free: invalid pointer on graph and photo.message imports

[hazcod]

BPO	44161
Nosy	@tiran, @hazcod

^{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 2021-05-17.21:31:00.118>
created_at = <Date 2021-05-17.21:12:30.485>
labels = ['library', '3.9', 'type-crash']
title = 'free: invalid pointer on graph and photo.message imports'
updated_at = <Date 2021-05-17.21:31:00.116>
user = 'https://github.com/hazcod'

bugs.python.org fields:

activity = <Date 2021-05-17.21:31:00.116>
actor = 'christian.heimes'
assignee = 'none'
closed = True
closed_date = <Date 2021-05-17.21:31:00.118>
closer = 'christian.heimes'
components = ['Library (Lib)']
creation = <Date 2021-05-17.21:12:30.485>
creator = 'hazcod'
dependencies = []
files = []
hgrepos = []
issue_num = 44161
keywords = []
message_count = 2.0
messages = ['393830', '393835']
nosy_count = 2.0
nosy_names = ['christian.heimes', 'hazcod']
pr_nums = []
priority = 'normal'
resolution = 'third party'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue44161'
versions = ['Python 3.9']

[hazcod]

Ref googleapis/python-pubsub#414 (comment)

@hazcod observed a fault when importing google.cloud.pubsub_v1 as above;

# strace python3 -c 'from google.cloud import pubsub_v1'
...
writev(2, [{iov_base="free(): invalid pointer", iov_len=23}, {iov_base="\n", iov_len=1}], 2free(): invalid pointer
) = 24
...
--- SIGABRT {si_signo=SIGABRT, si_code=SI_TKILL, si_pid=306, si_uid=0} ---
+++ killed by SIGABRT +++
Aborted
But importing google.cloud.pubsub_v1 isn't really required here; the fault can be reproduced with importing only these two dependencies...

python3 -c 'import proto.message, grpc;'
free(): invalid pointer
Aborted
Importing either by itself doesn't crash. Further, importing them in the other order doesn't crash. I do not understand why.

python3 -c 'import grpc, proto.message; print(grpc, proto.message)'
<module 'grpc' from '/usr/local/lib/python3.9/site-packages/grpc/init.py'> <module 'proto.message' from '/usr/local/lib/python3.9/site-packages/proto/message.py'>

[tiran]

google.cloud, proto.message, and grpc are third party extensions. They are neither part of CPython and nor maintained by us. Please report the issue with authors and maintainers of the library.