CPUs stall

[Joe Wood]

Frequently on boot system freezes. Investigation reveals both CPUs stall. Full log attached.

It’s a pretty old laptop, but all else seems to work.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1784585

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Joe Wood (joew60)]

Log file is a text file, great fight with linux and iPad to get this far:(

[Joseph Salisbury (jsalisbury)]

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.18 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.18-rc7

[Joe Wood (joew60)]

Hi,

Firstly, this problem has been ongoing since I dug my old laptop back to life, say January 2018. I put a new SSD in before installing Ubuntu 17-10 plus updates. I later updated to 18-04, all at current latest official releases.

I’m copying the full syslog output, since systems/journal failed.

I’ve also am copying the last run dmesg log as the kernel reported two problems:
(A) CPU stalled at around 40 seconds.
(B) Page protection error W+X.

I’ve removed the mainline kernel and reverted to current Ubuntu release.

Hope that helps.

[Kai-Heng Feng (kaihengfeng)]

Looks like it's i386 instead of AMD64?

Please try linux-next [1] since there are some new PTI fixes.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/

[Joe Wood (joew60)]

Hi,

I have not forgotten your request to try linux-next. I’ve built the new kernel.

Please be advised that I copied the current kernel config file from /boot into the build directory. Upon running make, there where a significant number of new options. I choose to let them all go through on their default setting.

I’m hoping to try the new kernel this weekend, but I need to backup my system first. My laptop only has usb 1.1 so this maybe slow.

You are quite correct I’m running in i386 mode. I’ve got a 64bit Ubuntu image, 18-04, on a usb drive. It would be interesting to see how booting a live Ubuntu worked.

For various reasons I’m keen to install the x64 and forget about the i386. But I’ll definitely try the new i386 build first.

Any comments/suggestions are welcome.

[Joe Wood (joew60)]

Hi,

I tried booting a x64 xubuntu image, from a usb drive, not installed. Stock xubuntu.

CPU stalls, dmesg and syslog attached.

[Kai-Heng Feng (kaihengfeng)]

Sorry for the late reply. Does this also happen to Disco (19.04) daily image?