This bug was fixed in the package makedumpfile - 1:1.5.9-5ubuntu0.1
---------------
makedumpfile (1:1.5.9-5ubuntu0.1) xenial; urgency=medium
[ Hari Bathini <hbath...@linux.vnet.ibm.com> ]
* 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)
* Replace maxcpus by nr_cpus
nr_cpus is a hard limit that has an impact on the (kdump) kernel
memory consumption, while it is not the case with maxcpus=1, as we can
theoretically hotplug cpus with maxcpus=1 (LP: #1568952)
* define_stampdir() : Loop on hostname -I for 5 sec to get IP address
if HOSTTAG=ip. The network stack may not be ready when kdump-config runs.
Give it some time before reverting HOSTTAG to hostname if an IP address
cannot be found. (LP: #1599561)
* Add cio_ignore result to /etc/default/kdump-tools on s390x
In order to have crashkernel=128M to work correctly on the s390
architecture the result of cio_ignore -u -k needs to be appended to the
KDUMP_CMDLINE_APPEND variable in /etc/default/kdump-tools. This patch
adds the required logic to do the proper modification. (LP: #1570775)
* debian/rules : drop the dh_installinit override
Uses a syntax which is no longer supported and generate an error on
install. (LP: #1599491)
-- Louis Bouchard <louis.bouch...@ubuntu.com> Fri, 22 Jul 2016
10:15:20 +0200
** Changed in: makedumpfile (Ubuntu Xenial)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1571590
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:
Fix Released
Bug description:
[SRU justification]
Without this fix, networked enabled kernel dump will fail to complete.
[Impact]
Broken networked functionality
[Fix]
Add a Wants target to the systemd unit.
[Test Case]
Follow "Test to reproduce" in Original Problem description.
[Regression]
None expected, the existing systemd unit setup remains but is improved by
proposed fix.
[Description of the problem]
Original 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 <pt...@cn.ibm.com> - 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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