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

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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.

** Affects: s390-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: s390x
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dbginfo.sh does not complete on Ubuntu 16.04(.5)
https://bugs.launchpad.net/bugs/1799208
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