This bug was fixed in the package linux - 4.15.0-88.88
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linux (4.15.0-88.88) bionic; urgency=medium
* bionic/linux: 4.15.0-88.88 -proposed tracker (LP: #1862824)
* Segmentation fault (kernel oops) with memory-hotplug in
ubuntu_kernel_selftests on Bionic kernel (LP:
Xenial 4.15, Xenial 4.15 Oracle all green.
thank you!
** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
** Changed in: ubuntu-kernel-tests
Status: Fix Committed => Fix Released
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
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You
Bionic 4.15 amd64, ppc64 are good.
Checking Xenial 4.15
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Title:
Segmentation fault (kernel oops) with memory-hotplug in
4.15.0-1060.62 linux-aws ubuntu_kernel_selftests has passed on all instances
4.15.0-1033.36 linux-oracle ubuntu_kernel_selftests has memory_hotplug test has
passed
4.15.0-1052.55 linux-gke ubuntu_kernel_selftests has passed on all instances
** Changed in: ubuntu-kernel-tests
Status: New
awaiting main-kernel for amd64 and ppc64
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Title:
Segmentation fault (kernel oops) with memory-hotplug in
ubuntu_kernel_selftests on Bionic
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag
** Changed in: linux (Ubuntu Bionic)
Status: New => Fix Committed
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Title:
Segmentation fault (kernel oops) with memory-hotplug in
Fix for the issue: https://lists.ubuntu.com/archives/kernel-
team/2020-February/107398.html
Tested on AWS with positive test results.
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Title:
Hi Marcelo,
as it's much more easier to reproduce this on clouds (for now), so I just built
a bionic AWS kernel with that commit reverted:
https://people.canonical.com/~phlin/kernel/lp-1862312-memhp/
The memory hotplug test works fine with multiple retries with this
kernel. But if I switched to
Issue NOT spotted on 4.15 GKE (4.15.0-1051.54), X-4.15 GCP
(4.15.0-1053.57)
Spotted on B-4.15 AWS (4.15.0-1059.61) with instance r5.large
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Title:
Thanks! I will try, but this issue was not spotted in our general kernel
testing with the node we use (node rizzo). Thus it might take some time
to find out an affected node first.
You can run this with the source tree:
$ make -C tools/testing/selftests TARGETS=memory-hotplug run_tests
Ref:
Hi, Sam.
Can you help me testing the change above? I uploaded a test kernel with
this change to https://kernel.ubuntu.com/~mhcerri/lp1862312/
It's not clear to me what's the requirement to run the memory hotplug
self test.
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A possible cause might be the Bionic commit 483735440add
(mm/memory_hotplug: fix online/offline_pages called w.o.
mem_hotplug_lock) that was backported from the upstream commit
381eab4a6ee8.
It seems the location of the new call to mem_hotplug_being() was
shifted:
-->8--
diff --git
Issue found on 4.15.0-1059.61~16.04.1 AWS as well.
It's not failing on all of the instances.
** Tags added: aws oracle
** Also affects: ubuntu-kernel-tests
Importance: Undecided
Status: New
** Tags added: ubuntu-kernel-selftests
** Tags added: sru-20200127
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