Comment 11 for bug 1777338

Thanks!

I have tested this kernel; it doesn't work, so the problem is between
fc8704280f2ada9f61f08a2d5adc0dab169cc207 and
8eca6add0defde203282476d7969a7c13bbd7d91.

I've gotten set up with a kernel build environment; I think I can
finish the git bisect myself, but looking at the commits in that
range, I have no hope of actually fixing the underlying bug myself.
I'm building 3f6a3b035f91a22c0d3bd27630bf61eac9c8cf6c now.

On Tue, Jul 17, 2018 at 11:24 AM, Joseph Salisbury
<email address hidden> wrote:
> I built the next test kernel, up to the following commit:
> fc8704280f2ada9f61f08a2d5adc0dab169cc207
>
> The test kernel can be downloaded from:
> http://kernel.ubuntu.com/~jsalisbury/lp1777338
>
> Can you test that kernel and report back if it has the bug or not? I
> will build the next test kernel based on your test results.
>
> Thanks in advance
>
>
> MD5SUM of files:
> d76993d34e1203375090a47c4de8ebfe linux-image-unsigned-4.15.0-23-generic_4.15.0-23.26~lp1777338Commitfc8704280f_amd64.deb
>
> 5b89b2341b858bbe2bcae88e3efaf8c8 linux-
> modules-4.15.0-23-generic_4.15.0-23.26~lp1777338Commitfc8704280f_amd64.deb
>
> 6928b4ad5f2a861ad674ff88a4745471 linux-modules-
> extra-4.15.0-23-generic_4.15.0-23.26~lp1777338Commitfc8704280f_amd64.deb
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> 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:
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