Bug 1874005] Re: QEMU pegs CPU at 100% when running a Focal guest image
** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1874005 Title: QEMU pegs CPU at 100% when running a Focal guest image To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1874005/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
