[issue43031] aarch64 RHEL7 LTO + PGO 3.7: "make" hangs when running test_asyncio

[STINNER Victor]

New submission from STINNER Victor <vstinner at python.org>:

test_asyncio hangs randomly on Python 3.7 on aarch64 RHEL7 LTO + PGO 3.7. The symptom is a failed build failing with:

   retry lost connection compile (retry)

Full error:

   remoteFailed: [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionLost'>: Connection to the other side was lost in a non-clean fashion.

Example of failed build:

   https://buildbot.python.org/all/#/builders/42/builds/4703

Configure command:

   ./configure --prefix '$(PWD)/target' --with-lto --enable-optimizations

Compile command:

   make -j10 all

End of the make output:
--------
make run_profile_task
make[1]: Entering directory `/home/buildbot/buildarea/3.7.cstratak-RHEL7-aarch64.lto-pgo/build'
./python -m test.regrtest --pgo || true
0:00:00 load avg: 1.07 Run tests sequentially
0:00:00 load avg: 1.07 [  1/416] test_grammar
(...)
0:01:40 load avg: 1.07 [ 24/416] test_asynchat
0:01:42 load avg: 1.07 [ 25/416] test_asyncio

remoteFailed: [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionLost'>: Connection to the other side was lost in a non-clean fashion.
]
--------

I ran manually "./configure --prefix '$(PWD)/target' --with-lto --enable-optimizations && make -j10 all" twice on the worker directly, but test_asyncio passed successfully (I tried it twice).

----------
components: Tests
messages: 385712
nosy: vstinner
priority: normal
severity: normal
status: open
title: aarch64 RHEL7 LTO + PGO 3.7: "make" hangs when running test_asyncio
versions: Python 3.7

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<https://bugs.python.org/issue43031>
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