[issue25276] test_decimal sometimes crash on PPC64 AIX 3.x

[Stefan Krah]

Stefan Krah added the comment:

I've checked:  test_decimal does not require abnormal amounts of
memory or stack. On Linux/x86 a stack size of 256 (default 8192)
is sufficient, and memory requirements aren't that high.

We assumed that there is some memory limit on the buildbot, since
in a later run test #pwmx330 failed with MemoryError.


The easiest way to debug this is to rerun the whole test suite
under gdb with the same random seed as in


http://buildbot.python.org/all/builders/PPC64%20AIX%203.x/builds/4173/steps/test/logs/stdio

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[issue25276] test_decimal sometimes crash on PPC64 AIX 3.x

[Stefan Krah]

Stefan Krah added the comment:

Usually these segfaults are toolchain bugs (I've had at least 8,
including gcc, suncc, libc...).


Just a couple of observations:

  - The bot builds with -DCONFIG_32=1 -DANSI=1 despite being PPC64.

  - When we had an AIX snakebite machine, the xlc compile worked on
AIX (using about 50 obscure command line arguments).

  - In the default build, libmpdec functions use a lot of stack
memory (for optimization while avoiding alloca). But there are
no recursive tests, so a stack overflow would seem unlikely.

--
nosy: +David.Edelsohn

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[issue25276] test_decimal sometimes crash on PPC64 AIX 3.x

[David Edelsohn]

David Edelsohn added the comment:

The system has 128GB of memory.  The process limits are set to unlimited for 
data.  AIX defaults to 32 bit, although all processors are 64 bit, so the 
buildbot runs as 32 bit.  What does low free memory in the buildbot mean?

I'm surprised that Python requires a huge amount of memory for the tests.  It's 
possible that Python needs to be built with special options to allow additional 
malloc space (-bmaxdata:0xN000).

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[issue25276] test_decimal sometimes crash on PPC64 AIX 3.x

[STINNER Victor]

New submission from STINNER Victor:

This buildbot has low free memory. Maybe some part of _decimal doesn't handle 
an allocation failure?

http://buildbot.python.org/all/builders/PPC64%20AIX%203.x/builds/4173/steps/test/logs/stdio

...
[307/399/10] test_decimal
Fatal Python error: Segmentation fault

Current thread 0x0001 (most recent call first):
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/test_decimal.py",
 line 444 in eval_equation
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/test_decimal.py",
 line 321 in eval_line
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/test_decimal.py",
 line 299 in eval_file
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/test_decimal.py",
 line 5591 in 
  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/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/test_decimal.py",
 line 5598 in test_main
  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 292 in run_tests_sequential
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/libregrtest/main.py",
 line 334 in run_tests
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/libregrtest/main.py",
 line 365 in main
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/libregrtest/main.py",
 line 407 in main
  File 
"/home/shager/cpython-buildarea/3.x.edelsohn-aix-ppc64/build/Lib/test/libregrtest/main.py",
 line 429 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
make: *** [buildbottest] Segmentation fault (core dumped)

--
messages: 251919
nosy: haypo
priority: normal
severity: normal
status: open
title: test_decimal sometimes crash on PPC64 AIX 3.x
versions: Python 3.6

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[issue25276] test_decimal sometimes crash on PPC64 AIX 3.x

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


--
components: +Extension Modules
type:  -> crash

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