[Bug 1933247] Re: cpuset_hotplug from controllers in ubuntu_ltp failed on online/offline on Azure

** Changed in: ubuntu-kernel-tests
Status: In Progress => Fix Released

** Changed in: linux (Ubuntu)
Status: New => Invalid

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https://bugs.launchpad.net/bugs/1933247

Title:
cpuset_hotplug from controllers in ubuntu_ltp failed on online/offline
on Azure

Status in ubuntu-kernel-tests:
Fix Released
Status in linux package in Ubuntu:
Invalid

Bug description:
Hotplugging of CPUs does not work on Azure instances. See lp:1836166
for cpuhotplug tests.

$ sudo ./runltp -f controllers -s cpuset_hotplug

cpuset_hotplug 1 TINFO: CPUs are numbered continuously starting at 0 (0-3)
cpuset_hotplug 1 TINFO: Nodes are numbered continuously starting at 0 (0)
cpuset_hotplug 1 TINFO: /bin/echo: write error: Device or resource busy
cpuset_hotplug 1 TFAIL: CPU#1 failed.
cpuset_hotplug 3 TINFO: /bin/echo: write error: Device or resource busy
cpuset_hotplug 3 TFAIL: setup test environment(offline CPU#1) failed
cpuset_hotplug 5 TINFO: /bin/echo: write error: Device or resource busy
cpuset_hotplug 5 TFAIL: CPU#1 failed.
cpuset_hotplug 7 TINFO: /bin/echo: write error: Device or resource busy
cpuset_hotplug 7 TFAIL: CPU#1 failed.
cpuset_hotplug 9 TINFO: /bin/echo: write error: Device or resource busy
cpuset_hotplug 9 TFAIL: CPU#1 failed.
cpuset_hotplug 11 TINFO: /bin/echo: write error: Device or resource busy
cpuset_hotplug 11 TFAIL: setup test environment(offline CPU#1) failed

Found on: focal/azure 5.8.0-1033-azure (instance Standard_B4Ms),
focal/azure 5.8.0-1034.36 (Standard_D4_v4).

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