collect_gdb fails for test.pythoninfo in several AMD64 FreeBSD buildbots

[pablogsal]

BPO	34388
Nosy	@pablogsal

^{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 2021-07-13.19:52:25.439>
created_at = <Date 2018-08-12.15:58:55.484>
labels = ['3.7', '3.8', 'build', 'tests', 'type-crash']
title = 'collect_gdb fails for test.pythoninfo in several AMD64 FreeBSD buildbots'
updated_at = <Date 2021-07-13.19:52:25.439>
user = 'https://github.com/pablogsal'

bugs.python.org fields:

activity = <Date 2021-07-13.19:52:25.439>
actor = 'pablogsal'
assignee = 'none'
closed = True
closed_date = <Date 2021-07-13.19:52:25.439>
closer = 'pablogsal'
components = ['Build', 'Tests']
creation = <Date 2018-08-12.15:58:55.484>
creator = 'pablogsal'
dependencies = []
files = []
hgrepos = []
issue_num = 34388
keywords = []
message_count = 2.0
messages = ['323446', '323448']
nosy_count = 1.0
nosy_names = ['pablogsal']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue34388'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7', 'Python 3.8']

[pablogsal]

collect_gdb fails for the test.pythoninfo step in several buildbots:

https://buildbot.python.org/all/#/builders/102/builds/55
https://buildbot.python.org/all/#/builders/79/builds/237
https://buildbot.python.org/all/#/builders/112/builds/161
https://buildbot.python.org/all/#/builders/118/builds/164
https://buildbot.python.org/all/#/builders/56/builds/105
https://buildbot.python.org/all/#/builders/18/builds/109

Example error:

./python -m test.pythoninfo
ERROR: collect_gdb() failed
Traceback (most recent call last):
  File "/usr/home/buildbot/python/2.7.koobs-freebsd-current.nondebug/build/Lib/test/pythoninfo.py", line 561, in collect_info
    collect_func(info_add)
  File "/usr/home/buildbot/python/2.7.koobs-freebsd-current.nondebug/build/Lib/test/pythoninfo.py", line 300, in collect_gdb
    version = version.splitlines()[0]
IndexError: list index out of range

[pablogsal]

The origin of this can be related to https://bugs.python.org/issue30871