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[Launchpad Bug Tracker <1571590@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package makedumpfile - 1:1.5.9-5ubuntu1

---------------
makedumpfile (1:1.5.9-5ubuntu1) yakkety; urgency=medium

  [Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx>]
  * Fix networked kdump failure to reach remote server. Avoids
    "Network is unreachable" message when trying to do remote dumps on either
    SSH or NFS. (LP: #1571590)

 -- Louis Bouchard <louis.bouchard@xxxxxxxxxx>  Fri, 29 Apr 2016
10:43:58 +0200

** Changed in: makedumpfile (Ubuntu)
       Status: In Progress => Fix Released

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Title:
  pVM:pinelp2:ubuntu 16.04: Network is unreachable when using ssh in
  kdump

Status in makedumpfile package in Ubuntu:
  Fix Released
Status in makedumpfile source package in Xenial:
  Confirmed

Bug description:
  Problem Description
  ============================
  When dumping to ssh target , kdump failed:

           Starting Kernel crash dump capture service...
  [   18.542292] kdump-tools[2748]: Starting kdump-tools: ssh: connect to host 10.33.31.113 port 22: Network is unreachable
  [   18.542894] kdump-tools[2748]:  * kdump-tools: Unable to reach remote server root@10.33.31.113. No reason to continue
  [   18.613376] kdump-tools[2748]: Mon, 11 Apr 2016 01:23:55 -0500
  [   19.310893] kdump-tools[2748]: Rebooting.
  [   19.652714] reboot: Restarting system

  But the weired thing is that nfs target works on the same system.
   
  ---uname output---
  Linux pinelp2 4.4.0-18-generic #34-Ubuntu SMP Wed Apr 6 14:00:30 UTC 2016 ppc64le ppc64le ppc64le GNU/Linux
   
  Steps to Reproduce
  ===================================
  1. install latest ubuntu 16.04 on pinelp2
  2. config kdump to use ssh:
  SSH="root@10.33.31.113"
  3. run "kdump-config propagate" as root 
  4. trigger kdump

   
  Userspace tool common name: kdump-tools 
   
  The userspace tool has the following bit modes: 64-bit 

  Userspace rpm: version 1:1.5.9-5

  == Comment: #8 - Ping Tian Han <pthan@xxxxxxxxxx> - 2016-04-17 21:58:52 ==
  (In reply to comment #6)
  > I am able to reproduce this issue as well. 
  > Ping, what is you try to dump on some other machine with ssh ? Does it still
  > complain the same ? Is the ssh failing to connect to the network ?

  I saw the same problem when dumping to medlp4 with ssh:

           Starting Kernel crash dump capture service...
  [   17.293028] kdump-tools[2733]: Starting kdump-tools: ssh: connect to host 10.33.7.181 port 22: Network is unreachable
  [   17.293692] kdump-tools[2733]:  * kdump-tools: Unable to reach remote server root@10.33.7.181. No reason to continue
  [   17.405333] kdump-tools[2733]: Sun, 17 Apr 2016 20:56:59 -0500
  [   18.536587] kdump-tools[2733]: Rebooting.
  [   18.903280] reboot: Restarting system

  but I can ssh log noto medlp4 before triggering kdump.

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