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From: "dsmith at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/20820] another "soft lockup" BUG on RHEL7 ppc64
Date: Fri, 18 Nov 2016 19:01:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D20820

--- Comment #3 from David Smith <dsmith at redhat dot com> ---
(In reply to David Smith from comment #2)
> I've tracked this down to the systemtap.base/optim_stats.exp testcase. I =
get
> the "soft lockup" bug on ppc64 every time I've run this test (admittedly =
on
> a very small sample).

The optim_stats.exp testcase runs 2 scripts: systemtap.base/optim_stats1.stp
and systemtap.base/optim_stats2.stp. The latter script causes the BUG:

=3D=3D=3D=3D
# stap -g --suppress-time-limits
../src/testsuite/systemtap.base/optim_stats2.stp=20

Message from syslogd@ibm-p8-01-lp7 at Nov 18 13:59:04 ...
 kernel:BUG: soft lockup - CPU#9 stuck for 23s! [stapio:27761]
ERROR: division by 0 near operator '/' at
../src/testsuite/systemtap.base/optim_stats2.stp:48:28
IGNORE 300000000
IGNORE 300000000 29999850000000 0 199999
WARNING: Number of errors: 1, skipped probes: 0
WARNING: /usr/local/bin/staprun exited with status: 1
Pass 5: run failed.  [man error::pass5]
=3D=3D=3D=3D

--=20
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