Executed the test case with -proposed Bionic kernel. No system hang or crash was observed. On Cavium CN99XX Thunder X2 system.
** Tags removed: verification-needed-bionic ** Tags added: verification-done-bionic -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1797200 Title: [Bionic] ACPI / PPTT: use ACPI ID whenever ACPI_PPTT_ACPI_PROCESSOR_ID_VALID is set Status in linux package in Ubuntu: Invalid Status in linux source package in Bionic: Fix Committed Bug description: [Impact] Currently, we use the ACPI processor ID only for the leaf/processor nodes as the specification states it must match the value of the ACPI processor ID field in the processor’s entry in the MADT. However, if a PPTT structure represents a processors group, it matches a processor container UID in the namespace and the ACPI_PPTT_ACPI_PROCESSOR_ID_VALID flag indicates whether the ACPI processor ID is valid. Let's use UID whenever ACPI_PPTT_ACPI_PROCESSOR_ID_VALID is set to be consistent instead of using table offset as it's currently done for non-leaf nodes. Fixes: 2bd00bcd73e5 (ACPI/PPTT: Add Processor Properties Topology Table parsing) [Fix] This patch in is 4.18: 30998033f62a ACPI / PPTT: use ACPI ID whenever ACPI_PPTT_ACPI_PROCESSOR_ID_VALID is set [Test] -- testcase -- #!/bin/bash stress-ng -q --vm 100 --vm-bytes 1G --cpu 210 --timeout 2400s --metrics-brief & pid=$! for i in {1..210}; do num=$((RANDOM%10+$i)) echo "Offline CPU $num" echo 0 > /sys/devices/system/cpu/cpu$num/online || exit 1 sleep 3s echo "Online CPU $num" echo 1 > /sys/devices/system/cpu/cpu$num/online || exit 1 done kill -9 $pid ---------------- Executed the test case with stock Bionic kernel and with Bionic kernel with patches applied. No system hang or crash was observed. On Cavium CN99XX Thunder X2 system. [Regression Potential] Regression tested on Cavium Thunder X2 CN99XX system, and none were found. Regression risk is low. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1797200/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
