BUILD: AIX-64-bit segmentation fault using xlc-v11

[aixtools]

BPO	42309
Nosy	@aixtools, @kadler

^{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 = None
created_at = <Date 2020-11-10.11:44:55.949>
labels = ['build', '3.9', 'type-crash']
title = 'BUILD: AIX-64-bit segmentation fault using xlc-v11'
updated_at = <Date 2021-01-06.16:41:47.483>
user = 'https://github.com/aixtools'

bugs.python.org fields:

activity = <Date 2021-01-06.16:41:47.483>
actor = 'Michael.Felt'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Build']
creation = <Date 2020-11-10.11:44:55.949>
creator = 'Michael.Felt'
dependencies = []
files = []
hgrepos = []
issue_num = 42309
keywords = []
message_count = 6.0
messages = ['380654', '380693', '380951', '381094', '381104', '384511']
nosy_count = 2.0
nosy_names = ['Michael.Felt', 'kadler']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue42309'
versions = ['Python 3.9']

[aixtools]

Successfully built and packaged the Python-3.9.0 distribution tar archive without modification - as 32-bit.

Repeating the same process with the following environment change:

# export OBJECT_MODE=64

fails with a segmentation fault by the "first-phase" python executable:

        ../src/py39-3.9.0/Modules/makexp_aix Modules/python.exp "." libpython3.9.a
         xlc_r     -Wl,-bE:Modules/python.exp -lld -o python Programs/python.o libpython3.9.a -lintl -ldl  -lm   -lm
         ./python -E -S -m sysconfig --generate-posix-vars ; if test $? -ne 0 ; then  echo "generate-posix-vars failed" ;  rm -f ./pybuilddir.txt ;  exit 1 ;  fi
/bin/sh: 6291700 Segmentation fault(coredump)
make: 1254-004 The error code from the last command is 139.


Stop.
root@x066:[/data/prj/python/py39-3.9.0]./python -E -S -m sysconfig --generate-posix-vars
Segmentation fault(coredump)
root@x066:[/data/prj/python/py39-3.9.0]./python
Segmentation fault(coredump)

Will try to duplicate in a second environment.

[aixtools]

On a different server, different compiler (xlc-v13, mine is xlc-v11) it gets past this point.

So, perhaps it is a compiler issue.

As the second system is missing many 64-bit libraries - still cannot build 64-bit Python-3.9.

Low priority - imho.

[kadler]

I have not encountered this problem when building Python 3.10 on AIX and PASE with GCC 6.3.

[aixtools]

Added "using xlc" to description.

When I have a system that has 64-bit support for gcc - I'll verify that it works, or does not work, for me using gcc.

[aixtools]

For now, I am going to suggest closing this - as a bug in the xlc-v11 compiler - and not worth researching.

I am able to build the 3.9 distribution as well as the 3.10 master using the xlC-v13-1.3.2 (Try and Buy) version.

Thanks for thinking together!