2.7: test_threading hangs on Solaris

[andreask]

BPO	5114
Nosy	@terryjreedy
Superseder	bpo-6643: Throw away more radioactive locks that could be held across a fork in threading.py
Files	bug-test_threading-hpux-solaris.log: Out of running test_threading on the affected machines

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2011-06-25.10:43:10.696>
created_at = <Date 2009-01-30.20:24:52.709>
labels = ['type-bug', 'tests']
title = '2.7:  test_threading hangs on Solaris'
updated_at = <Date 2011-06-25.10:43:10.694>
user = 'https://bugs.python.org/andreask'

bugs.python.org fields:

activity = <Date 2011-06-25.10:43:10.694>
actor = 'neologix'
assignee = 'none'
closed = True
closed_date = <Date 2011-06-25.10:43:10.696>
closer = 'neologix'
components = ['Tests']
creation = <Date 2009-01-30.20:24:52.709>
creator = 'andreask'
dependencies = []
files = ['12898']
hgrepos = []
issue_num = 5114
keywords = []
message_count = 8.0
messages = ['80836', '91734', '91735', '93030', '112702', '127050', '135617', '139042']
nosy_count = 7.0
nosy_names = ['terry.reedy', 'gps', 'andreask', 'rogerc', 'iandekit', 'neologix', 'Salman.Ahmed']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = '6643'
type = 'behavior'
url = 'https://bugs.python.org/issue5114'
versions = ['Python 2.7']

[andreask]

On two machines I have seen test_threading hang in ...
HPUX 11.22 ia64,
Solaris 5.8 sparc

The attached file contains the output of running

./apy/bin/python2.5 ./apy/lib/python2.5/test/regrtest.py -v test_threading

on the problematic machines.

It is necessary to kill one of the subprocesses to force forward
progress. A partial output of 'ps -ef' on the HPUX machine is

andreask 26601 26552 0 12:13:50 pts/1 0:00 ./apy/bin/python2.5
./apy/lib/python2.5/test/regrtest.py -v tes
andreask 26657 26601 0 12:14:26 pts/1 0:00
/home/andreask/tmp/autotest/apy/bin/python2.5 -c if 1:^J
andreask 26658 26657 0 12:14:26 pts/1 0:00
/home/andreask/tmp/autotest/apy/bin/python2.5 -c if 1:^J

And I usually kill the bottom most process.

[rogerc]

I can confirm the same exact issue exists in python2.6 on:
Solaris 5.8 sparc

Killing the bottom process worked for me as well

[rogerc]

Platform: Solaris 5.8 sparc
Compiler: gcc version 4.2.4

make test reported back the following on the initial test:
test test_threading failed -- Traceback (most recent call last):
  File
"/tools/webapps/local/src/Python-2.6.2/Lib/test/test_threading.py", line
419, in test_3_join_in_forked_from_thread
    self._run_and_join(script)
  File
"/tools/webapps/local/src/Python-2.6.2/Lib/test/test_threading.py", line
355, in _run_and_join
    self.assertEqual(data, "end of main\nend of thread\n")
AssertionError: '' != 'end of main\nend of thread\n'

---

Same type of issue further on in the testing:

test_1_join_on_shutdown (test.test_threading.ThreadJoinOnShutdown) ... ok
test_2_join_in_forked_process (test.test_threading.ThreadJoinOnShutdown)
... ok
test_3_join_in_forked_from_thread
(test.test_threading.ThreadJoinOnShutdown) ...
<hangs here>

$ ps -ef | grep -i 'python'
 xuserx 24669 17424  0 11:36:01 pts/18   5:44 ./python -E -tt
./Lib/test/regrtest.py -l
 xuserx 27539 27528  0 12:00:29 pts/18   0:00
/tools/webapps/local/src/Python-2.6.2/python -c if 1:            import
sys, o
 xuserx 27528 24669  0 12:00:28 pts/18   0:00
/tools/webapps/local/src/Python-2.6.2/python -c if 1:            import
sys, o
 xuserx 27660 29318  0 12:07:16 pts/18   0:00 grep -i python
$ kill 27539
<test continues then reports:>
test_3_join_in_forked_from_thread
(test.test_threading.ThreadJoinOnShutdown) ... FAIL

======================================================================
FAIL: test_3_join_in_forked_from_thread
(test.test_threading.ThreadJoinOnShutdown)
----------------------------------------------------------------------

Traceback (most recent call last):
  File
"/tools/webapps/local/src/Python-2.6.2/Lib/test/test_threading.py", line
419, in test_3_join_in_forked_from_thread
    self._run_and_join(script)
  File
"/tools/webapps/local/src/Python-2.6.2/Lib/test/test_threading.py", line
355, in _run_and_join
    self.assertEqual(data, "end of main\nend of thread\n")
AssertionError: '' != 'end of main\nend of thread\n'

I'll keep digging and see if I can find a solution, but know that while
I have extensive programming experience in other languages, I have none
in python (yet).

[iandekit]

FWIW it hangs on Solaris 9 also (sparc + x86)

[terryjreedy]

Still an issue in 2.7 or 3.1/2?

[SalmanAhmed]

Yes, this problem persists on Solaris 9 (SPARC) even with Python 2.7.1.
The problematic processes are:

ssahmed@blade:[~]$ ps -ef|grep -i python
ssahmed 480 418 0 15:30:25 pts/1 9:14 ./python -Wd -3 -E -tt ./Lib/test/regrtest.py -l
ssahmed 3062 480 0 15:43:22 pts/1 0:00 /space/home/ssahmed/Python-2.7.1/python -c if 1: import sys, os, ti
ssahmed 3063 3062 0 15:43:22 pts/1 0:00 /space/home/ssahmed/Python-2.7.1/python -c if 1: import sys, os, ti

I was able to workaround the problem by killing the bottom-most process in the list.

[neologix]

Hmm.
I think this was probably fixed by Gregory in issue bpo-6643 (it's not in Python 2.7.1).
Could you try with Python 3.2, or a current snapshot?

[neologix]

I'm closing.
Feel free to re-open if this fails with 2.7 or 3.2.