test_gdb fails on AMD64 FreeBSD Shared 3.x: ptrace: Operation not permitted

[vstinner]

BPO	39933
Nosy	@vstinner, @koobs

^{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 2020-04-21.01:09:18.326>
created_at = <Date 2020-03-11.11:56:43.540>
labels = ['3.8', '3.7', 'tests', '3.9']
title = 'test_gdb fails on AMD64 FreeBSD Shared 3.x: ptrace: Operation not permitted'
updated_at = <Date 2020-04-21.01:09:18.325>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-04-21.01:09:18.325>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-04-21.01:09:18.326>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2020-03-11.11:56:43.540>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 39933
keywords = []
message_count = 4.0
messages = ['363910', '363911', '364064', '366907']
nosy_count = 2.0
nosy_names = ['vstinner', 'koobs']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue39933'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[vstinner]

https://buildbot.python.org/all/#/builders/152/builds/384

Example:

======================================================================
FAIL: test_pycfunction (test.test_gdb.PyBtTests) [_testcapi.MethClass().meth_fastcall_keywords]
Verify that "py-bt" displays invocations of PyCFunction instances
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/test/test_gdb.py", line 896, in test_pycfunction
    self.assertIn(f'<built-in method {func_name}', gdb_output)
AssertionError: '<built-in method meth_fastcall_keywords' not found in 'Breakpoint 1 (meth_fastcall_keywords) pending.\nUnable to locate python frame\n'

Stderr:
Function "meth_varargs" not defined.
warning: Could not trace the inferior process.
warning: ptrace: Operation not permitted
During startup program exited with code 127.
No stack.
Function "meth_varargs" not defined.
warning: Could not trace the inferior process.
warning: ptrace: Operation not permitted
During startup program exited with code 127.
No stack.
(...)
Function "meth_fastcall_keywords" not defined.
warning: Could not trace the inferior process.
warning: ptrace: Operation not permitted
During startup program exited with code 127.
No stack.

[vstinner]

Same error on 3.7 and 3.8.

AMD64 FreeBSD Shared 3.7:
https://buildbot.python.org/all/#/builders/218/builds/91

[koobs]

Testing with security.bsd.unprivileged_proc_debug=1

[vstinner]

AMD64 FreeBSD Shared 3.x is green again, I close the issue.