hyper-v: Unable to perform kernel crash dump on trusty

[Abhishek Gupta]

Hi folks,

I know we are past kernel freeze now but this is a very important issue to fix as kernel crash dump is a fundamental requirement for all our customers. I am attaching two patches. Both of them need to be applied to take care of this issue. Please accommodate in this release if possible otherwise please let me know how we can provide these as an update.

Thanks,
Abhishek

break-fix: - 03367ef5ea811475187a0732aada068919e14d61
break-fix: - e179f6914152eca9b338e7d8445684062f560c55

[Abhishek Gupta (abgupta)]

Please note that there are two patches. Please include both of them. They have also been sent upstream. Many thanks for your help on this.
Abhishek

[Tim Gardner (timg-tpi)]

This bug is not boot essential, therefore we'll pick these patches as part of the upstream stable update after being merged in Linus' repo..

[Andy Whitcroft (apw)]

The second of these went through a lot of upstream churn and the fixes are the below:

  commit 03367ef5ea811475187a0732aada068919e14d61
  Author: K. Y. Srinivasan <email address hidden>
  Date: Thu Apr 3 18:02:45 2014 -0700

    Drivers: hv: vmbus: Negotiate version 3.0 when running on ws2012r2 hosts

  commit e179f6914152eca9b338e7d8445684062f560c55
  Author: K. Y. Srinivasan <email address hidden>
  Date: Mon Apr 14 11:43:49 2014 -0700

    x86, irq, pic: Probe for legacy PIC and set legacy_pic appropriately

These are in v3.15-rc2 and v3.16-rc respectively.

$ git describe --contains 03367ef5ea811475187a0732aada068919e14d61
v3.15-rc2~11^2
$ git describe --contains e179f6914152eca9b338e7d8445684062f560c55
v3.16-rc1~23^2~2

[Chris Valean (cvalean)]

Same as 1317697, we've re-tested this on 14.04.1 and kernel panic and dump file creation is working as expected.
Kernel: 3.13.0-35

Please close this thread.