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

[Frank Heimes]

Successfully verified on xenial using proposed package - adjusted the
tags accordingly.

Added a section regarding regression risk to the bug description.

** Attachment added: "verification_xenial.txt"
   https://bugs.launchpad.net/ubuntu/+source/s390-tools/+bug/1799208/+attachment/5236277/+files/verification_xenial.txt

** Description changed:

  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\ 
+ # 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.
+ 
+ ----------
+ 
+ The regression risk of this fixed dbginfo.sh script and the updated
+ s390-tools package is very low for the following reasons:
+ 
+ - the script is broken today on xenial, hence it cannot really get that worse...
+ - the fix was provided by IBM via a newer s390-tools package and was pretested by IBM before it was made available
+ - all this is limited to the s390x architecture and also to xenial (newer Ubuntu releases use newer packages)
+ - newer s390-tools packages that already incl. the fix are used in newer Ubuntu server releases and are known to work there

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

** Changed in: ubuntu-z-systems
       Status: In Progress => Fix Committed

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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:
  Fix Committed
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.

  ----------

  The regression risk of this fixed dbginfo.sh script and the updated
  s390-tools package is very low for the following reasons:

  - the script is broken today on xenial, hence it cannot really get that worse...
  - the fix was provided by IBM via a newer s390-tools package and was pretested by IBM before it was made available
  - all this is limited to the s390x architecture and also to xenial (newer Ubuntu releases use newer packages)
  - newer s390-tools packages that already incl. the fix are used in newer Ubuntu server releases and are known to work there

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