Segmentation fault due to faulthandler on Solaris

[kulikjak]

BPO	35484
Nosy	@kulikjak, @peadar
Files	crash_stack.txt: stack trace reproduce.py

^{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 2019-08-08.09:25:58.951>
created_at = <Date 2018-12-13.15:38:08.882>
labels = ['extension-modules', 'interpreter-core', '3.7', 'type-crash']
title = 'Segmentation fault due to faulthandler on Solaris'
updated_at = <Date 2019-08-08.09:25:58.946>
user = 'https://github.com/kulikjak'

bugs.python.org fields:

activity = <Date 2019-08-08.09:25:58.946>
actor = 'kulikjak'
assignee = 'none'
closed = True
closed_date = <Date 2019-08-08.09:25:58.951>
closer = 'kulikjak'
components = ['Extension Modules', 'Interpreter Core']
creation = <Date 2018-12-13.15:38:08.882>
creator = 'kulikjak'
dependencies = []
files = ['47993', '47994']
hgrepos = []
issue_num = 35484
keywords = []
message_count = 4.0
messages = ['331763', '331764', '349179', '349227']
nosy_count = 2.0
nosy_names = ['kulikjak', 'peadar']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue35484'
versions = ['Python 3.7']

[kulikjak]

When running tests on Solaris (amd64) I noticed that one test in test_faulthandler.py fails with the segmentation fault.

I have attached program reproducing this issue and its core stack trace. Program runs entirely with *Ending* printed as well and segfaults somewhere in the sys.exit() during deallocation.

Problem doesn't appear when chain variable is set to False or if faulthandler is unregistered. Also, this bug appears only with --enable-optimizations on, but probably it just doesn't manifest itself in non optimized build (or on sparc).

I am not sure how to diagnose it more so I am at least reporting this issue.

[kulikjak]

The exact failing test is test_register_chain().

Output of this failed test (as expected for segmentation fault):

======================================================================
FAIL: test_register_chain (test.test_faulthandler.FaultHandlerTests)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "xxx/Python-3.7.1/Lib/test/test_faulthandler.py", line 708, in test_register_chain
    self.check_register(chain=True)
  File "xxx/Python-3.7.1/Lib/test/test_faulthandler.py", line 686, in check_register
    self.assertEqual(exitcode, 0)
AssertionError: -11 != 0

[peadar]

This is likely a duplicate of bpo-21131

[kulikjak]

Oh, thanks for the catch, it most likely is.