Hence, this needs to land in bionic (and cosmic) - disco (and eoan)
kernels are already > 4.20
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Status: New => Triaged
** Changed in: ubuntu-z-systems
Importance: Undecided => High
** Changed in: ubuntu-z-systems
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
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https://bugs.launchpad.net/bugs/1828166
Title:
perf top problem on z with Ubuntu 18.04
Status in Ubuntu on IBM z Systems:
Triaged
Status in linux package in Ubuntu:
New
Bug description:
perf top hangs and shows error messages
---uname output---
Linux weather 4.15.0-46-generic #49-Ubuntu SMP Wed Feb 6 09:32:27 UTC 2019
s390x s390x s390x GNU/Linux
---Steps to Reproduce---
I start a benchmark (mem_alloc, but it really doesn't matter) and then issue
perf top in a second terminal, the output from perf top is correct. Now I stop
the benchmark: perf top shows a error message (Not enough memory for annotating
'__irf_end' symbol!) and I can't quit from perf top anymore
Following analyse took place:
No problem with current kernel .
Bi-Secting of perf tool took place and following commit was found:
commit edeb0c90df3581b821a764052d185df985f8b8dc (HEAD, refs/bisect/bad)
Author: Arnaldo Carvalho de Melo <a...@redhat.com>
Date: Tue Oct 16 17:08:29 2018 -0300
perf tools: Stop fallbacking to kallsyms for vdso symbols lookup
When you apply this patch the issue is gone, however it is contained
in these versions:
git tag --contains edeb0c90df3581b821
v4.19
v4.20
....
The level I was debugging was kernel 4.15 which does not contain this
patch.
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