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


Tested with upstream kernel 4.0  and 4.0.9 on a 32 bit VM. With both of this version VM booted as expected without issues.
Also I tested with upstream kernel 4.1  and VM did not boot. I expect that the issue is present for first time in upstream kernel 4.1.

My question is:  Could you please, help me to bisect this issue?

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

Status in linux package in Ubuntu:

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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