This bug was fixed in the package s390-tools - 1.34.0-0ubuntu8.9
---------------
s390-tools (1.34.0-0ubuntu8.9) xenial; urgency=medium
* dump2tar: backport utility
* dbginfo.sh: backport patch to use dump2tar instead of walking sysfs
* Addresses dbginfo.sh hanging indefinately whilst walking sysfs. LP:
#1799208
-- Dimitri John Ledkov <x...@ubuntu.com> Wed, 23 Jan 2019 07:36:29
-0500
** Changed in: s390-tools (Ubuntu Xenial)
Status: Fix Committed => Fix Released
--
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Matching subscriptions: Ubuntu 16.04 Bugs
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 Released
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
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-z-systems/+bug/1799208/+subscriptions
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