[issue25276] Intermittent segfaults on PPC64 AIX 3.x

[STINNER Victor]

STINNER Victor added the comment:

The origin of the crash is unknown. Since I didn't see the crash recently, I 
close the issue.

--
resolution:  -> out of date
status: open -> closed

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[issue25276] Intermittent segfaults on PPC64 AIX 3.x

[Stefan Krah]

Stefan Krah added the comment:

> It's possible that Python needs to be built with special options to allow 
> additional malloc space (-bmaxdata:0xN000).

It seems to be the case, see Misc/README.AIX.  This could explain the
MemoryErrors, but not the segfaults.


Are computed-gotos stable on gcc-AIX?  The README recommends disabling
them for xlc.


I'm also not sure how well Python supports threads on AIX. Often
these problems go away on unsupported platforms when configuring
--without-threads.

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[issue25276] Intermittent segfaults on PPC64 AIX 3.x

[David Edelsohn]

David Edelsohn added the comment:

Misc/README.AIX comments about XLC do not apply to GCC.

One can adjust the memory space at normal link time with 
-Wl,-bmaxdata:0xN000. This trades off heap for shared memory segments. One 
does not need the extra ldedit stop, which stuffs the same value into the 
application header.

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[issue25276] Intermittent segfaults on PPC64 AIX 3.x

[David Edelsohn]

David Edelsohn added the comment:

As we have seen with similar issues on other targets, this likely is due to the 
random order of tests.  In another case, the timezone was not being restored 
properly by GLIBC.  Another test is leaving the process in a state that somehow 
evokes this failure from test_decimal.

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[issue25276] Intermittent segfaults on PPC64 AIX 3.x

[Stefan Krah]

Stefan Krah added the comment:

If you have time, you could use an explicit seed (and gdb):

# test_email segfault:
./python -m test -j 1 -u all -W --randseed 5634141

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[issue25276] Intermittent segfaults on PPC64 AIX 3.x

[Stefan Krah]

Stefan Krah added the comment:

And the segfaults are apparently somewhat random. This is beginning
to look like an issue unrelated to decimal that was perhaps recently
introduced (in which case "hg bisect" would be the fastest
way to debug).


http://buildbot.python.org/all/builders/PPC64%20AIX%203.x/builds/4183/steps/test/logs/stdio

[129/399/3] test_email
Fatal Python error: Segmentation fault

Current thread 0x0001 (most recent call first):
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/email/utils.py",
 line 57 in _has_surrogates
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/email/message.py",
 line 264 in get_payload
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/test_email/test_email.py",
 line 3463 in test_long_lines
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/unittest/case.py",
 line 600 in run
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/unittest/case.py",
 line 648 in __call__
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/unittest/suite.py",
 line 122 in run
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/unittest/suite.py",
 line 84 in __call__
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/unittest/suite.py",
 line 122 in run
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/unittest/suite.py",
 line 84 in __call__
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/unittest/suite.py",
 line 122 in run
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/unittest/suite.py",
 line 84 in __call__
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/unittest/suite.py",
 line 122 in run
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/unittest/suite.py",
 line 84 in __call__
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/unittest/suite.py",
 line 122 in run
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/unittest/suite.py",
 line 84 in __call__
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/unittest/runner.py",
 line 176 in run
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/support/__init__.py",
 line 1775 in _run_suite
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/support/__init__.py",
 line 1809 in run_unittest
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/libregrtest/runtest.py",
 line 159 in test_runner
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/libregrtest/runtest.py",
 line 160 in runtest_inner
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/libregrtest/runtest.py",
 line 113 in runtest
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/libregrtest/main.py",
 line 289 in run_tests_sequential
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/libregrtest/main.py",
 line 331 in run_tests
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/libregrtest/main.py",
 line 362 in main
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/libregrtest/main.py",
 line 404 in main
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/libregrtest/main.py",
 line 426 in main_in_temp_cwd
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/__main__.py",
 line 3 in 
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/runpy.py", 
line 85 in _run_code
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/runpy.py", 
line 170 in _run_module_as_main

--
title: test_decimal sometimes crash on PPC64 AIX 3.x -> Intermittent segfaults 
on PPC64 AIX 3.x

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[issue25276] Intermittent segfaults on PPC64 AIX 3.x

[STINNER Victor]

STINNER Victor added the comment:

I suggest to isolate tests using -j1: see my issue #25285.

(Currently, -j1 doesn't use subprocesses.)

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