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[Bug 1555786] Re: [Hyper-V] VM with ubuntu 32bit with linux-next does not boot

 

Sorry for the delay.  I figured out the build failure for the bisect.

I built the first test kernel, up to the following commit:
6c373ca89399c5a3f7ef210ad8f63dc3437da345

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1556875

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

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https://bugs.launchpad.net/bugs/1555786

Title:
  [Hyper-V] VM with ubuntu 32bit with linux-next does not boot

Status in linux package in Ubuntu:
  Triaged

Bug description:
  We identified that at least ubuntu (let's take 15.10) does not boot if
  installed in the 32bit architecture, and using the linux-next upstream
  kernel 4.5 on it. This has been seen on other distributions as well.

  We took both the official linux-next branch from kernel.org and the one from kernel.ubuntu.com v4.5-rc7.
  For the compilation process we went either with the 4.2 kernel config file from the installed running kernel, and also built the config separately. 
  No errors have been encountered during the build or install process of the 4.5 kernel, however at boot, the VM will just hang.
  There are no call traces or messages at boot to show any pottential issue.

  Have you seen this on your end when testing the 32bit build?
  Attaching the full serial log for reference, however I don't see any errors in the kernel boot process.

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