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[Launchpad Bug Tracker <1599561@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/1599561

Title:
  Ubuntu 16.04.01 kdump: IP prefix is missing in the directory name
  after first dump during kdump over ssh.

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

Bug description:
  [SRU justification]
  HOSTTAG=ip is unusable without this fix on some platforms

  [Impact]
  HOSTTAG functionality works as expected.

  [Fix]
  Loop on hostname -I for five seconds. Revert to HOSTTAG=hostname if IP address not found.

  [Test Case]
  The race condition is difficult to run into but the bug reporter has been able to confirm the change from a PPA (see comment #5).

  [Regression]
  Minimal, as the code path is only enhanced by one loop. Exit path remains the same.

  [Original description of the problem]

  == Comment: #0 - PAVITHRA R. PRAKASH - 2016-06-30 07:12:40 ==
  ---Problem Description---

  During kdump over ssh IP prefix will be present only in first dump,
  subsequent dumps will not have IP in directory name.

  ---Steps to Reproduce---

  1) apt-get install linux-crashdump
  2) increase crashdump size:
  sudo vim /etc/default/grub.d/kexec-tools.cfg

  GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT crashkernel
  =2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M

  3) sudo update-grub ; reboot the machine
  4) sudo sed -i 's/USE_KDUMP=0/USE_KDUMP=1/g' /etc/default/kdump-tools
  5) kdump-config show # should show "ready to dump"
  6) ssh-keygen -t rsa
  7) Edit below parameters in /etc/default/kdump-tools
  SSH="root@<server IP>"
  SSH_KEY=/root/.ssh/id_rsa
  8)  kdump-config propagate
  9)  kdump-config show
  10) reboot
  11) echo "c" > /proc/sysrq-trigger
  12) verify dump is created in ssh server.
  13) trigger the crash again.

  Logs
  =====
  root@ubuntu:/home/ubuntu# uname -a
  Linux ubuntu 4.4.0-26-generic #45-Ubuntu SMP Mon Jun 20 17:27:01 UTC 2016 ppc64le ppc64le ppc64le GNU/Linux

  dumps on ssh server when 3 crashes are triggered
  ------------------------------------------------------------------------
  [root@ltc-fire5 crash]# ls
  192.168.122.25-201606300523
  [root@ltc-fire5 crash]# ls
  192.168.122.25-201606300523  -201606300524
  [root@ltc-fire5 crash]# ls
  192.168.122.25-201606300523  -201606300524  -201606300525
  [root@ltc-fire5 crash]# cd -201606300524
  -bash: cd: -2: invalid option
  cd: usage: cd [-L|[-P [-e]]] [dir]
  [root@ltc-fire5 crash]# cd -- -201606300524
  [root@ltc-fire5 -201606300524]# ls
  dmesg.201606300524  dump.201606300524

  == Comment: #8 - Kevin W. Rudd - 2016-07-05 18:23:01 ==

  Canonical,

  The behavior appears to be somewhat intermittent, and it looks as if
  define_stampdir() might be getting called before the network init has
  completed.  If delaying this function is not practical, it might be
  helpful to have define_stampdir() fall back to using just "hostname"
  if "hostname -I" doesn't return any useful information for setting
  THIS_HOST.

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