I've tried upgrading to the latest development kernel, from http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc1/, and re- testing. The details of the problem have changed (but they were never 100% consistent), but the problem definitely still exists. I'm attaching dmesg output from three runs:
* run1.txt -- In this run, the cpu_offlining script successfully shut down all CPU nodes (except node 0, of course), but when bringing them up again, the system segfaulted after bringing up several nodes. Thereafter, any remotely substantive command (top or shutdown, for instance) hung, although bash remained responsive and I could take file listings with ls. * run2.txt -- In this run, the cpu_offlining script segfaulted when taking CPU nodes offline. The system then became unreliable in the same way as with run 1. * run3.txt -- In this run, the script seemed to complete successfully, but the dmesg output includes errors associated with bringing up several nodes. The system SEEMED TO operate normally thereafter, but my testing was limited. ** Attachment added: "dmesg output from three runs with the 4.15.0-041500rc1 kernel" https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1733662/+attachment/5017191/+files/boldore.tgz -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1733662 Title: System hang with Linux kernel 4.13, not with 4.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1733662/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
