[issue36702] test_dtrace failed

[Brian Costlow]

Brian Costlow  added the comment:

There are actually two different issues here.

dtrace -q will not work on Fedora-based linux (haven't tried elsewhere) and 
that probably should be corrected, but that is NOT what causes the test fail. 

The tests' setup checks whether dtrace is usuable, and since it is not, those 
tests are skipped. 

However, stap IS usable, so those tests run.

test.test_dtrace.SystemTapOptimizedTests.test_line will always fail because it 
expects files in dtracedata (line.stp and line.stp.expected) that are not there.

I've attached a file showing isolated runs of test_dtrace on a newly built 
Python 3.8.6 on two Centos 7 systems.

The first is against the official Centos 7 Docker container, and stap fails 
because Linuxkit kernel modules are not installed. The test_dtrace check for a 
working stap fails, and all 4 tests are skipped.

The second is against a virtualized Centos 7 where the kernel modules are 
properly installed and stap works.

I don't see how test_dtrace ever passes on a system with a working /bin/stap 
command.

--
nosy: +brian.costlow
Added file: https://bugs.python.org/file49696/test_dtrace_stap_bug.txt

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[issue36702] test_dtrace failed

[Thomas Chan]

Change by Thomas Chan :


--
nosy: +tchan

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[issue36702] test_dtrace failed

[will rogers]

will rogers  added the comment:

I also encountered this on Scientific Linux 7.4 (Linux 
3.10.0-693.11.6.el7.x86_64) while trying to build Python 3.8.0.

I think it is due to differences in versions of 'dtrace' on different platforms.
On my MacOS-X v10.14.6 (Mojave) system, the 'dtrace' command has a  -q (quiet 
the output) option.
On SL 7.4, it does not. The options are quite different.


This is output and versions from my test run:

./python  ./Tools/scripts/run_tests.py 
== CPython 3.8.0 (default, Oct 29 2019, 14:37:09) [GCC 4.8.5 20150623 (Red 
Hat 4.8.5-16)]
== Linux-3.10.0-693.11.6.el7.x86_64-x86_64-with-glibc2.17 little-endian
== cwd: /opt/Python-3.8.0/build/test_python_30482
== CPU count: 2
== encodings: locale=UTF-8, FS=utf-8

Below is an error from the test log that shows the 'q' option being rejected 
from 'dtrace' (linux'):

0:10:16 load avg: 1.79 Re-running test_dtrace in verbose mode
skipped "dtrace(1) failed: ('/usr/bin/dtrace', 'invalid option', 
'-q')\nUsage /usr/bin/dtrace [--help] [-h | -G] [-C [-I]] -s File.d [-o 
]"

Assuming 'dtrace' is run as a sub-process, the different versions could be 
producing very different results.

I attached a (clipped) version of my 'make test' output, it is essentially the 
same as sayno996's results.
There are also some error from 'test_nis" which can be ignoed for this issue.

I hope this helps.

--
nosy: +willrogers3
versions: +Python 3.8
Added file: https://bugs.python.org/file48687/make_test-clipped.txt

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[issue36702] test_dtrace failed

[STINNER Victor]

Change by STINNER Victor :


--
nosy: +vstinner

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[issue36702] test_dtrace failed

[sayno996]

New submission from sayno996 :

I install Python 3.7.3 on CentOS 7.6. However, when I run "make test", I got a 
failure on test_dtrace as:

Ran 8 tests in 4.752s

FAILED (failures=6, skipped=2)
test test_dtrace failed
test_dtrace failed

== Tests result: FAILURE ==

1 test failed:
test_dtrace

Total duration: 4 sec 771 ms
Tests result: FAILURE

--
components: Build
files: test.log
messages: 340692
nosy: sayno996
priority: normal
severity: normal
status: open
title: test_dtrace failed
type: compile error
versions: Python 3.7
Added file: https://bugs.python.org/file48284/test.log

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