Is there a kernel trace in the logs from the hang? I'd like to see if this is related to bug 1733662, which has a test kernel here if you want to try it:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1733662/comments/62 ** Changed in: linux (Ubuntu) Status: Confirmed => Triaged ** Also affects: linux (Ubuntu Artful) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Artful) Status: New => Triaged ** Changed in: linux (Ubuntu Artful) Importance: Undecided => High ** Changed in: linux (Ubuntu) Importance: Undecided => High ** Tags added: kernel-da-key ** Also affects: linux (Ubuntu Bionic) Importance: High Status: Triaged -- 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/1744163 Title: CPU offlining can trigger hangs with HP ProLiant DL360p Gen8. Status in linux package in Ubuntu: Triaged Status in linux source package in Artful: Triaged Status in linux source package in Bionic: Triaged Bug description: CPU offlining can trigger hangs with HP ProLiant DL360p Gen8 on Ubuntu 17.10. The hangs also occur with latest mainline kernel Linux 4.15-rc8. I bisected the upstream mainline kernel. This is a regression introduced by Linux 4.13-rc1 commit c5cb83bb337c25caae995d992d1cdf9b317f83de ("genirq/cpuhotplug: Handle managed IRQs on CPU hotplug"). https://github.com/torvalds/linux/commit/c5cb83bb337c25caae995d992d1cdf9b317f83de This test case to offline all CPUs except for CPU 0 can be used to trigger a hang. for i in $(seq 1 $(expr $(nproc --all) - 1)); do sudo sh -c "echo 0 > /sys/devices/system/cpu/cpu$i/online"; done To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1744163/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
