[MacBookPro11,1] Utopic freezes on boot

[Jussi Pakkanen]

Running latest utopic on Macbook Pro Retina causes it to freeze on boot. I can't file this with ubuntu-bug because the system is not bootable, but the hardware information can be read from bug 1317862.

Attached is a screenshot of where it freezes when booted in recovery mode.

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1322148

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.

[Jussi Pakkanen (jpakkane)]

As it does not boot, I can't run the command.

I'll try to do it once I get a new, working boot image done.

[penalvch (penalvch)]

Jussi Pakkanen, thank you for reporting this and helping make Ubuntu better. The next step would be to fully commit bisect from Trusty to Utopic, in order to identify the offending commit. Could you please do this following https://wiki.ubuntu.com/Kernel/KernelBisection ?

[Jussi Pakkanen (jpakkane)]

Unfortunately I can't bisect due to the following reasons:

- when I tried to boot an older kernel (that used to work IIRC) and it failed in the same way
- the failing kernel worked a few times, but just died on some random boot, so this bug has some random component
- because the computer was completely unusable I had to wipe it and reinstall trusty which has been working thus far

[penalvch (penalvch)]

Jussi Pakkanen, could you please provide the missing information following https://wiki.ubuntu.com/DebuggingKernelBoot ?

[Jussi Pakkanen (jpakkane)]

I can not because I had to wipe the machine and install trusty, so the kernel is not the same version any more.

[penalvch (penalvch)]

Jussi Pakkanen, did the issue occur with a live environment? If so, providing the request information from it would be fine.

[Colin Ian King (colin-king)]

The underlying issue was that this was booting in CSM mode and the x2apic wasn't being configured correctly causing an SMP boot to hang.

We solved this issue by using the EFI grub loader to avoid booting in CSM mode.

1. add /boot/efi /etc/fstab
2. install grub-efi

running grub-install --target=x86_64
and reboot.

[Colin Ian King (colin-king)]

This can also be avoided by install with the standard desktop image using EFI install mode rather than installing with the mac desktop ISO image.