OK, I grabbed commit 74899d92e66663dc7671a8017b3146dcd4735f3b "x86/xen: Add call of speculative_store_bypass_ht_init() to PV paths" from g...@github.com:torvalds/linux.git and cherry-picked it on top of the tag Ubuntu-4.15.0-29.31, and built the kernel, and now it boots fine as dom0! I think that that patch fixes this bug.
How can I get this commit to be pulled into the main Ubuntu kernel development branch, to be released in the official kernel builds? -- 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/1777338 Title: Linux 4.15.0-23 crashes during the boot process with a "Unable to handle kernel NULL pointer dereference" message Status in linux package in Ubuntu: In Progress Status in linux source package in Bionic: In Progress Bug description: I went to boot my computer today and it wouldn't boot. I get an "Unable to handle kernel NULL pointer dereference" message during the boot process, and, a bit after that, a message from the kernel watchdog about CPU #0 being stuck. Then the boot process stops completely. I was able to boot the system by telling Grub to load 4.15.0-22, which works perfectly fine, so there has been a regression. I am running Ubuntu as a Xen dom0, if that matters. I haven't tried booting the offending kernel version without Xen. I'm not sure where, if anywhere, these messages go on disk, for posting. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-23-generic 4.15.0-23.25 ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17 Uname: Linux 4.15.0-22-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.9-0ubuntu7.1 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Sun Jun 17 10:12:58 2018 InstallationDate: Installed on 2017-08-06 (314 days ago) InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: linux-signed UpgradeStatus: Upgraded to bionic on 2018-05-29 (19 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1777338/+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
