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[Launchpad Bug Tracker <1570775@xxxxxxxxxxxxxxxxxx>]

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 <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)

  * 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.bouchard@xxxxxxxxxx>  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/1570775

Title:
  makekdump should re-exec with cio_ignore on s390x

Status in Ubuntu on IBM z Systems:
  Fix Released
Status in makedumpfile package in Ubuntu:
  Fix Released
Status in makedumpfile source package in Xenial:
  Fix Released

Bug description:
  [SRU justification]
  kernel crash dump fails to work without the modification.

  [Impact]
  Broken functionality.

  [Fix]
  Add cio_ignore -k -y output to the kexec command.

  [Test Case]
  Follow indication in comment #2 to reproduce. With the fix, kdump will function as expected.

  [Regression]
  A regression situation is outlined in comment #16. Newer channel devices may not be visible because of the added cio_ignore output. This may be worked around with a single command. 

  The resolution outweights this limitation that can be easily worked
  around.

  [Original description of the problem]

  As per
  https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/1564475/comments/19

  We should re-exec with cio_ignore lines. As per report there, it
  should result in lowered required crashdump setting.

  Hypothetically, one should be able to test this imperially by lowering
  crashdump memory settings until kdump does not succeed anymore. And
  then generated and append `cio_ignore -k -u` to the
  KDUMP_CMDLINE_APPEND= and see that kdump starts working again with a
  lower memory usage.

  Once this is developed / verified / tested, we should probably SRU
  this back to xenial.

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