Ran the tests against the i386 -proposed kernel, cannot reproduce the issue with the fixed kernel. Also ran the ADT tests and could not reproduce the issue (and these run the memory hotplug tests too).
Tested, and verified. ** Tags removed: verification-needed-artful ** Tags added: verification-done-artful -- 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/1747069 Title: artful 4.13 i386 kernels crash after memory hotplug remove Status in linux package in Ubuntu: In Progress Bug description: == SRU Request, Artful == Hotplug removal causes i386 crashes when exercised with the kernel selftest mem-on-off-test script. == Fix == Revert commit f1dd2cd13c4b (""mm, memory_hotplug: do not associate hotadded memory to zones until online") Note: A fix occurs in 4.15 however this requires a large set of changes that are way too large to be SRU'able and the least risky way forward is to revert the offending commit. == Testcase == Running the kernel selftest script mem-on-off-test.sh, followed by a sync, followed by re-installing kernel packages will always trigger this issue. Simply running the mem-on-off-test.sh script sometimes won't trigger the problem. I believe this is why we've not seen this happen too frequently with our ADT tests. I can reproduce this in a VM with 4 CPUs and 2GB of memory. == Regression Potential == Reverting this commit does remove some functionality, however this does not regress the kernel compared to previous releases and having a working reliable memory hotplug is the preferred option. This fix does touch some memory hotplug, so there is a risk that this may break this functionality that is not covered by the kernel regression testing. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1747069/+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
