/proc/vmcore is generated by kdump support in the kernel. This might not
be a bug, but a case of missing support for regenerating /proc/vmcore
entries after DLPAR memory removal.

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  ISST-LTE:pVM:roselp4:ubuntu 17.04: kdump failed after memory DLPAR

Status in linux package in Ubuntu:

Bug description:
  ---Problem Description---
  After a memory DLPAR removal, kdump doesn't work:

           Starting Kernel crash dump capture service...
  [   67.714593] kdump-tools[3850]: Starting kdump-tools:  * running 
makedumpfile -c -d 31 /proc/vmcore /var/crash/201702230005/dump-incomplete
  Copying data                       : [  2.1 %] -/usr/sbin/kdump-config: line 
639:  3897 Bus error               makedumpfile $MAKEDUMP_ARGS $vmcore_file 
  [   72.314140] kdump-tools[3850]:  * kdump-tools: makedumpfile failed, 
falling back to 'cp'
  [   73.693881] kdump-tools[3850]: cp: error reading '/proc/vmcore': Bad 
  [   73.704152] kdump-tools[3850]:  * kdump-tools: failed to save vmcore in 
  [   73.823643] kdump-tools[3850]:  * running makedumpfile --dump-dmesg 
/proc/vmcore /var/crash/201702230005/dmesg.201702230005
  [   73.973813] kdump-tools[3850]: The kernel version is not supported.
  [   73.974078] kdump-tools[3850]: The makedumpfile operation may be 
  [   73.983506] kdump-tools[3850]: The dmesg log is saved to 
  [   73.983752] kdump-tools[3850]: makedumpfile Completed.
  [   73.983998] kdump-tools[3850]:  * kdump-tools: saved dmesg content in 
  [   74.104555] kdump-tools[3850]: Thu, 23 Feb 2017 00:05:15 -0600
  [   74.233502] kdump-tools[3850]: Failed to read reboot parameter file: No 
such file or directory
  [   74.233782] kdump-tools[3850]: Rebooting.
  [   86.629777] reboot: Restarting system

  The kdump service should be restarted after the memory DLPAR operation.
  ---uname output---
  Linux roselp4 4.10.0-8-generic #10-Ubuntu SMP Mon Feb 13 14:00:06 UTC 2017 
ppc64le ppc64le ppc64le GNU/Linux

  Machine Type = lpar 
  A debugger is not configured
  ---Steps to Reproduce---
  1. config kdump on roselp4
  2. do a memory DLPAR removal operation
  3. trigger kdump

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