[Bug 1799208] Re: dbginfo.sh does not complete on Ubuntu 16.04(.5)

[Brian Murray]

Hello Frank, or anyone else affected,

Accepted s390-tools into xenial-proposed. The package will build now and
be available at
https://launchpad.net/ubuntu/+source/s390-tools/1.34.0-0ubuntu8.9 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-xenial to verification-done-xenial. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: s390-tools (Ubuntu)
       Status: In Progress => Fix Released

** Changed in: s390-tools (Ubuntu Xenial)
       Status: New => Fix Committed

** Tags added: verification-needed verification-needed-xenial

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https://bugs.launchpad.net/bugs/1799208

Title:
  dbginfo.sh does not complete on Ubuntu 16.04(.5)

Status in Ubuntu on IBM z Systems:
  In Progress
Status in s390-tools package in Ubuntu:
  Fix Released
Status in s390-tools source package in Xenial:
  Fix Committed

Bug description:
  dbginfo.sh does not complete on Ubuntu 16.04(.5) using s390-tools
  version 1.34.0-0ubuntu8.7

  Execution starts and proceeds until step 4 'sysfs':
  $ sudo dbginfo.sh
  dbginfo.sh: Debug information script version 1.34.0-build-20180502
  Copyright IBM Corp. 2002, 2016

  Hardware platform     = s390x
  Kernel version        = 4.15.0 (4.15.0-33-generic)
  Runtime environment   = LPAR

  1 of 10: Collecting command output
   
  2 of 10: Collecting z/VM command output skipped - no z/VM environment
   
  3 of 10: Collecting procfs
   
  4 of 10: Collecting sysfs

  'dd' process with 100% CPU can be seen:

  # ps aux | grep [d]d\ 
  root     257158  100  0.0   2120   664 pts/0    R+   06:51  11:18 dd if=/sys/kernel/debug/tracing/trace status=noxfer iflag=nonblock of=/tmp/DBGINFO-2018-10-22-06-49-52-s1lp15-1F8F67//sys/kernel/debug/tracing/trace

  Happens on 16.04.5 with kernel 4.4 or HWE kernel 4.15.
  But works fine on 18.04 (with kernel 4.15) and s390-tools 2.3.0-0ubuntu3.

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