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[Bug 1570441] Re: Kernel Panic in Ubuntu 16.04 netboot installer


Ugh, looking this morning there is a whole bulk of patches referring to be fixes for the initial
  1f12e32f4cd5 ("x86/topology: Create logical package id")

* commit ee6825c80e870fff1a370c718ec77022ade0889b
   x86/topology: Fix AMD core count
* commit ed6069be7204541c1da532ad8bbf892e34513552
   xen/apic: Provide Xen-specific version of cpu_present_to_apicid APIC op
* commit 3e8db2246b434c6b18a6a9f09904038bddcf76c7
   x86/topology: Use total_cpus not nr_cpu_ids for logical packages
* commit 63d1e995be455ae9196270eb4b789de21afd42ed
   x86/topology: Fix Intel HT disable
* commit b5d5f27d938fb6fc8d3202704e699d2694a02da6
   x86/topology: Fix logical package mapping

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  Kernel Panic in Ubuntu 16.04 netboot installer

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  In Progress

Bug description:

  we are working with the Ubuntu 16.04 developer preview. Yesterday we
  observed a kernel panic of the installer kernel on one of our machines.
  The machine is of type

  Supermicro X10DRH LN4/X10DRH-CLN4, BIOS s1.0b 12/01/2015

  We are installing the machine via PXEboot with the netboot installer
  system using the following kernel/initrd:


  When using this version the kernel crashes (see attached log file). We
  have also tried the version 447 instead of 446. This version shows
  the same effect.

  Some time ago we worked with the installer version 441. This release
  worked as expected.

  Someone out there knows what has changed? It seems that the kernel has a
  problem with the harddisk IO system. In our machine the mpt3sas disk
  controller is required to get access to the harddisks.

  If I should test some new stuff please let me know. Or if I can help you
  in some other way to solve this issue contact me.

  Thank you for your help
    Dr. Johann Pfefferl

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